JP2003258562A - Amplifier circuit with distortion compensation - Google Patents

Abstract

(57) [Problem] Unlike a conventional amplifier circuit with distortion compensation using a predistortion method, distortion can be suppressed without attenuating the level of a carrier component, and a larger distortion suppression amount can be obtained. Provided is an obtained amplifier circuit with distortion compensation. SOLUTION: Amplifiers 115 and 11 arranged in parallel are provided.
A balanced amplifying circuit is constructed in which 90 ° hybrids 114 and 117 are interposed before and after 6 and an original signal including a carrier component and the original signal are amplified by the amplifiers 115 and 116 in the 90 ° hybrid 114. Then, a distortion signal having an equal amplitude and a reverse phase (a phase difference of 180 °) is input to the distortion signal generated at that time, and the original signal and the distortion signal are differentially amplified with a phase difference of 90 °. Then, the directional coupler 118 combines the amplified original signal and the amplified distortion signal output from the 90 ° hybrid 117 to cancel the distortion components included in both signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifier circuit with distortion compensation, and more specifically, it is mainly used in a mobile communication base station such as a mobile phone, amplifies a signal, and a distortion generated at that time. The present invention relates to an amplifier circuit with distortion compensation capable of compensating for.

[0002]

2. Description of the Related Art In recent years, a transmitter of a base station of mobile communication equipment is required to have a highly efficient and highly linear power amplifier in order to collectively amplify a large number of signal channels.
In order to improve the linearity of the power amplifier, it is essential to adopt an amplifier circuit having a distortion compensation function.

FIG. 17 shows a configuration example of a conventional amplifier circuit with distortion compensation. In FIG. 17, the conventional amplifier circuit with distortion compensation has an input terminal 601, an output terminal 602, a power distributor 603, a delay circuit 604, a distortion generation circuit 605, a variable attenuator 606, a variable phase shifter 607, a power combiner 608, Power amplifier 609, directional coupler 610 and control unit 61
1 is provided.

In the distortion-compensated amplifier circuit configured as described above, the carrier signal input from the input terminal 601 is split into two by the power distributor 603. The distortion generation circuit 605 generates a distortion signal based on one of the two carrier signals. This distorted signal is transmitted to the variable attenuator 606.
And, after being subjected to the adjustment of the amplitude and the phase by the variable phase shifter 607, it is given to the power combiner 608. Power distributor 60
The other carrier signal, which has been divided into two by 3, is delayed by the delay circuit 60.
After being delayed by 4, the power is input to the power combiner 608. The power combiner 608 combines the distortion signal and the carrier signal and inputs the combined signal to the power amplifier 609. The power amplifier 609 amplifies the input signal and outputs it to the output terminal 602.
Output through.

A directional coupler 610 is provided between the power amplifier 609 and the output terminal 602, where a part of the output signal of the power amplifier 609 is branched and the control unit 6 is provided.
Given to 11. The control unit 611 controls the power combiner 608.
The variable attenuator 606 and the variable attenuator 606 have the same amplitude and opposite phase as the intermodulation distortion (hereinafter, simply referred to as “distortion”) generated when the power amplifier 609 amplifies the carrier signal. The variable phase shifter 607 is controlled.

As described above, in the amplifier circuit with distortion compensation shown in FIG. 17, a distortion signal having the same amplitude and opposite phase as the distortion that would occur when the power amplifier 609 amplifies the carrier signal is generated, and the distortion signal is generated. Is added to the carrier signal to be input to the power amplifier 609 in advance (that is, a distortion component having the same amplitude and opposite phase as the generated distortion is injected into the input side of the amplifier), so that the distortion generated in the power amplifier 609 is generated. Is being reduced. Such distortion compensation is called a pre-distortion method and is disclosed in Patent Document 1, for example.

[0007]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2000-261252

[0008]

However, as shown in FIG.
The conventional distortion-compensated amplifier circuit based on the predistortion method as shown in FIG. 1 has the following problems. The distortion signal input from the distortion generation circuit 605 through the variable attenuator 606 and the variable phase shifter 607 to the power amplifier 609 includes a carrier component in addition to the distortion component, and this carrier component is also a distortion component. The variable attenuator 606 and the variable phase shifter 607 together undergo the adjustment of the amplitude and the phase. Therefore, the power combiner 608
A carrier component having a phase opposite to that of the carrier signal inputted through the delay circuit 604 is inputted to
A part of the carrier signal is canceled by the carrier component of the opposite phase, and the carrier level is attenuated. When the carrier level is attenuated in this way, it becomes necessary to add an additional amplifier for compensating for the power loss in order to satisfy the desired level diagram.

In addition, in the circuit as shown in FIG. 17, in the power amplifier 609, the injection distortion component is amplified and the distortion is suppressed simultaneously, so that it is actually difficult to obtain a large distortion suppression amount. There is also a problem.

The present invention has been made to solve the above problems, and its purpose is to reduce the level of a carrier component, unlike a conventional distortion-compensated amplifier circuit using a predistortion method. It is an object of the present invention to provide an amplifier circuit with distortion compensation that can suppress distortion without a distortion and can obtain a larger amount of distortion suppression as compared with a conventional amplifier circuit with distortion compensation that uses a predistortion method.

[0011]

Means for Solving the Problems and Effects of the Invention The first invention is an amplifier circuit with distortion compensation for amplifying a signal and compensating for distortion occurring when the signal is amplified.
Two amplifying means arranged in parallel with each other, each amplifying a signal, an original signal containing a carrier component, and the same frequency as the distortion frequency generated when the original signal is amplified by each amplifying means. The first distortion signal and are input,
The original signal and the first distortion signal are combined and then divided into two, and the first combining / distributing means for outputting to the two amplifying means and the two signals output from the two amplifying means are combined. The second combining / distributing means for dividing into two and the combining means for combining and outputting the two signals output from the second combining / distributing means, and the first and second combining / dividing means each divide into two. It is characterized in that it is a hybrid that outputs the two signals obtained by adding a predetermined phase difference.

In the first aspect of the present invention, the two amplifying means arranged in parallel with each other are constructed in a balanced type so as to be contained in the first and second hybrids. When the original signal and the distorted signal are input to the first hybrid, the second hybrid
From the hybrid of, a signal including only a distortion component whose phase is delayed from the input distortion signal, a signal including a carrier component whose phase is delayed from the input original signal, and a distortion component whose phase is advanced from the input distortion signal. Is output. When these two signals are combined, the distortion components contained in each signal are out of phase with each other, so at least part of them are canceled out,
As a result, the distortion included in the combined signal is suppressed (the effect of suppressing distortion by the post-distortion method). And in this case, the carrier component is
Since they are included in only one of the two signals, they do not cancel out, so that no carrier level attenuation occurs.

The effect of suppressing the distortion by the post-distortion method as described above is further improved as the distortion components in the two signals output from the second hybrid are closer to the opposite phase (phase difference 180 °). The closer it is to the equal amplitude, the larger the amplitude becomes, and the maximum when the amplitude and the opposite phase are the same. Therefore, when a 90 ° hybrid is used as in the following fourth invention, the distortion signal input to the first hybrid has a phase of 1 with respect to the distortion generated in the amplifying means.
It is preferable that they are deviated from each other by 80 °, and most preferably the amplitude is equal to the distortion generated in the amplifying means, as in the sixth invention described below.

That is, as described above, when the phase of the distortion signal input to the first hybrid is shifted by 180 ° with respect to the phase of the distortion generated by the amplifying means, it is generated in each amplifying means with the input distortion signal. The distortion has a phase difference of 90 ° and does not interfere with each other. Therefore, from the second hybrid, a signal including only a distortion component whose phase is delayed by 90 ° with respect to the first distortion signal input to the first hybrid and an original signal input to the first hybrid. A signal including two components, a carrier component whose phase is delayed by 90 ° from the signal and a distortion component whose phase is advanced by 90 ° from the first distortion signal input to the first hybrid, is output. To be done. Then, when these two signals are combined, the distortion components having opposite phases are
If the amplitudes are the same, they cancel each other out.

In addition, as in the first aspect of the present invention, the original signal and the distorted signal are amplified with a phase difference (that is, differential amplification) through an amplifier in which two amplifying means are hybrid and balanced. When performing distortion suppression by the post-distortion method that combines the amplified original signal and the amplified distortion signal, it is necessary to separately perform amplification of the distortion signal and suppression of distortion that occurs when the original signal is amplified. Therefore, it is possible to obtain a larger amount of distortion suppression as compared with the conventional amplifier circuit with distortion compensation using the predistortion method.

Furthermore, since the signal containing only the distortion component is output from the second hybrid, as in the following seventh or twelfth invention, the signal is input to the first hybrid based on the power of the signal. It is possible to easily control the amplitude and phase of the distortion signal to be generated.

A second aspect of the present invention further comprises signal input means for inputting the original signal and the first distortion signal to the first combining / distributing means.

In the second aspect of the invention, the signal input means inputs the original signal and the first distortion signal as described above to the first combining / distributing means.

In a third aspect based on the second aspect, the signal input means adjusts each phase of the original signal and / or the first distorted signal to be input to the first combining / distributing means. including.

In the third aspect of the invention, the phase adjusting means adjusts each phase of the original signal and / or the first distortion signal.

A fourth invention is the first invention in the third invention.
And the second combining / distributing means each have 9 signals for the two signals.
It is a 90 ° hybrid that outputs with a phase difference of 0 °, and the phase adjusting means is provided when the first distortion signal to be input to the first combining / distributing means is amplified by each amplifying means. Each of the phases of the original signal and the first distorted signal is adjusted so as to have a phase difference of 180 ° with respect to the distortion that occurs.

According to the fourth aspect, since the distortion components in the two signals output from the second hybrid have opposite phases, a high distortion suppressing effect can be obtained.

In a fifth aspect based on the fourth aspect, the signal input means further includes amplitude adjusting means for adjusting the amplitude of the first distortion signal to be input to the first combining / distributing means.

In the fifth invention, the amplitude adjusting means is the first.
Adjust the amplitude of the distortion signal.

In a sixth aspect based on the fifth aspect, the amplitude adjusting means amplifies the amplitude of the first distorted signal to be inputted to the first combining / distributing means by each amplifying means to amplify the original signal. The feature is that the amplitude is adjusted to be equal to the amplitude of the distortion that occurs.

According to the sixth aspect, since the distortion components in the two signals output from the second hybrid have opposite phases and equal amplitudes, the highest distortion suppression effect can be obtained.

A seventh invention is the second invention in the sixth invention.
From the synthesizing / distributing means, the signal including only the distortion component whose phase is delayed by 90 ° from the first distortion signal input to the first synthesizing / distributing means, and the original signal input to the first synthesizing / distributing means. Carrier component whose phase is delayed by 90 ° from the first, and the first
And a signal including two components of a distortion component whose phase is advanced by 90 ° with respect to the first distortion signal input to the combining / distributing means, and the signal input means is based on the power of the signal including only the distortion component. And further includes control means for controlling the phase adjustment means and the amplitude adjustment means.

In the seventh aspect of the invention, the control means detects the power of one of the signals (the signal containing only the distortion component) output from the second hybrid, and the phase adjustment means and the amplitude adjustment are performed based on the detection result. Control means. This allows
Even if the amplitude or phase of the distortion generated in the amplifying means changes due to a change in the environmental temperature or the like, it is possible to follow the fluctuation, so that a high distortion suppressing effect can be maintained.

In an eighth aspect based on the second aspect, the signal input means divides the original signal into two, and the first distortion signal based on one original signal obtained by dividing the original signal into two. And a first distortion generating means for generating.

In the eighth invention, the original signal is divided into two,
The first distortion signal is generated based on one of the original signals. The other original signal and the first distortion signal are input to the first combining / distributing means.

In a ninth aspect based on the second aspect, the signal inputting means has the same frequency with respect to the original signal as distortion generated when the original signal is amplified by each amplifying means.
Distortion adding means for adding the distortion component of.

In the ninth aspect, the distortion adding means adds the second distortion component to the original signal. The original signal to which the second distortion component is added and the distortion signal including the first distortion component are input to the first hybrid. The first hybrid divides the distortion signal including the first distortion component and the original signal to which the second distortion component is added into two, and inputs the signals with a phase difference of 90 ° to each amplifier. . In each amplification means, when amplifying the original signal to which the second distortion component is added, distortion is suppressed by predistortion.
As a result, the amount of generated distortion is smaller than that in the case where the second distortion component is not added. As a result, in addition to the distortion suppression by the post-distortion being performed by the combining means, the distortion suppression by the pre-distortion is performed by each amplifying means, and a higher distortion suppression effect can be obtained.

Since distortion is suppressed by combining predistortion and postdistortion,
The level of the first distortion signal that contributes to post-distortion can be made smaller compared to the case where distortion is suppressed only by post-distortion, and as a result, an effect equivalent to reducing the amount of carrier component attenuation is obtained. To be

In a tenth aspect based on the ninth aspect, the signal inputting means includes the original signal to which the second distortion component to be input to the first combining / distributing means is added and / or the first signal.
Phase adjustment means for adjusting the respective phases of the distortion signals of the.

In the tenth invention, the phase adjusting means is
Each phase of the original signal with the second distortion added and / or the first distortion signal is adjusted.

An eleventh invention is the tenth invention, wherein
The first and second combining and distributing means are 90-degree hybrids that output two signals with a phase difference of 90 degrees, and the phase adjusting means includes the first combining and distributing means for inputting to the first combining and distributing means. Of the original signal and the first signal so that each of the distortion signals has a phase difference of 180 ° with respect to the distortion generated when the original signal to which the second distortion component is added is amplified by each amplification means. It is characterized in that each phase of the distortion signal is adjusted.

According to the eleventh aspect, since the distortion components in the two signals output from the second hybrid have opposite phases, a high distortion suppressing effect can be obtained.

A twelfth invention is the tenth invention, wherein
The signal input means further includes amplitude adjusting means for adjusting the amplitude of the first distortion signal to be input to the first combining / distributing means.

In the twelfth aspect of the invention, the amplitude adjusting means adjusts the amplitude of the first distortion signal.

A thirteenth invention is the twelfth invention, wherein
The amplitude adjusting means adjusts the amplitude of the first distortion signal to be equal to the amplitude of distortion generated when the original signal to which the second distortion component is added is amplified by each amplifying means. And

In the thirteenth aspect of the invention, since the distortion components in the two signals output from the second hybrid have opposite phases and equal amplitudes, the highest distortion suppressing effect can be obtained.

A fourteenth invention is the thirteenth invention, wherein
From the second combining / distributing means, a signal containing only a distortion component whose phase is delayed by 90 ° with respect to the first distortion signal inputted to the first combining / distributing means, and inputted to the first combining / distributing means. A signal including two components, a carrier component whose phase is delayed by 90 ° with respect to the original signal and a distortion component whose phase is advanced by 90 ° with respect to the first distortion signal input to the first combining / distributing means, is output. The signal input means further includes control means for controlling the phase adjusting means and the amplitude adjusting means based on the power of the signal containing only the distortion component.

In the fourteenth invention, the control means is the second
The power of one of the signals (the signal containing only the distortion component) output from the hybrid No. 2 is detected, and the phase adjusting unit and the amplitude adjusting unit are controlled based on the detection result. Thus, even if the amplitude or phase of the distortion generated in the amplifying means changes due to a change in environmental temperature or the like, it is possible to follow the change, so that a high distortion suppressing effect can be maintained.

In a fifteenth aspect based on the ninth aspect, the signal input means further includes an amplitude adjusting means for adjusting the amplitude of the first distortion signal to be input to the first combining / distributing means.

In the fifteenth aspect of the invention, the amplitude adjusting means adjusts the amplitude of the first distortion signal.

A sixteenth invention is the fifteenth invention, wherein
The amplitude adjusting means adjusts the amplitude of the first distortion signal to be equal to the amplitude of distortion generated when the original signal to which the second distortion component is added is amplified by each amplifying means. And

In the sixteenth invention, since the distortion components in the two signals output from the second hybrid have the same amplitude, a high distortion suppressing effect can be obtained.

A seventeenth invention is the sixteenth invention, wherein
From the second combining / distributing means, a signal containing only a distortion component whose phase is delayed by 90 ° with respect to the first distortion signal inputted to the first combining / distributing means, and inputted to the first combining / distributing means. A signal including two components, a carrier component whose phase is delayed by 90 ° with respect to the original signal and a distortion component whose phase is advanced by 90 ° with respect to the first distortion signal input to the first combining / distributing means, is output. The signal input means further includes control means for controlling the phase adjusting means and the amplitude adjusting means based on the power of the signal containing only the distortion component.

In the seventeenth aspect, the control means is the second aspect.
The power of one of the signals (the signal containing only the distortion component) output from the hybrid No. 2 is detected, and the phase adjusting unit and the amplitude adjusting unit are controlled based on the detection result. Thus, even if the amplitude or phase of the distortion generated in the amplifying means changes due to a change in environmental temperature or the like, it is possible to follow the change, so that a high distortion suppressing effect can be maintained.

In an eighteenth aspect based on the ninth aspect, the signal input means further includes a dividing means for dividing the original signal into two parts, and one of the original signals obtained by dividing the original signal into two parts. A first distortion generating means for generating a distortion signal, and the distortion adding means generates a second distortion component based on the other original signal obtained by dividing into two, and the other original signal. It is characterized by being added to.

In the eighteenth aspect, the original signal is divided into two, and the first distortion signal is generated based on one original signal. Also, a second distortion component is generated based on the other original signal, and the generated second distortion component is added to the other original signal. The first distortion signal and the other original signal to which the second distortion is added are input to the first combining / distributing means.

In a nineteenth aspect based on the ninth aspect, the signal inputting means further comprises a first dividing means for dividing the original signal into two and one of the first dividing means obtained by dividing the original signal into two. A first distortion generating means for generating a first distortion signal based on the original signal; and a second distributing means for distributing the first distortion signal generated by the first distortion generating means into two. The distortion adding means is the first one obtained by dividing the second distributing means into two.
It is characterized in that the distorted signal is added as the second distorted component to the other original signal obtained by being distributed by the first distributing means.

In the nineteenth aspect of the invention, the original signal is divided into two, and the first distortion signal is generated based on one of them. Furthermore, the first distortion signal is divided into two, and one of them is added as the second distortion to the other original signal. The first distortion signal and the other original signal to which the second distortion is added are input to the first combining / distributing means.

The twentieth, twenty-second, twenty-fourth and twenty-sixth inventions respectively correspond to the amplifier circuits with distortion compensation described in the first to fourth embodiments.

The inventions of 21, 23, 25 and 27 are second
In the inventions of 0, 22, 24 and 26, a control means for controlling the vector adjusting means based on one signal output from the second power combining and distributing means is added.

The twenty-eighth to thirty-first inventions are,
This is a feedforward type amplifier using the invention of either 24 or 26 as a main amplifier.

[0057]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals are given to the same components throughout all the embodiments and all the drawings. Below, 1st-5th
5 embodiments will be described. Before giving a detailed description, an outline of each embodiment will be described.

The first to fourth embodiments are all related to the amplifier circuit with distortion compensation, and the fifth embodiment is the first to fourth embodiments.
The present invention relates to a feedforward amplifier using the amplifier circuit according to any one of the above embodiments as a main amplifier. First to
The relationship between the fourth embodiments is as follows.

In the first embodiment, two amplifiers (115 and 116) arranged in parallel with each other are arranged in front of and behind the first amplifier.
And a second 90 ° hybrid (114 and 11
In the balanced type amplification circuit as in 7), an original signal containing a carrier component in the first 90 ° hybrid (114) and the original signal are supplied to the respective amplifiers (115, 116).
A distortion signal having an equal amplitude and an opposite phase (that is, a phase difference of 180 °) with respect to the distortion generated when being amplified by is input, and the original signal and the distortion signal have a phase difference of 90 °. And add differential amplification. Then, the amplified original signal and the amplified distortion signal output from the second 90 ° hybrid (117) are combined by the directional coupler (118), so that the distortion components included in both signals are combined. Is canceled (that is, distortion is suppressed by the post-distortion method).

The second to fourth embodiments add a distortion component to the original signal to be input to the first 90 ° hybrid (114) in the first embodiment (thus, the first 90 ° hybrid). The original signal including the carrier component and the distortion component and the distortion signal are input to the hybrid 114) so that not only the distortion suppression by the post-distortion method but also the distortion suppression by the pre-distortion method is performed. Has been done. The difference between the second to fourth embodiments is that a circuit part for generating an original signal and a distortion signal containing the carrier component and the distortion component as described above and inputting them to the first 90 ° hybrid (114). This circuit part is called a signal input part (100).

(First Embodiment) FIG. 1 shows the first embodiment of the present invention.
3 is a block diagram showing the configuration of an amplifier circuit with distortion compensation according to the embodiment of FIG. In FIG. 1, the amplifier circuit with distortion compensation includes a signal input unit 100, an output terminal 102, 90 ° hybrids 114 and 117, and a power amplifier 115.
And 116 and a directional coupler 118. The signal input unit 100 includes an input terminal 101 and a directional coupler 11.
9 and 120, a power distributor 103, a distortion generating circuit 111, a variable attenuator 112, a variable phase shifter 113,
The delay circuit 104 and the control unit 141 are included.

The control unit 141 includes a power distributor 1411,
The first filter 1412 and the second filter 1413
And a first power detector 1414 and a second power detector 1
415, a first control circuit 1416, a second control circuit 1417, and a third power detector 1418.

The distortion generator circuit 111 includes a power distributor 105.
A delay circuit 106, a distortion generating element 107, a variable attenuator 108, a variable phase shifter 109, and a power combiner 110.
Have and. The distortion generator circuit 111 generates a distortion signal containing only the distortion component based on the original signal containing only the carrier component.

Distortion generating element 107 and power amplifier 1
For example, transistors such as a field effect transistor (FET) are used for 15 and 116, and the power amplifier 11
5 and 116 have the same characteristics. Further, for the delay circuits 104 and 106, for example, a coaxial cable such as a semi-rigid cable is used.

In FIG. 1, the input terminal 101 is connected to the input of the directional coupler 120, and one end of the output of the directional coupler 120 is connected to the input of the power distributor 103.
One end of the output of the power distributor 103 is connected to the first input terminal of the 90 ° hybrid 114 via the delay circuit 104. On the other hand, the other end of the output of the power distributor 103 is connected to the input of the power distributor 105. One end of the output of the power distributor 105 is connected to the power combiner 11 via the delay circuit 106.
Connected to one end of 0 input. On the other hand, the power distributor 105
The other end of the output of the
8 and variable phase shifter 109, power combiner 110
Connected to the other end of the input.

The output of the power combiner 110 is the variable attenuator 1
12 and the variable phase shifter 113, and is connected to the second input terminal of the 90 ° hybrid 114. The first output terminal of the 90 ° hybrid 114 is the power amplifier 115.
Through 90 ° hybrid 117 to the first input terminal. On the other hand, the second 90 degree hybrid 114
Is connected to the second input terminal of the 90 ° hybrid 117 via the power amplifier 116.

The first output terminal of the 90 ° hybrid 117 is connected to the directional coupler 11 via the directional coupler 119.
8 connecting terminals. 90 ° hybrid 117
The second output terminal of is connected to the output terminal 102 via the directional coupler 118. The power distributor 1411 is connected to the coupling terminal of the directional coupler 119. The first filter 141 is connected to one output terminal of the power distributor 1411.
2, first power detector 1414 and first control circuit 1
416 is connected. The output signal from the first control circuit 1416 is input to the variable attenuator 108 and the variable phase shifter 109. The second filter 1413, the second power detector 1415, and the second control circuit 1417 are connected to the other terminal of the power distributor 1411. Furthermore, the second
The control circuit 1417 is connected to the coupling terminal of the directional coupler 120 via the third power detector 1418.
The output signal from the second control circuit 1417 is input to the variable attenuator 112 and the variable phase shifter 113.

The operation of the amplifier circuit with distortion compensation constructed as above will be described below with reference to FIGS. 2 to 6 are frequency spectra of signals at respective terminals of the circuit of FIG. 1 and phases of those signals. Here, consider a case where two sine waves (carriers) of frequencies f1 and f2 are input to the input terminal 101. This terminal is called terminal a, and its spectrum is shown in FIG.

A part of the signal input to the input terminal 101 is extracted by the directional coupler 120, input to the third power detector 1418, and part of the signal is input to the power distributor 103 and split into two. . One of the two divided output signals passes through the delay circuit 104 and the first output of the 90 ° hybrid 114.
Input to the input terminal of. This terminal is called terminal b, and its spectrum is shown in FIG. The spectrum at the terminal b is only the carrier component (f1 and f2) as in the case of the terminal a.

On the other hand, the other output signal of the power distributor 103 is further divided into two by the power distributor 105, and one of the output signals is input to one end of the input of the power combiner 110 through the delay circuit 106. . This terminal is designated as terminal c, and its spectrum is shown in FIG. The spectrum at the terminal c is only the carrier component (f1 and f2) as in the case of the terminal a.

On the other hand, the other output signal of the power distributor 105 is input to the distortion generating element 107. Therefore, intermodulation distortion (IM3) components f3 and f4 are generated, and a signal including the intermodulation distortion components f3 and f4 is output from the output side of the distortion generating element 107. The output signal has its amplitude and phase adjusted by the variable attenuator 108 and the variable phase shifter 109, and is input to the other end of the power combiner 110 on the input side. This terminal is designated as terminal d, and its spectrum is shown in FIG. At this time, the variable attenuator 108 adjusts the amplitude according to the control voltage from the first control circuit 1416. The variable phase shifter 109 adjusts the phase according to the control voltage from the first control circuit 1416. The operation of the first control circuit 1416 will be described later in detail.

At this time, the first control circuit 1416 adjusts the signals of the frequencies f1 and f2 at the terminal c and the signals of the frequencies f1 and f2 at the terminal d to have the same amplitude and opposite phase. As a result, the carrier component f
1 and f2 are suppressed, and only the intermodulation distortion components f3 and f4 are output from the output side of the power combiner 110. The signal is a variable attenuator 112 and a variable phase shifter 1
Amplitude and phase are adjusted at 13, and 90 ° hybrid 1
It is input to the second input terminal of 14. That terminal to terminal e
And the signal spectrum is shown in FIG. At this time, the variable attenuator 112 adjusts the amplitude according to the control voltage from the second control circuit 1417. Variable phase shifter 11
3 adjusts the phase according to the control voltage from the second control circuit 1417. The operation of the second control circuit 1417 will be described later in detail. As described above, since only the distortion component is input to the terminal e, it can be seen that the portion indicated by the dotted line 111 in FIG. 1 functions as a distortion generation circuit.

As shown in FIGS. 2B and 2E, when the phases of the carrier components f1 and f2 input to the terminal b are 0 ° (reference phase), the second control circuit 1417 is used.
Represents the phase of the IM3 component input to the terminal e by α + 180
The variable phase shifter 113 is adjusted so that the angle becomes °. Note that α shown here is the intermodulation distortion (IM3) component f3 that occurs when two sine waves (carriers) of frequencies f1 and f2 are input to the power amplifier 115 (or 116).
And f4 are relative phases with respect to the carrier. The relative phase with respect to the carrier described here is 2 carriers f
It is defined as the phase of intermodulation distortion (IM3) components f3 and f4 with respect to the carrier at the moment when the instantaneous phases of 1 and f2 are the same.

The signals input to the terminals b and e appear at the inputs of the power amplifiers 115 and 116 via the 90 ° hybrid 114, respectively. The input of the power amplifier 115 is a terminal f, the input of the power amplifier 116 is a terminal g, and its signal spectrum and carrier component are
The phases of the IM3 component are shown in FIGS. 3 (a) and 3 (b), respectively. As shown in FIG. 3A, the terminal f has
Carrier component of phase 0 ° and IM3 of phase α + 270 °
A composite signal with the component appears, and on the other hand, as shown in FIG. 3B, a carrier component with a phase of 90 ° and a phase α
A combined signal with the + 180 ° IM3 component appears.

The signal appearing at the terminal f is the power amplifier 115.
The signal that is amplified by and appears at the terminal h and that appears at the terminal g is amplified by the power amplifier 116 and appears at the terminal i. The spectra of the signals appearing at the terminals h and i and the phases of the carrier component and IM3 component are respectively shown in FIG.
It shows in (d). As shown in FIG. 3C, the terminal h is
IM of the phase α generated when the carrier component of the phase 0 ° and the carrier component input to the power amplifier 115 are amplified.
3 components and I of phase α + 270 ° input from terminal f
A composite signal with the M3 component appears.

Similarly, at the terminal i, as shown in FIG. 3D, a carrier component having a phase of 90 ° and a power amplifier 116 are provided.
A composite signal of the IM3 component of phase α + 90 ° generated when amplifying the carrier component input to and the IM3 component of phase α + 180 ° input from the terminal g appears.

The signal appearing at the terminal h is input to the first input terminal of the 90 ° hybrid 117, and the signal appearing at the terminal i is input to the second input terminal of the 90 ° hybrid 117. As a result, at the terminal j, which is the first output terminal of the 90 ° hybrid 117, the signal at the terminal h and the signal whose phase is delayed by 90 ° with respect to the signal at the terminal i are combined, as shown in FIG. A signal appears, and as a result, the carrier components cancel each other out, and only the IM3 component of the phase α + 270 ° appears.

On the other hand, the terminal k which is the second output terminal of the 90 ° hybrid 117 is connected to the terminal h as shown in FIG.
A signal in which the phase is delayed by 90 ° with respect to the signal of (1) and a signal at the terminal i appear, and as a result, a carrier component of phase 90 ° and an IM3 component of phase α + 90 ° appear. The signal at the terminal j and the signal at the terminal k are combined by the directional coupler 118, but the IM3 components of both are canceled by the output of the directional coupler 118 because the phase difference is 180 °, and as a result, the output is made. Only the carrier component is output to the terminal 102 (terminal m) as shown in FIG.

A part of the signal at the terminal j is extracted by the directional coupler 119 and input to the power distributor 1411. The power distributor 1411 divides an input signal into two parts, and the first filter 1412 and the second filter 14 are separated.
Enter in 13. The first filter 1412 passes only the carrier components (frequency f1 and f2) and inputs them to the first power detector 1414. First power detector 141
4 detects the carrier component power, outputs a voltage corresponding to it, and inputs it to the first control circuit 1416. The first control circuit 1416 outputs a control voltage for controlling the variable attenuator 108 and the variable phase shifter 109 so that the carrier component power detected by the first power detector 1414 is minimized.

The second filter 1413 passes only the distortion component (frequency f3 and f4) and inputs it to the second power detector 1415. The second power detector 1415 detects the distortion component power and outputs a voltage corresponding to the detected distortion component power.
Input to the control circuit 1417. On the other hand, a part of the signal at the terminal a is extracted by the directional coupler 120 and input to the third power detector 1418. Third power detector 14
18 detects the power of the carrier component and inputs a voltage corresponding to it to the second control circuit 1417. The second control circuit 1417 stores in advance the optimum voltage level to be detected by the second power detector 1415 with respect to the power level detected by the third power detector 1418. Second
The control circuit 1417 refers to the power level from the third power detector 1418 and sets the variable attenuator 112 and the variable phase adjuster so that the power level from the second power detector 1415 becomes a set value. The control voltage for controlling the device 113 is output.

FIG. 7 is a flow chart showing an example of the operation of the first control circuit 1416. The operation of the first control circuit 1416 will be described below with reference to FIG. 7. As a premise, the first control circuit 1416 has
Threshold of carrier component power detected by first power detector 1414, variable attenuator 108, and variable phase shifter 109
It is assumed that the initial value of the control voltage is stored in advance.

First, the first control circuit 1416 compares the carrier component power detected by the first power detector 1414 with the stored threshold value (step S10).
1). If the carrier component power is greater than or equal to the threshold value, the first control circuit 1416 proceeds to operation at step S106.
On the other hand, if the carrier component power is less than the threshold,
The first control circuit 1416 changes the control voltage of the variable phase shifter 109 in a predetermined direction (step S102) and compares the carrier component power with a threshold value (step S10).
3).

When the carrier component power is above the threshold value,
The first control circuit 1416 proceeds to the operation of step S106. On the other hand, when the carrier component power is smaller than the threshold value, the first control circuit 1416 changes the control voltage of the variable attenuator 108 in a predetermined direction (step S10).
4) The carrier component power is compared with the threshold value (step S105).

When the carrier component power is above the threshold value,
The first control circuit 1416 proceeds to the operation of step S106. On the other hand, when the carrier component power is smaller than the threshold value, the first control circuit 1416 returns to the operation of step S102.

In step S 106, the first control circuit 1416 controls the variable attenuator 108 and the variable phase shifter 10.
The control voltage of 9 is fixed without being changed, and the process ends.

Next, the operation of the second control circuit 1417 will be described. The second control circuit 1417 controls the power level of the distortion component detected by the second power detector 1415 and the third power circuit.
The power level of the carrier component detected by the power detector 1418 is compared. The second control circuit 1417 has a third
The optimum power level of the distortion component to be detected by the second power detector 1415 is stored in advance according to the power level of the carrier component detected by the power detector. The optimum distortion component power level stored in this way is
The second control circuit 1417 includes a variable attenuator 112 and a variable phase shifter 11 as detected by the power detector 1415 of FIG.
It outputs a control voltage for controlling 3. The procedure for outputting this control voltage is the same as in the case of the first control circuit 1416, and FIG. 7 is used as a flowchart. The different points are steps S101, S103, S1.
In 05, the second control circuit 1417 only compares the power level of the optimum distortion component with the power level actually detected by the second power detector 1415.

By doing so, the combined loss in the power combiner 608, which has occurred in the conventional technique shown in FIG. 17, does not occur in the present embodiment. Therefore, an amplifier that compensates the gain of the loss is provided. It is not necessary to dispose, and as a result, it is possible to reduce the size and cost.

Consider, for example, the case where electric power of Po [dBm] is output from the output terminal 102 of FIG. 1 and the output terminal 602 of FIG. The power amplifiers 115 and 1 of FIG.
16, and the gain of the power amplifier 609 of FIG.
B] and the distribution ratio of the power distributor 103 of FIG. 1 and the power distributor 603 of FIG. 17 is 1: 1 (-3 dB each), the input power to the input terminal is the conventional technique shown in FIG. Is Po-G + 6 [dBm], whereas in the present embodiment it is Po-G + 3 [dBm], and the input power can be reduced by 3 dB.

In addition, by amplifying the carrier component and the injection distortion component with a 90 ° phase difference using a 90 ° hybrid, amplification of the distortion component and distortion suppression can be performed independently. Therefore, a large amount of distortion suppression can be realized, and the circuit adjustment becomes easy.

Further, since the present embodiment has a circuit configuration in which distortion is suppressed in the directional coupler 118 arranged in the subsequent stage of the power amplifier, only the distortion component is easily extracted by the directional coupler 119, It can be used for control.

In the present embodiment, the two power distributors 103 and 105 are used.
It is also possible to replace it with three triple distributors.

In the present embodiment, the strain generating element 1
Although FETs are used for 07 and power amplifiers 115 and 116, bipolar transistors can be used for both. Also, the power amplifiers 115 and 116
While the FET is used for the strain generator, a diode can be used for the strain generating element 107. In any case, the same effect as this embodiment can be obtained.

In this embodiment, the delay circuit 104
Although a coaxial cable such as a semi-rigid cable is used for and 106, it is also possible to form this using another transmission line such as a microstrip line,
Alternatively, a delay filter can be used. Further, not only the delay circuit whose propagation delay time is fixed as used in the present embodiment but also a delay circuit whose delay time can be changed like a variable delay filter can be used.

In this embodiment, the variable attenuators 108 and 112 and the variable phase shifters 109 and 113 are controlled using the signal appearing at the first output terminal (terminal j) of the 90 ° hybrid 117. However, it is also possible to perform this control using a signal to the input terminal 101 and a signal appearing at the output terminal 102.

The operation of the first control circuit 1416 is as follows.
The operation is not limited to that shown in FIG. 7. FIG. 8 is a flowchart showing another operation example of the first control circuit 1416. Hereinafter, another operation example of the first control circuit 1416 will be described with reference to FIG. As a premise,
It is assumed that the initial values of the control voltages of the variable attenuator 108 and the variable phase shifter 109 are previously stored in the first control circuit 1416.

First, the first control circuit 1416 detects the voltage value corresponding to the carrier component power from the first power detector 1414 (step S201). Next, the first control circuit 1416 changes the control voltage of the variable phase shifter 109 in a predetermined direction (step S202), and compares the carrier component power after the change with the carrier component power before the change (step S203). ). When the carrier component power after the change is larger, the first control circuit 1416 causes the variable phase shifter 10 to move in the direction opposite to the direction changed in step S201.
The control voltage of No. 9 is changed (step S204), and the operation proceeds to step S206. On the other hand, if the carrier component power after the change is less than or equal to the carrier component power before the change, the first
The control circuit 1416 changes the control voltage of the variable phase shifter 109 in the same direction as the direction changed in step S201 (step S205), and proceeds to the operation of step S206.

In the operation of step S206, the first control circuit 1416 causes the first control circuit 1416 to perform step S204 or S205.
The carrier power before the control voltage is changed and the carrier power after the change are compared by the operation of, and it is determined whether or not the magnitude relationship between before and after the change is reversed (step S20).
6). If the magnitude relationship is not reversed, the first control circuit 1416 returns to the operation of step S202. On the other hand, when the magnitude relationship is reversed, the first control circuit 1416
Performs the same operation as steps S202 to S206, changes the control voltage of the variable attenuator 108 (step S207), and returns to the operation of step S201. Thus, a method of sequentially adjusting the control voltage without determining the threshold value may be used.

(Second Embodiment) FIG. 9 shows a second embodiment of the present invention.
3 is a block diagram showing the configuration of an amplifier circuit with distortion compensation according to the embodiment of FIG. 9, the same components as those in the first embodiment are designated by the same reference numerals as those in FIG. Only the points different from the first embodiment will be described below.

In the first embodiment, one end of the output of the power distributor 103 is input to the first input terminal (terminal b) of the 90 ° hybrid 114 via the delay circuit 104. In the form, one end of the output of the power distributor 103 is input to the distortion generation circuit 124, and the distortion generation circuit 12 is input.
The output of No. 4 is input to the first input terminal (terminal b) of the 90 ° hybrid 114 via the delay circuit 104.

The distortion generating circuit 124 includes a distortion generating element 121, a variable attenuator 122 and a variable phase shifter 123.
Are connected in series. The strain generating element 121 includes, for example, a field effect transistor (FET).
Such a transistor is used. For example, input terminal 10
When two sine waves (carriers) f1 and f2 are input to 1, the two carriers are input to the distortion generating element 121. Therefore, in addition to f1 and f2, the IM3 component f3 is added to the output of the distortion generating element 121. And f4 appear.

That is, the distortion generator circuit 124 generates a distortion component based on the original signal containing the carrier component, adds the distortion component to the original signal, and outputs the original signal. Therefore, 9
A signal containing a carrier component and a distortion component and a signal containing only the distortion component are input to the 0 ° hybrid 114.

FIG. 6 and FIGS. 10 to 13 show the signal spectra of the terminals (terminals a to k and m shown in FIG. 9) of the amplifier circuit with distortion compensation in the present embodiment. The operation of the amplifier circuit with distortion compensation of the present embodiment will be described using these. 10 (a), (c), (d) and (e)
The signal spectra at terminals a, c, d and e shown in FIG. 10 are the same as those in the first embodiment, but FIG.
The signal spectrum at the terminal b shown in (b) includes not only the carrier components f1 and f2 but also the IM3 component f3.
And f4 are also included, and this point is different from the case of the first embodiment. The phase of the IM3 component input to the terminal b is
Phase of carrier components f1 and f2 is 0 ° (reference phase)
Then, it becomes α + 180 °. Note that α shown here
Are defined in the same manner as in the first embodiment. The level of the IM3 component input to the terminals d and e is different from the level of the IM3 component input to the terminal b. Therefore, in FIG. 10, the levels of the IM3 component shown in (d) and (e) are shown to be different from the levels of the IM3 component shown in (b). The magnitude relationship between these levels is an example, and is not limited to the one shown in the figure.

The signals at the terminals f and g shown in FIGS. 11A and 11B include IM in addition to the carrier component.
As the three components, a component existing at the terminal b and a component existing at the terminal e are included with a phase difference of 90 °. And the terminal f
Signal is amplified by the power amplifier 115 and appears at the terminal h. At that time, IM3 generated when two sine waves (carriers) f1 and f2 are input to the power amplifier 115
The IM3 component having a phase opposite to the phase (α) of the component,
Since the power is injected into the power amplifier 115, the power amplifier 11
5, the effect of predistortion distortion compensation appears, and as a result, the signal spectrum at the terminal h is in a form in which the IM3 component input at the phase α + 180 ° is suppressed in level, as shown in FIG. 11 (c).

In reality, however, some IM3 components remain, and for example, when the IM3 component generated in the power amplifier 115 has a higher level than the IM3 component injected into the power amplifier 115, the signal at the terminal h is I of phase α
The M3 component remains. A similar IM3 component remains at the terminal i, and a signal having a frequency spectrum as shown in FIG. 11D appears.

Each signal appearing at terminals h and i is 90
When input to the hybrid 117, only the IM3 component with the phase α + 270 ° appears at the terminal j as shown in FIG. 12, and the carrier component with the phase 90 ° as shown in FIG. IM + 3 component of α + 90 ° appears. Then, the signal at the terminal j and the signal at the terminal k are combined with each other in the directional coupler 118. At this time, the IM3 components of both signals are canceled out because the phase difference is 180 °. As a result, only the carrier component is output to the output terminal 102 (terminal m) as shown in FIG.

By doing so, in the present embodiment, the IM3 component generated in the power amplifier is subjected to pre-distortion in which the distortion is suppressed in the power amplifier and the post-distortion in which the distortion is suppressed in the directional coupler 118. Since it is possible to suppress both of them, it is possible to further suppress the distortion as a whole.

Since distortion is suppressed by combining pre-distortion and post-distortion,
The level of the distortion component that contributes to post-distortion (that is, the IM3 component generated by the distortion generation circuit 111) can be made smaller than that in the first embodiment in which distortion suppression is performed only by post-distortion.
As a result, an effect equivalent to that of reducing the attenuation amount of the carrier component can be obtained.

Also, in the present embodiment, as in the first embodiment, the directional coupler 118 arranged at the subsequent stage of the power amplifier.
Because of the circuit configuration that suppresses distortion, it is possible to easily extract only the distortion component by the directional coupler 119 and use it for control.

In this embodiment as well, as in the first embodiment, the two power distributors 103 and 105 are used, but it is also possible to replace them all together by one triple distributor.

In the case of the present embodiment as well, as in the case of the first embodiment, it is possible to use bipolar transistors for the distortion generating elements 107 and 121 and the power amplifiers 115 and 116, and the distortion can be prevented. Generator 1
It is also possible to use a diode for 07.

Also in the case of the present embodiment, as in the case of the first embodiment, it is possible to use transmission lines such as microstrip lines or delay filters other than the coaxial cables for the delay circuits 104 and 106. is there. Further, not only the delay circuit whose propagation delay time is fixed as used in the present embodiment but also a delay circuit whose delay time can be changed like a variable delay filter can be used. Further, in the present embodiment, the distortion generating circuit 124
Although the delay circuit 104 is connected to the subsequent stage, this order can be reversed, or the delay circuit 104 can be omitted in some cases.

In the present embodiment, the variable attenuators 108 and 112 and the variable phase are adjusted by using the signal appearing at the first output terminal (terminal j) of the 90 ° hybrid 117 and the signal to the input terminal 101. Although the control of the containers 109 and 113 is performed, this control can be performed using the signal to the input terminal 101 and the signal appearing at the output terminal 102. Further, although the variable attenuators 108 and 112 and the variable phase shifters 109 and 113 are controlled in the present embodiment, it is also possible to control the variable attenuator 122 and the variable phase shifter 123.

(Third Embodiment) FIG. 14 is a block diagram showing the structure of an amplifier circuit with distortion compensation according to a third embodiment of the present invention. In FIG. 14, the same components as those in the second embodiment are designated by the same reference numerals as those in FIG. The present embodiment differs from the second embodiment in that a distortion generation circuit 142 having an internal configuration different from that of the distortion generation circuit 124 is used to generate a signal including both a carrier and an IM3 component at a terminal b. That is the point.

The internal structure of the distortion generating circuit 142 will be described. The distortion generating circuit 142 includes a power distributor 126 that distributes one signal distributed by the power distributor 103, a delay circuit 104 that delays one signal distributed by the power distributor 126, and a power distributor 126. The distortion generating element 121 that inputs the other distributed signal and generates IM3, and the variable attenuator 1 that changes the amplitude and phase of the IM3 component and the carrier component generated in the distortion generating element 121.
22 and the variable phase shifter 123, a power combiner 125 that combines the output signal from the variable phase shifter 123 and the carrier component that is the output signal from the power distributor 130 such that the carrier components have opposite phases, and the power Variable attenuator 127 and variable phase shifter 128 for changing the amplitude and phase of the output signal of the combiner 125 (the carrier component is canceled out and only the IM3 component), the IM3 component which is the output signal from the variable phase shifter 128, and the delay circuit. And a power combiner 129 that combines the carrier component, which is the output signal from 104, with each other.

The distortion generating circuit 14 configured as described above.
In 2, the phase difference between the carrier component and the IM3 component at the terminal b can be changed by adjusting the variable phase shifter 128. As a result, each terminal (a to
The signal spectrums in k and m) are as shown in FIGS. 6 and 10 to 13 as in the case of the second embodiment.

As described above, by using the variable attenuator 127 and the variable phase shifter 128, the phase difference and level between the carrier component generated at the terminal b and the IM3 component can be arbitrarily changed, so that the power from the terminal b can be changed. IM at terminals f and g injected into amplifiers 115 and 116
It is easy to adjust the phases of the three components (α + 180 ° in FIG. 11 (a) and α + 270 ° in FIG. 11 (b)) so as to be opposite to the phase of IM3 generated in the power amplifiers 115 and 116. It will be possible. As a result, the distortion suppression due to the effect of predistortion can be increased, and the total distortion suppression amount can be increased.

In addition, in the present embodiment as well as in the first embodiment, the directional coupler 118 arranged in the subsequent stage of the power amplifier.
Because of the circuit configuration that suppresses distortion, it is possible to easily extract only the distortion component by the directional coupler 119 and use it for control.

In this embodiment, three 2
Although the distributors 103, 105 and 126 have been used, it is possible to replace them all together with one 4 distributor, or to use 3 distributors and 2 distributors one by one. Is also possible.

Also in the case of the present embodiment, as in the case of the first embodiment, the strain generating elements 107 and 121,
Further, bipolar transistors can be used for the power amplifiers 115 and 116, and diodes can be used for the strain generating elements 107 and 121.

In the case of the present embodiment as well, as in the case of the first embodiment, transmission lines such as microstrip lines and delay filters other than coaxial cables can be used for the delay circuits 104 and 106. is there. Further, not only the delay circuit whose propagation delay time is fixed as used in the present embodiment but also a delay circuit whose delay time can be changed like a variable delay filter can be used.

In this embodiment, the variable attenuators 108 and 112 and the variable phase are adjusted by using the signal appearing at the first output terminal (terminal j) of the 90 ° hybrid 117 and the signal to the input terminal 101. Although the control of the containers 109 and 113 is performed, this control can be performed using the signal to the input terminal 101 and the signal appearing at the output terminal 102. Further, although the variable attenuators 108 and 112 and the variable phase shifters 109 and 113 are controlled in the present embodiment, it is also possible to control the variable attenuators 122 and 127 and the variable phase shifters 123 and 128. is there.

(Fourth Embodiment) FIG. 15 is a block diagram showing the configuration of an amplifier circuit with distortion compensation according to the fourth embodiment of the present invention. In FIG. 15, the same components as those in the second embodiment are designated by the same reference numerals as those in FIG. This embodiment is different from the second embodiment in that a carrier component that appears in the output of the delay circuit 104 and a power distribution are generated when a composite signal of the carrier component and the IM3 component that is input to the terminal b is generated. This is that the power combiner 129 combines the IM3 component that appears at one terminal of the device 131 and has its amplitude and phase changed by the variable attenuator 127 and the variable phase shifter 128. By doing so, the signal spectrum appearing at each terminal (a to k and m) is
Similar to the case of the second or third embodiment, it is as shown in FIGS. 6 and 10 to 13.

Also in the present embodiment, as in the case of the third embodiment, the variable attenuator 127 and the variable phase shifter 12 are used.
8, the phase difference between the carrier component appearing at the terminal b and the IM3 component and the level can be arbitrarily changed. It is easy to adjust the phase of the IM3 component (α + 180 ° in FIG. 11A and α + 270 ° in FIG. 11B) so as to be opposite to the phase of IM3 generated in the power amplifiers 115 and 116. It will be possible. As a result, the distortion suppression due to the effect of predistortion can be increased, and the total distortion suppression amount can be increased. Further, the number of components of the circuit can be reduced as compared with the third embodiment, so that the size can be reduced.

Also, in the present embodiment, as in the first embodiment, the directional coupler 118 arranged in the subsequent stage of the power amplifier.
Because of the circuit configuration that suppresses distortion, it is possible to easily extract only the distortion component by the directional coupler 119 and use it for control.

Note that, in this embodiment, as in the first embodiment, two power distributors 103 and 105 are used.
It is also possible to replace them all together with one 3-way divider.

In the case of the present embodiment, as in the case of the first embodiment, the strain generating elements 107 and 121,
In addition, bipolar transistors can be used for the power amplifiers 115 and 116, and diodes can be used for the strain generating elements 107 and 121.

Also in the case of the present embodiment, as in the case of the first embodiment, it is possible to use transmission lines such as microstrip lines and delay filters other than coaxial cables for the delay circuits 104 and 106. is there. Further, not only the delay circuit whose propagation delay time is fixed as used in the present embodiment but also a delay circuit whose delay time can be changed like a variable delay filter can be used.

In this embodiment, the variable attenuators 108 and 112 and the variable phase are adjusted by using the signal appearing at the first output terminal (terminal j) of the 90 ° hybrid 117 and the signal to the input terminal 101. Although the control of the containers 109 and 113 is performed, this control can be performed using the signal to the input terminal 101 and the signal appearing at the output terminal 102. Further, although the variable attenuators 108 and 112 and the variable phase shifters 109 and 113 are controlled in the present embodiment, it is also possible to control the variable attenuator 127 and the variable phase shifter 128.

(Fifth Embodiment) FIG. 16 is a block diagram showing the structure of a feedforward amplifier according to the fifth embodiment of the present invention. In FIG. 16, the input terminal 1
51 is connected to a terminal o of the power distributor 153, and a terminal p of the power distributor 153 has a variable attenuator 154 and a variable phase shifter 1
55 and the main amplifier 15 via the driver amplifier 156.
Connected to 7. The output of the main amplifier 157 is connected to the terminal r of the power distributor 159, and the terminal s of the power distributor 159 is connected to the terminal u of the distortion detecting power combiner 160. On the other hand, the terminal q of the power distributor 153 is connected to the delay circuit 1
It is connected to the terminal v of the distortion detecting power combiner 160 via 58.

The terminal t of the power distributor 159 is connected to the delay circuit 1
It is connected to the terminal x of the distortion removing power combiner 165 via 61. The terminal w of the distortion detecting power combiner 160 is connected to the auxiliary amplifier 164 that amplifies the distortion signal via the variable attenuator 162 and the variable phase shifter 163. The output of the auxiliary amplifier 164 is the distortion removing power combiner 1
It is connected to the terminal y of 65. Distortion power combiner 1
The terminal z of 65 is connected to the output terminal 152. Here, the amplifier circuit with distortion compensation according to any one of the first to fourth embodiments of the present invention is used for the main amplifier 157.

The operation of the feedforward type amplifier configured as described above will be described below. The input signal including the multi-channel component input from the input terminal 151 is split into two by the power splitter 153. One of the two divided output signals enters the variable attenuator 154 and the variable phase shifter 155 from the terminal p, the amplitude and the phase are adjusted there, and then is amplified by the driver amplifier 156 and further amplified by the main amplifier 157. It

Due to the non-linearity of the main amplifier 157, the main amplifier 157 outputs a signal containing a distortion component due to intermodulation between multi-channel signals in addition to the input signal component. This signal is input to the terminal r of the power distributor 159,
It is distributed to terminals s and t. The signal output to the terminal s is input to the terminal u of the distortion detecting power combiner 160.

The other signal divided into two by the power distributor 153 enters the delay circuit 158 from the terminal q, is delayed there, and is input to the terminal v of the distortion detecting power combiner 160. Here, the input signal components in the signals input to the terminals u and v are equal in amplitude and opposite in phase to each other.
Variable attenuator 154, variable phase shifter 155 and delay circuit 1
58 is adjusted, so that the signal having only the distortion component in which the input signal component is canceled is output from the terminal w.

Next, the signal of only the distortion component output from the terminal w is adjusted in amplitude and phase by the variable attenuator 162 and the variable phase shifter 163, and amplified by the auxiliary amplifier 164. At this time, in the auxiliary amplifier 164, the amplification operation is performed with sufficient back-off so that new non-linear distortion does not occur, so that the input distortion component is directly amplified and output from the auxiliary amplifier 164. This distortion component is input to the terminal y of the distortion removing power combiner 165. on the other hand,
The signal including the distortion component output from the terminal t is delayed by the delay circuit 161, and input to the terminal x of the distortion removing power combiner 165.

Here, the variable attenuator 162, the variable phase shifter 163, and the delay circuit 16 are arranged so that the distortion components of the signals input to the terminals y and x have the same amplitude and opposite phases.
By adjusting 1, the distortion component is canceled at the terminal z, and the signal obtained by amplifying only the input signal component is output terminal 15
2 is output.

With an ideal feedforward type amplifier, regardless of the distortion characteristics of the main amplifier 157, the output terminal 1
It should be possible to suppress all distortion components at 52,
There is a limit to the amount of distortion suppression that can be actually realized. In order to realize a large distortion suppression amount, the delay time is made equal in the path from the terminal o to the terminal u and the path from the terminal o to the terminal v, and the difference in amplitude and phase of each signal passing through both paths Needs to be small. Similarly, from terminal r to terminal x
It is necessary to equalize the delay times of the path up to and the path from the terminal r to the terminal y, and further reduce the difference in amplitude and phase of each signal passing through both paths. Therefore, the smaller the distortion component generated in the main amplifier 157, the smaller the total distortion.

Therefore, in the present embodiment, the distortion compensating amplifier circuit according to any one of the first to fourth embodiments is used for the main amplifier 157 to reduce the distortion generated in the main amplifier 157. There is. As a result, this feed-forward type amplifier can significantly suppress distortion, which was impossible in the past.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an amplifier circuit with distortion compensation according to a first embodiment of the present invention.

2A to 2E are diagrams showing signal spectra at terminals a to e of the distortion-compensated amplifier circuit according to the first embodiment of the present invention, respectively.

3A to 3D are diagrams showing signal spectra at terminals f to i of the amplifier circuit with distortion compensation according to the first embodiment of the present invention, respectively.

FIG. 4 is a diagram illustrating a signal spectrum at a terminal j of the amplifier circuit with distortion compensation according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a signal spectrum at a terminal va of the amplifier circuit with distortion compensation according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a signal spectrum at a terminal m of the distortion-compensated amplifier circuits according to the first to fourth embodiments of the present invention.

FIG. 7 is a flowchart showing an example of operation in the first control circuit 1416.

FIG. 8 is a flowchart showing another operation example of the first control circuit 1416.

FIG. 9 is a block diagram showing a configuration of an amplifier circuit with distortion compensation according to a second embodiment of the present invention.

10A to 10E are diagrams showing signal spectra at terminals a to e of the amplifier circuit with distortion compensation according to the second embodiment of the present invention, respectively.

FIGS. 11A to 11D are diagrams showing signal spectra at terminals f to i of an amplifier circuit with distortion compensation according to a second embodiment of the present invention, respectively.

FIG. 12 is a diagram showing a signal spectrum at a terminal j of the amplifier circuit with distortion compensation according to the second embodiment of the present invention.

FIG. 13 is a diagram showing a signal spectrum at a terminal va of an amplifier circuit with distortion compensation according to a second embodiment of the present invention.

FIG. 14 is a block diagram showing a configuration of an amplifier circuit with distortion compensation according to a third embodiment of the present invention.

FIG. 15 is a block diagram showing a configuration of an amplifier circuit with distortion compensation according to a fourth embodiment of the present invention.

FIG. 16 is a block diagram showing a configuration of an amplifier circuit with distortion compensation according to a fifth embodiment of the present invention.

FIG. 17 is a block diagram showing a configuration example of a conventional amplifier circuit with distortion compensation using a predistortion method.

[Explanation of symbols]

100 signal input unit 101 input terminal 102 output terminal 103, 105, 126, 130, 131, 1411
Power distributor 104, 106 Delay circuit 107, 121 Distortion generating element 108, 112, 122, 127 Variable attenuator 109, 113, 123, 128 Variable phaser 110, 125, 129 Power combiner 111, 124, 142 Distortion generating circuit 114, 117 90 ° hybrid 115, 116 Power amplifier 118, 119, 120 Directional coupler 141 Control unit 1412 First filter 1413 Second filter 1414 First power detector 1415 Second power detector 1416 First Control circuit 1417 second control circuit 1418 third power detector

Continued front page    (72) Inventor Seiji Fujiwara             3-1, Tsunashima-Higashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. F-term (reference) 5J090 AA01 AA41 CA21 FA20 GN02                       GN04 KA02 KA15 KA16 KA23                       KA41 KA55 KA68 MA20 SA13                       TA01 TA03 TA07

Claims (31)

[Claims] 1. An amplifier circuit with distortion compensation for amplifying a signal and compensating for distortion generated when amplifying the signal, comprising two amplifier means arranged in parallel with each other and amplifying the signal. , An original signal containing a carrier component and a first distortion signal having the same frequency as the frequency of distortion generated when the original signal is amplified by each of the amplifying means are input, and the original signal and the first signal A first combining / distributing means for synthesizing the distorted signals of the above and then dividing the divided signals into two, and outputting the two signals to the two amplifying means; And a synthesizing unit for synthesizing and outputting the two signals output from the second synthesizing and distributing unit, wherein the first and second synthesizing and distributing units respectively divide into two. The two signals obtained are Characterized in that it is a hybrid outputs with a phase difference of a constant, the distortion-compensated amplifier circuit. 2. The amplifier circuit with distortion compensation according to claim 1, further comprising signal input means for inputting the original signal and the first distortion signal to the first combining / distributing means. 3. The signal input means according to claim 2, further comprising phase adjusting means for adjusting respective phases of the original signal and / or the first distorted signal to be input to the first combining / distributing means. Amplifier circuit with distortion compensation. 4. The first and second combination and distribution means are 90 ° hybrids that output two signals with a phase difference of 90 °, and the phase adjustment means includes the first combination and distribution means. The first distorted signal and the first distorted signal so that the first distorted signal to be input to the means has a phase difference of 180 ° with respect to the distortion generated when the original signal is amplified by each of the amplification means. The amplifier circuit with distortion compensation according to claim 3, wherein each phase of the distortion signal is adjusted. 5. The amplification with distortion compensation according to claim 4, wherein the signal input means further includes amplitude adjusting means for adjusting the amplitude of the first distortion signal to be input to the first combining / distributing means. circuit. 6. The amplitude adjusting means sets the amplitude of the first distortion signal to be input to the first combining / distributing means to the amplitude of distortion generated when the original signal is amplified by each of the amplifying means. The amplifier circuit with distortion compensation according to claim 5, wherein the amplifier circuit is adjusted to be equal to. 7. A signal including only a distortion component whose phase is delayed by 90 ° from the first distortion signal input to the first combining / distributing means from the second combining / distributing means; 2 of a carrier component whose phase is delayed by 90 ° with respect to the original signal input to the combining / distributing means and a distortion component whose phase is advanced by 90 ° with respect to the first distortion signal input to the first combining / distributing means. 7. A signal including two components is output, and the signal input means further includes control means for controlling the phase adjusting means and the amplitude adjusting means based on the power of the signal containing only the distortion component. An amplifier circuit with distortion compensation according to item 1. 8. The signal input means includes a dividing means for dividing the original signal into two, and a first distortion for generating the first distortion signal based on one original signal obtained by dividing into two. The distortion compensating amplifier circuit according to claim 2, further comprising: a generating unit. 9. The distortion adding means for adding, to the original signal, a second distortion component having the same frequency as the distortion generated when the original signal is amplified by each of the amplifying means. An amplifier circuit with distortion compensation according to claim 2, comprising: 10. The signal input means adjusts each phase of the original signal to which the second distortion component is added and / or the first distortion signal to be input to the first combining / distributing means. The distortion-compensated amplifier circuit according to claim 9, further comprising a phase adjusting unit. 11. The first and second combining / distributing means are 90 ° hybrids each of which outputs two signals with a phase difference of 90 °, and the phase adjusting means includes the first combining / dividing means. The first distortion signal to be input to the means has a phase difference of 180 ° with respect to the distortion generated when the original signal to which the second distortion component is added is amplified by each amplification means. The distortion-compensated amplifier circuit according to claim 10, wherein each phase of the original signal and the first distortion signal is adjusted. 12. The amplification with distortion compensation according to claim 10, wherein the signal input means further includes amplitude adjusting means for adjusting the amplitude of the first distortion signal to be input to the first combining / distributing means. circuit. 13. The amplitude adjusting means sets an amplitude of the first distortion signal as an amplitude of distortion generated when the original signal to which the second distortion component is added is amplified by each amplifying means. The distortion-compensated amplifier circuit according to claim 12, wherein the amplifier circuits are adjusted to be equal. 14. A signal including only a distortion component whose phase is delayed by 90 ° from the first distortion signal input to the first combining / distributing means, from the second combining / distributing means; 2 of a carrier component whose phase is delayed by 90 ° with respect to the original signal input to the combining / distributing means and a distortion component whose phase is advanced by 90 ° with respect to the first distortion signal input to the first combining / distributing means. 14. A signal including two components is output, and the signal input means further includes control means for controlling the phase adjusting means and the amplitude adjusting means based on the power of the signal containing only the distortion component. An amplifier circuit with distortion compensation according to item 1. 15. The amplification with distortion compensation according to claim 9, wherein the signal input means further includes amplitude adjusting means for adjusting the amplitude of the first distortion signal to be input to the first combining / distributing means. circuit. 16. The amplitude adjusting means sets an amplitude of the first distortion signal as an amplitude of distortion generated when the original signal to which the second distortion component is added is amplified by each amplifying means. 16. The amplifier circuit with distortion compensation according to claim 15, wherein the amplifier circuit is adjusted to be equal. 17. A signal including only a distortion component whose phase is delayed by 90 ° from the first distortion signal input to the first combining / distributing means from the second combining / distributing means; 2 of a carrier component whose phase is delayed by 90 ° with respect to the original signal input to the combining / distributing means and a distortion component whose phase is advanced by 90 ° with respect to the first distortion signal input to the first combining / distributing means. 17. A signal including two components is output, and the signal input means further includes control means for controlling the phase adjusting means and the amplitude adjusting means based on the power of the signal containing only the distortion component. An amplifier circuit with distortion compensation according to item 1. 18. The signal input means further comprises a dividing means for dividing the original signal into two, and a first distortion signal for generating the first distortion signal based on one original signal obtained by dividing into two. Distortion generating means, wherein the distortion adding means generates the second distortion component based on the other original signal obtained by dividing into two, and adds the second distortion component to the other original signal. The amplifier circuit with distortion compensation according to claim 9, which is characterized in that. 19. The signal input means further includes a first dividing means for dividing the original signal into two, and one original signal obtained by dividing the original signal by two. The distortion adding means includes a first distortion generating means for generating a first distortion signal and a second distributing means for distributing the first distortion signal generated by the first distortion generating means into two. , The one first distortion signal obtained by the second dividing means by dividing into two is added as the second distortion component to the other original signal obtained by dividing by the first distributing means. The distortion-compensated amplifier circuit according to claim 9, wherein: 20. First power distribution means for distributing an input signal; first propagation time delay means for adjusting a propagation delay time of one signal distributed by the first power distribution means; Second power distribution means for distributing the other signal distributed by the first power distribution means, and second propagation time delay for adjusting the propagation delay time of the one signal distributed by the second power distribution means Means, distortion generating means for generating a distortion signal by inputting the other signal distributed by the second power distribution means, and first amplitude adjusting means for adjusting the amplitude and phase of the output signal from the distortion generating means. A first combining means for synthesizing an output signal from the vector adjusting means, the second propagation time delay means, and an output signal from the first vector adjusting means;
Power combining means, second vector adjusting means for adjusting the amplitude and phase of the output signal from the first power combining means, an output signal from the first propagation time delay means, and the second First power combining and distributing means for combining the output signal from the vector adjusting means and dividing into two, two power amplifying means for amplifying the combined and distributed two signals respectively, and combining the amplified two signals A second power combiner / divider for splitting into two, and a second power combiner for combining the two signals combined and distributed by the second power combiner / divider with the first and second powers. There are 9 combining and distributing means, respectively.
It is a 0-degree hybrid, and at least one of the first and second vector adjusting means has a distortion component included in a signal from the second vector adjusting means to the first power combining and distributing means, An amplification circuit with distortion compensation, characterized in that the amplitude and the phase of the signal are adjusted so that the amplitude and the phase are opposite to the distortion generated when the signal is amplified by the means. 21. A control means for detecting one output signal of the second power combining / distributing means and controlling the first and second vector adjusting means using the detection result. An amplifier circuit with distortion compensation according to item 1. 22. First power distribution means for distributing an input signal, and first distortion generation means for generating a distortion signal by inputting one of the signals distributed by the first power distribution means, First vector adjusting means for adjusting the amplitude and phase of the output signal from the first distortion generating means, and a first propagation time delay for adjusting the propagation delay time of the output signal from the first vector adjusting means. Means, a second power distribution means for distributing the other signal distributed by the first power distribution means, and a first power distribution adjusting means for adjusting the propagation delay time of the one signal distributed by the second power distribution means. Second propagation time delay means, second distortion generating means for generating a distortion signal by inputting the other signal distributed by the second power distributing means, and output from the second distortion generating means. The synthesized second vector adjustment means for adjusting the signal amplitude and phase, the output signal from the second propagation time delay means and an output signal from said second vector adjustment means 1
Power combining means, third vector adjusting means for adjusting the amplitude and phase of the output signal from the first power combining means, the output signal from the first propagation time delay means, and the third First power combining and distributing means for combining the output signal from the vector adjusting means and dividing into two, two power amplifying means for amplifying the combined and distributed two signals respectively, and combining the amplified two signals A second power combiner / divider for splitting into two, and a second power combiner for combining the two signals combined and distributed by the second power combiner / divider with the first and second powers. There are 9 combining and distributing means, respectively.
It is a 0-degree hybrid, and the first vector adjusting means is configured such that the first distortion component included in the signal from the first delay means to the first power combining and distributing means is the power amplification means. Is adjusted so that the amplitude and the phase are the same amplitude and opposite phase with respect to the distortion generated when the signal is amplified, and at least one of the second and third vector adjusting means is the third The second distortion component included in the signal from the vector adjusting means to the first power combining / distributing means is generated when the signal including the first distortion component is amplified by the power amplifying means. An amplifier circuit with distortion compensation, characterized in that the amplitude and phase of the signal are adjusted so as to have equal amplitude and opposite phase with respect to. 23. Further provided is a control means for detecting one output signal of said second power combining / distributing means and controlling said first, second and third vector adjusting means using the detection result. The amplifier circuit with distortion compensation according to claim 22. 24. First power distribution means for distributing an input signal, second power distribution means for distributing one of the signals distributed by the first power distribution means, and second power distribution means. The first propagation time delay means for adjusting the propagation delay time of one of the signals distributed by the second power distribution means and the first signal for generating the distortion signal by inputting the other signal distributed by the second power distribution means. Distortion generating means, first vector adjusting means for adjusting the amplitude and phase of the output signal from the first distortion generating means, and third for distributing the other signal distributed by the first power distributing means. Power distribution means, second propagation time delay means for adjusting the propagation delay time of one signal distributed by the third power distribution means, and an output signal of the second propagation time delay means. 4
Power distribution means, second distortion generation means for generating a distortion signal by inputting the other signal distributed by the third power distribution means, and output signals from the second distortion generation means. Second power adjusting means for adjusting amplitude and phase, one signal distributed by the fourth power distributing means, and first power combining for combining the output signal from the first vector adjusting means. Means, a third vector adjusting means for adjusting the amplitude and phase of the output signal from the first power combining means, an output signal from the first propagation time delay means, and the third vector adjusting means Second synthesis with output signal from
Power combining means, a third power combining means for combining the other signal distributed by the fourth power distributing means, and an output signal from the second vector adjusting means, and the third power. Fourth vector adjusting means for adjusting the amplitude and phase of the output signal from the combining means, the output signal from the second power combining means, and the output signal from the fourth vector adjusting means are combined to obtain 2 First power combining and distributing means for distributing, two power amplifying means for amplifying the two combined and distributed signals, respectively, and second power combining and distributing means for combining the amplified two signals and distributing into two. A second power combining means for combining the two signals combined and distributed by the second power combining and distributing means, wherein each of the first and second power combining and distributing means has 9
It is a 0-degree hybrid, and at least one of the first and third vector adjusting means has a first distortion component included in a signal from the second power combining means to the first power combining and distributing means, The amplitude and the phase of the signal are adjusted so that the power amplifier has the same amplitude and the opposite phase with respect to the distortion generated when the signal is amplified by the power amplifier. In at least one of the signals, the second distortion component included in the signal from the fourth vector adjusting means to the first power combining and distributing means is amplified by the power amplifying means and the signal including the first distortion component is amplified. An amplifier circuit with distortion compensation, characterized in that the amplitude and phase of the signal are adjusted so as to have equal amplitude and opposite phase with respect to the distortion generated at the time. 25. Control means for detecting one output signal of said second power combining / distributing means and controlling said first, second, third and fourth vector adjusting means using the detection result. The distortion-compensated amplifier circuit according to claim 24, further comprising: 26. First power distribution means for distributing an input signal; first propagation time delay means for adjusting a propagation delay time of one signal distributed by the first power distribution means; Second power distribution means for distributing the other signal distributed by the first power distribution means, and second propagation time delay for adjusting the propagation delay time of the one signal distributed by the second power distribution means Means, distortion generating means for generating a distortion signal by inputting the other signal distributed by the second power distribution means, and first amplitude adjusting means for adjusting the amplitude and phase of the output signal from the distortion generating means. A first combining means for synthesizing an output signal from the vector adjusting means, the second propagation time delay means, and an output signal from the first vector adjusting means;
And a third power distribution means for distributing the output signal from the first power combination means.
Power distribution means, second vector adjustment means for adjusting the amplitude and phase of one of the signals distributed by the third power distribution means, an output signal from the first propagation time delay means, and Second combining with the output signal from the second vector adjusting means
Power combining means, third vector adjusting means for adjusting the amplitude and phase of the other signal distributed by the third power distributing means, an output signal from the second power combining means, and First power combining / distributing means for combining the output signals from the vector adjusting means of No. 3 and dividing into two, two power amplifying means for amplifying each of the two combined / distributed signals, and the amplified two signals. A second electric power combining and distributing unit for combining and dividing into two, and a second electric power combining unit for combining the two signals combined and distributed by the second electric power combining and distributing unit, and the first and second Power combining and distributing means of 9
It is a 0 degree hybrid, The said 3rd vector adjustment means WHEREIN: The said 1st distortion component contained in the signal which goes to the said 1st electric power synthetic | combination distribution means from the said 2nd electric power synthetic | combination means WHEREIN: The amplitude and phase of the signal are adjusted so that the signal has the same amplitude and opposite phase with respect to the distortion generated when the signal is amplified, and at least one of the first and second vector adjusting means is the first A second distortion component included in the signal from the second vector adjusting means to the first power combining and distributing means is generated when the signal including the first distortion component is amplified by the power amplifying means. An amplifier circuit with distortion compensation, characterized in that the amplitude and phase of the signal are adjusted so as to have equal amplitude and opposite phase with respect to distortion. 27. Further provided is a control means for detecting one output signal of the second power combining / distributing means and controlling the first, second and third vector adjusting means using the detection result. An amplifier circuit with distortion compensation according to claim 26. 28. A first power divider that divides an input signal into two, a first vector adjustment circuit that adjusts the amplitude and phase of one of the two divided output signals of the first power divider, A main amplifier that amplifies the output signal of the first vector adjustment circuit; a second power distributor that divides the output signal of the main amplifier into two; and a second output signal of the other of the first power distributor that is divided into two. A first delay circuit that delays the phase; a distortion detection power combiner that combines the output signal of the first delay circuit and one of the two divided output signals of the second power distributor; A second vector adjustment circuit that adjusts the amplitude and phase of the output signal of the power combiner for distortion detection; an auxiliary amplifier that amplifies the output signal of the second vector adjustment circuit; Delay the phase of the other output signal that is split into two A second delay circuit for controlling the distortion, and a power combiner for distortion removal for combining and outputting the output signal of the auxiliary amplifier and the output signal of the second delay circuit, and the main amplifier distributes the input signal. First power distribution means, first propagation time delay means for adjusting the propagation delay time of one of the signals distributed by the first power distribution means, and the other distributed by the first power distribution means Second power distribution means for distributing the signal of No. 1, second propagation time delay means for adjusting the propagation delay time of one signal distributed by the second power distribution means, and the second power distribution means Distortion generating means for generating a distorted signal by inputting the other signal distributed by, the first vector adjusting means for adjusting the amplitude and phase of the output signal from the distortion generating means, and the second propagation The synthesized output signal from between delay means and an output signal from said first vector adjustment means 1
Power combining means, second vector adjusting means for adjusting the amplitude and phase of the output signal from the first power combining means, an output signal from the first propagation time delay means, and the second First power combining and distributing means for combining the output signal from the vector adjusting means and dividing into two, two power amplifying means for amplifying the combined and distributed two signals respectively, and combining the amplified two signals A second power combiner / divider for splitting into two, and a second power combiner for combining the two signals combined and distributed by the second power combiner / divider with the first and second powers. There are 9 combining and distributing means, respectively.
It is a 0-degree hybrid, and at least one of the first and second vector adjusting means has a distortion component included in a signal from the second vector adjusting means to the first power combining and distributing means, A feed-forward type amplifier, characterized in that the amplitude and phase of the signal are adjusted so as to have the same amplitude and opposite phase with respect to the distortion generated when the signal is amplified by the means. 29. A first power divider that divides an input signal into two, a first vector adjustment circuit that adjusts the amplitude and phase of one of the two divided output signals of the first power divider, and A main amplifier that amplifies the output signal of the first vector adjustment circuit; a second power distributor that divides the output signal of the main amplifier into two; and a second output signal of the other of the first power distributor that is divided into two. A first delay circuit that delays the phase; a distortion detection power combiner that combines the output signal of the first delay circuit and one of the two divided output signals of the second power distributor; A second vector adjustment circuit that adjusts the amplitude and phase of the output signal of the power combiner for distortion detection; an auxiliary amplifier that amplifies the output signal of the second vector adjustment circuit; Delay the phase of the other output signal that is split into two And a distortion removing power combiner for combining and outputting the output signal of the auxiliary amplifier and the output signal of the second delay circuit, and the main amplifier distributes the input signal. First power distribution means, first distortion generation means for generating a distortion signal by inputting one of the signals distributed by the first power distribution means, and output from the first distortion generation means First vector adjusting means for adjusting the amplitude and phase of the signal; first propagation time delaying means for adjusting the propagation delay time of the output signal from the first vector adjusting means; and the first power distribution means. Second power distribution means for distributing the other signal distributed by the second power distribution means, second propagation time delay means for adjusting the propagation delay time of the one signal distributed by the second power distribution means, and 2 power Second distortion generating means for generating a distortion signal by inputting the other signal distributed by the distributing means, and second vector adjustment for adjusting the amplitude and phase of the output signal from the second distortion generating means. Means for synthesizing the output signal from the second propagation time delay means and the output signal from the second vector adjusting means
Power combining means, third vector adjusting means for adjusting the amplitude and phase of the output signal from the first power combining means, the output signal from the first propagation time delay means, and the third First power combining and distributing means for combining the output signal from the vector adjusting means and dividing into two, two power amplifying means for amplifying the combined and distributed two signals respectively, and combining the amplified two signals A second power combiner / divider for splitting into two, and a second power combiner for combining the two signals combined and distributed by the second power combiner / divider with the first and second powers. There are 9 combining and distributing means, respectively.
It is a 0-degree hybrid, and the first vector adjusting means is configured such that the first distortion component included in the signal from the first propagation time delay means to the first power combining and distributing means is generated by the power amplifying means. The amplitude and phase of the signal are adjusted so that the signal has the same amplitude and opposite phase with respect to the distortion generated when the signal is amplified, and at least one of the second and third vector adjusting means is A second distortion component included in the signal from the third vector adjusting means to the first power combining and distributing means is generated when the power amplification means amplifies the signal including the first distortion component. A feed-forward type amplifier, characterized in that the amplitude and phase of the signal are adjusted so as to have equal amplitude and opposite phase with respect to the distortion. 30. A first power divider that divides an input signal into two, a first vector adjustment circuit that adjusts the amplitude and phase of one of the two divided output signals of the first power divider, and A main amplifier that amplifies the output signal of the first vector adjustment circuit; a second power distributor that divides the output signal of the main amplifier into two; and a second output signal of the other of the first power distributor that is divided into two. A first delay circuit that delays the phase; a distortion detection power combiner that combines the output signal of the first delay circuit and one of the two divided output signals of the second power distributor; A second vector adjustment circuit that adjusts the amplitude and phase of the output signal of the power combiner for distortion detection; an auxiliary amplifier that amplifies the output signal of the second vector adjustment circuit; Delay the phase of the other output signal that is split into two And a distortion removing power combiner for combining and outputting the output signal of the auxiliary amplifier and the output signal of the second delay circuit, and the main amplifier distributes the input signal. First power distribution means, second power distribution means for distributing one of the signals distributed by the first power distribution means, and propagation delay of one of the signals distributed by the second power distribution means First propagation time delay means for adjusting time, first distortion generating means for generating a distortion signal by inputting the other signal distributed by the second power distribution means, and the first distortion First vector adjusting means for adjusting the amplitude and phase of the output signal from the generating means; third power distributing means for distributing the other signal distributed by the first power distributing means; Power distributor Fourth distributing a second propagation time delay means for adjusting the propagation delay time of one signal distributed, the output signal of the second propagation time delay means by
Power distribution means, second distortion generation means for generating a distortion signal by inputting the other signal distributed by the third power distribution means, and output signals from the second distortion generation means. Second power adjusting means for adjusting amplitude and phase, one signal distributed by the fourth power distributing means, and first power combining for combining the output signal from the first vector adjusting means. Means, a third vector adjusting means for adjusting the amplitude and phase of the output signal from the first power combining means, an output signal from the first propagation time delay means, and the third vector adjusting means Second synthesis with output signal from
Power combining means, a third power combining means for combining the other signal distributed by the fourth power distributing means, and an output signal from the second vector adjusting means, and the third power. Fourth vector adjusting means for adjusting the amplitude and phase of the output signal from the combining means, the output signal from the second power combining means, and the output signal from the fourth vector adjusting means are combined to obtain 2 First power combining and distributing means for distributing, two power amplifying means for amplifying the two combined and distributed signals, respectively, and second power combining and distributing means for combining the amplified two signals and distributing into two. A second power combining means for combining the two signals combined and distributed by the second power combining and distributing means, wherein each of the first and second power combining and distributing means has 9
It is a 0-degree hybrid, and at least one of the first and third vector adjusting means has a first distortion component included in a signal from the second power combining means to the first power combining and distributing means, The amplitude and the phase of the signal are adjusted so that the power amplifier has the same amplitude and the opposite phase with respect to the distortion generated when the signal is amplified by the power amplifier. In at least one of the signals, the second distortion component included in the signal from the fourth vector adjusting means to the first power combining and distributing means is amplified by the power amplifying means and the signal including the first distortion component is amplified. A feedforward type amplifier characterized in that the amplitude and phase of the signal are adjusted so as to have an equal amplitude and an opposite phase with respect to the distortion generated at the time. 31. A first power divider that divides an input signal into two, a first vector adjustment circuit that adjusts the amplitude and phase of one of the two divided output signals of the first power divider, and A main amplifier that amplifies the output signal of the first vector adjustment circuit; a second power distributor that divides the output signal of the main amplifier into two; and a second output signal of the other of the first power distributor that is divided into two. A first delay circuit that delays the phase; a distortion detection power combiner that combines the output signal of the first delay circuit and one of the two divided output signals of the second power distributor; A second vector adjustment circuit that adjusts the amplitude and phase of the output signal of the power combiner for distortion detection; an auxiliary amplifier that amplifies the output signal of the second vector adjustment circuit; Delay the phase of the other output signal that is split into two And a distortion removing power combiner for combining and outputting the output signal of the auxiliary amplifier and the output signal of the second delay circuit, and the main amplifier distributes the input signal. First power distribution means, first propagation time delay means for adjusting the propagation delay time of one of the signals distributed by the first power distribution means, and the other distributed by the first power distribution means Second power distribution means for distributing the signal of No. 1, second propagation time delay means for adjusting the propagation delay time of one signal distributed by the second power distribution means, and the second power distribution means Distortion generating means for generating a distorted signal by inputting the other signal distributed by, the first vector adjusting means for adjusting the amplitude and phase of the output signal from the distortion generating means, and the second propagation The synthesized output signal from between delay means and an output signal from said first vector adjustment means 1
And a third power distribution means for distributing the output signal from the first power combination means.
Power distribution means, second vector adjustment means for adjusting the amplitude and phase of one of the signals distributed by the third power distribution means, an output signal from the first propagation time delay means, and Second combining with the output signal from the second vector adjusting means
Power combining means, third vector adjusting means for adjusting the amplitude and phase of the other signal distributed by the third power distributing means, an output signal from the second power combining means, and First power combining / distributing means for combining the output signals from the vector adjusting means of No. 3 and dividing into two, two power amplifying means for amplifying each of the two combined / distributed signals, and the amplified two signals. A second electric power combining and distributing unit for combining and dividing into two, and a second electric power combining unit for combining the two signals combined and distributed by the second electric power combining and distributing unit, and the first and second Power combining and distributing means of 9
It is a 0 degree hybrid, The said 3rd vector adjustment means WHEREIN: The said 1st distortion component contained in the signal which goes to the said 1st electric power synthetic | combination distribution means from the said 2nd electric power synthetic | combination means WHEREIN: The amplitude and phase of the signal are adjusted so that the signal has the same amplitude and opposite phase with respect to the distortion generated when the signal is amplified, and at least one of the first and second vector adjusting means is the first A second distortion component included in the signal from the second vector adjusting means to the first power combining and distributing means is generated when the signal including the first distortion component is amplified by the power amplifying means. A feed-forward type amplifier characterized in that the amplitude and phase of the signal are adjusted so as to have equal amplitude and opposite phase with respect to distortion.