CN114513173A - A radio frequency power amplifier and its application - Google Patents

Abstract

The present disclosure provides a radio frequency power amplifier, comprising: an input power divider for power distribution of a radio frequency input signal and outputting a first radio frequency signal and a second radio frequency signal; a first signal amplifier for amplifying the first radio frequency signal The power of the first radio frequency signal after power amplification is obtained; the first directional coupler is used to couple the second radio frequency signal to obtain the direct radio frequency signal and the coupled radio frequency signal; the second signal amplifier is used to amplify the direct radio frequency signal The power of the signal and the coupled RF signal to obtain the power-amplified straight-through RF signal and the coupled RF signal; the IPD module is used to adjust the phase of the power-amplified straight-through RF signal, and amplify the phase-adjusted straight-through RF signal and power. The coupled radio frequency signal and the power amplified first radio frequency signal are subjected to power synthesis to output a radio frequency output signal. The present disclosure also provides an application of a radio frequency power amplifier.

Description

A radio frequency power amplifier and its application

technical field

The present disclosure relates to the technical field of power amplifiers, and in particular, to a high temperature superconducting resonator, a filter and applications thereof.

Background technique

As a key device for amplifying signals in the RF front-end, the power amplifier (power amplifier) plays an extremely important role in the communication transceiver. The main design difficulty of the current power amplifier is how to achieve broadband and efficient performance indicators. The difficulty of high-efficiency indicators is that in order to obtain high frequency utilization, modern communication standards usually use high-order modulation signals with a peak-to-average ratio (PAPR), so it is necessary to achieve high efficiency within a high backoff range.

The traditional class AB linear power amplifier can only obtain high efficiency near the saturation power and cannot meet the current demand for high back-off. The current solution to this problem mainly includes two categories, namely Doherty and load based on the principle of load modulation. The balanced power amplifier (Load Modulated Balanced Amplifier, LMBA) architecture and the envelope tracking technology (ET) based on the principle of voltage modulation, the envelope tracking technology mainly adjusts the power supply voltage of the power amplifier adaptively by extracting the envelope of the input signal. However, This technology is affected by the modulation bandwidth of the power supply, and it is difficult to adapt to the needs of current broadband modulation signals. The Doherty architecture is the most widely used power amplifier architecture, however, the bandwidth is still limited by the quarter-wavelength line of the output matching network. In view of the problems existing in the above two efficient architectures, it is necessary to propose an LMBA power amplifier architecture that can achieve high fallback efficiency in a wide bandwidth range.

SUMMARY OF THE INVENTION

In order to solve the above problems in the prior art, the present disclosure provides a radio frequency power amplifier and an application thereof, aiming at realizing a high-performance radio frequency LMBA power amplifier.

A first aspect of the present disclosure provides a radio frequency power amplifier, including: an input power divider, configured to perform power distribution on a radio frequency input signal, and output a first radio frequency signal and a second radio frequency signal; a first signal amplifier, which inputs The terminal is connected to the first output terminal of the input power divider, which is used to amplify the power of the first radio frequency signal to obtain the first radio frequency signal after power amplification; the first directional coupler, the first input terminal of which is connected to the input power divider The second output end of the second signal amplifier is connected to the ground, and the second input end is grounded through the load resistance, which is used for coupling processing of the second radio frequency signal to obtain the direct radio frequency signal and the coupled radio frequency signal; the second signal amplifier, the first input end of which is connected to the first fixed radio frequency signal. It is connected to the first output end of the coupler, and the second input end is connected to the second output end of the first directional coupler, and is used for amplifying the power of the direct radio frequency signal and the coupled radio frequency signal to obtain the direct radio frequency signal after power amplification and the power of the coupled radio frequency signal. Coupling radio frequency signals; IPD module, the first input end of which is connected to the first output end of the second signal amplifier, the second input end is connected to the second output end of the second signal amplifier, and the third input end is connected to the first output end of the first signal amplifier. The output end is connected to adjust the phase of the power-amplified straight-through radio frequency signal, and perform power synthesis on the phase-adjusted straight-through radio frequency signal, the power-amplified coupled radio frequency signal, and the power-amplified first radio frequency signal, and output the radio frequency output signal.

Further, the IPD module includes: a first OMN module, the input end of which is connected to the first output end of the second signal amplifier, for carrying out load conjugate matching on the power-amplified straight-through radio frequency signal; the second OMN module, its input The terminal is connected to the second output terminal of the second signal amplifier, which is used to perform load conjugate matching on the coupled radio frequency signal after power amplification; the input terminal of the third OMN module is connected to the output terminal of the first signal amplifier, and is used to perform load conjugate matching on the coupled radio frequency signal after power amplification. The first radio frequency signal after power amplification is subjected to load conjugate matching; the first, second and third input ends of the second directional coupler are respectively connected with the output ends of the first OMN module, the second OMN module and the third OMN module The connection is used to perform power synthesis on the output signals of the first OMN module, the second OMN module and the third OMN module, and output a radio frequency output signal.

Further, the IPD module is connected with the first signal amplifier and the second signal amplifier through bonding wires respectively.

Further, the second signal amplifier includes: a first power amplifier balancer, the input end of which is connected to the first output end of the first directional coupler, for amplifying the power of the direct radio frequency signal to obtain the direct radio frequency signal after power amplification; The input end of the second power amplifier balancer is connected to the second output end of the first directional coupler, and is used for amplifying the power of the coupled radio frequency signal to obtain the coupled radio frequency signal after power amplification.

Further, the input end of the first power amplifier balancer is connected to the first output end of the first directional coupler, and is used for amplifying the power of the coupled radio frequency signal to obtain the coupled radio frequency signal after power amplification; the second power amplifier balancer, The input end is connected to the second output end of the first directional coupler, and is used for amplifying the power of the direct radio frequency signal to obtain the direct radio frequency signal after power amplification.

Further, the first signal amplifier is a power amplifier regulator.

Further, the working state of the radio frequency power amplifier includes: a fallback area or a non-fallback area; wherein, when the radio frequency power amplifier works in the non-fallback area, the first signal amplifier is in an open state, and the IPD module is used for the first signal amplifier. Phase adjustment and power synthesis are performed on the output signals of the two-signal amplifiers; when the RF power amplifier works in the fallback zone, the first signal amplifier is in a closed state, and the IPD module is used for the output signals of the first signal amplifier and the second signal amplifier. Perform phase adjustment and power combining.

Further, when the radio frequency power amplifier works in the fallback region, the output signal of the first signal amplifier is also used to modulate the load impedance of the second signal amplifier.

Further, the load impedance of the second signal amplifier is proportional to the amplitude of the output signal of the first signal amplifier.

Further, both the first directional coupler and the second directional coupler are Lange directional couplers.

Further, the coupling ports and the through ports of the first directional coupler and the second directional coupler are oppositely arranged.

Further, the first radio frequency signal and the second radio frequency signal are radio frequency signals with different amplitudes.

A second aspect of the present disclosure provides an application of the radio frequency power amplifier provided in the first aspect of the present disclosure to a radar receiver and a wireless communication system.

The present disclosure provides a radio frequency power amplifier and an application thereof. The input end of the radio frequency power amplifier distributes a part of the power to the control power amplifier through a Wilkinson power divider. Therefore, the CPA does not need a separate radio frequency input signal, and the output matching circuit as a whole Realized by the IPD module, it not only meets the requirements of integrated miniaturization, but also greatly improves the performance and design flexibility.

Description of drawings

For a more complete understanding of the present disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 schematically shows a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present disclosure;

FIG. 2 schematically shows a schematic structural diagram of a directional coupler structure according to an embodiment of the present disclosure;

FIG. 3 schematically shows a schematic structural diagram of an IPD module according to an embodiment of the present disclosure;

FIG. 4 schematically shows a schematic diagram of the overall structure of a power amplifier according to an embodiment of the present disclosure.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present disclosure. In the following detailed description, for convenience of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It will be apparent, however, that one or more embodiments may be practiced without these specific details. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present disclosure.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present disclosure. The terms "comprising", "comprising" and the like as used herein indicate the presence of stated features, steps, operations and/or components, but do not preclude the presence or addition of one or more other features, steps, operations or components.

All terms (including technical and scientific terms) used herein have the meaning as commonly understood by one of ordinary skill in the art, unless otherwise defined. It should be noted that terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly rigid manner.

In the traditional structure of the traditional LMBA power amplifier, it includes three power amplifiers, which are two balanced power amplifiers BPA and one control power amplifier CPA. Among them, the balanced power amplifier BPA is biased to deep class AB, and the control power amplifier CPA is biased to class C. There are two directional couplers at the input and output ends respectively for power synthesis and power distribution. The BPA of the two balanced power amplifiers is exactly the same, while the control The power amplifier CPA is used to modulate the load of the balanced power amplifier in the fallback area, and controlling the amplitude and phase of the power amplifier CPA will affect both the load amplitude and phase of the balanced power amplifier BPA. For the two-way balanced power amplifier BPA, due to the 90° phase difference between the two output ports of the bridge, the in-phase synthesis of power can be achieved through the two directional couplers, and the power that controls the power amplifier CPA will eventually be output to the load. Therefore, compared to Doherty's two-way power combining architecture, the LMBA power amplifier can use three-way combining to obtain the corresponding power. Theoretically, the bandwidth of the LMBA is only limited by the bandwidth of the directional coupler. Since the bandwidth of the directional coupler can be very wide, the LMBA has the potential for broadband applications.

Since the LMBA can achieve high back-off efficiency, the working state of the LMBA power amplifier can be divided into a low-power area and a high-power area. In the low-power area, only the balanced power amplifier BPA works, and the CPA is in a class C bias, so the CPA is turned off , the port is open. Assuming that the characteristic impedance of the bridge is Z ₀ , the current passing through the balanced power amplifier BPA is I _b , and the current passing through the control power amplifier CPA is I _c . It should be noted that I _c here is a complex number, including phase information, and I _b can be considered as are real numbers used to facilitate calculations. In the low-power region, the load impedance of the BPA of the balanced power amplifier is Z ₀ . Z ₀ can be designed as the best impedance point in the fallback region to reduce the loss of the matching network.

因此通过控制I_c的幅度和相位就可以实现对平衡功放BPA的端口阻抗控制，并且合理调节电流比值就可以实现相应的回退范围。If Z ₀ cannot be satisfied, an additional matching network can be added at the BPA output position of the balanced power amplifier for impedance transformation. In the high-power region, the control power amplifier CPA is turned on to modulate the balanced power amplifier BPA load. At this time, the load impedance of the control power amplifier CPA port is Z ₀ , and the load impedance of the balanced power amplifier BPA port is

Therefore, the port impedance control of the balanced power amplifier BPA can be realized by controlling the amplitude and phase of I _c , and the corresponding fallback range can be realized by adjusting the current ratio reasonably.

LMBA architecture is currently mainly used in low-frequency bands, such as board-level LMBA and integrated LMBA, but the traditional LMBA application still has some defects, mainly reflected in: 1), CPA needs a separate RF input, because LMBA is a three-way synthesis The structure of the RF signal is distributed by the bridge and then amplified by the two-way balanced power amplifier BPA. For the control power amplifier CPA, because it is necessary to flexibly control the phase and amplitude of the output current of the power amplifier CPA, a separate RF input signal is required to control the control power amplifier CPA. Generate two independent RF signal inputs. 2) The board-level LMBA has limited high-frequency applications and is too large in size; the integrated LMBA has low design flexibility, small bandwidth, high loss and high cost. For the LMBA architecture, its bandwidth is mainly limited by the directional coupler. In theory, the board level will use a commercial bridge to complete the role of the directional coupler. The bandwidth of the commercial bridge can be very wide, but most of them use multi-stage The loss of multi-level bridges is mostly large, which will seriously affect the efficiency. In addition, due to the serious parasitics of board-level power amplifiers, this limits the application and performance of LMBA in high frequency, and with the increase of communication frequency, integration and miniaturization are the development trends of power amplifiers in the future. The main difficulty for the integrated LMBA scheme lies in the consideration of cost and the lack of design flexibility.

Finally, in terms of output matching, the matching circuit design of the power amplifier can usually be completed by using commercial lumped components with microstrip lines on the substrate. However, the problem with this method is that the price of commercial components is relatively expensive, and there is a certain deviation in value. And it is more sensitive to parasitic effects. Generally, this method can be used for low-frequency design. The integration of high-frequency power amplifiers is a trend, so most of them are done by microwave monolithic integrated circuits (MMICs). The disadvantages of this method are high cost and insufficient design flexibility. Versions of the program require a lot of time to complete the verification. The key point in the design of the power amplifier circuit is the design of the output matching circuit, which is the decisive factor to determine whether the power amplifier can achieve the expected performance. The general fully integrated output matching circuit has low flexibility due to less metal layers, and the matching circuit has The source area is integrated together, and a large amount of layout area needs to be wasted if multiple matching circuits are designed. Therefore, there is another hybrid integration solution for this problem, namely the Integrated Passive Device (IPD) solution. The principle of this solution is that the process does not include the layer structure of the active area, only the required metal and dielectric layers of the output matching circuit. This solution not only satisfies the requirement of integrated miniaturization, but also greatly improves the flexibility of the design and saves the cost. In addition, the metal layer of the IPD is thicker, so the hybrid integration scheme can be considered for use in the LMBA.

Based on the above problems, the present disclosure provides a radio frequency power amplifier, including: an input power divider, used for power distribution of a radio frequency input signal, and outputting a first radio frequency signal and a second radio frequency signal; a first signal amplifier, whose input end It is connected to the first output end of the input power divider, and is used to amplify the power of the first radio frequency signal to obtain the first radio frequency signal after power amplification; the first directional coupler, the first input end of which is connected to the power divider The second output end is connected, and the second input end is grounded through the load resistor, which is used for coupling processing of the second radio frequency signal to obtain the direct radio frequency signal and the coupled radio frequency signal; the second signal amplifier, the first input end of which is connected to the first directional signal. The first output end of the coupler is connected, and the second input end is connected to the second output end of the first directional coupler, and is used for amplifying the power of the direct radio frequency signal and the coupled radio frequency signal to obtain the power amplified direct radio frequency signal and coupling RF signal; IPD module, the first input terminal of which is connected to the first output terminal of the second signal amplifier, the second input terminal is connected to the second output terminal of the second signal amplifier, and the third input terminal is connected to the output terminal of the first signal amplifier. It is used to adjust the phase of the power-amplified straight-through RF signal, and perform power synthesis on the phase-adjusted straight-through RF signal, the power-amplified coupled RF signal, and the power-amplified first RF signal, and output the RF output. Signal.

In the radio frequency power amplifier and its application provided by the embodiments of the present disclosure, the input end of the radio frequency power amplifier distributes a part of the power to the control power amplifier through the Wilkinson power divider. The whole matching circuit is realized by the IPD module, which not only meets the requirements of integrated miniaturization, but also greatly improves the performance and design flexibility.

The technical solutions of the present disclosure will be described in detail below with reference to the schematic structural diagrams of the radio frequency power amplifiers in the specific embodiments of the present disclosure. It should be understood that the structures of the radio frequency power amplifier shown in FIG. 1 to FIG. 4 are exemplary to help those skilled in the art understand the technical solutions of the present disclosure, but are not intended to limit the protection scope of the present disclosure.

FIG. 1 schematically shows a schematic structural diagram of a radio frequency power amplifier according to an embodiment of the present disclosure.

As shown in FIG. 1 , the radio frequency power amplifier 100 includes: an input power divider 10 , a first signal amplifier 20 , a first directional coupler 30 , a second signal amplifier 40 and an IPD module 50 .

The input power divider 10 is configured to perform power distribution on the radio frequency input signal _RF in, and output the first radio frequency signal and the second radio frequency signal.

According to an embodiment of the present disclosure, the input power divider 10 may be, for example, a Wilkinson power divider, one end of which is used to access the radio frequency input signal RF _in , and distributes the power of the radio frequency input signal RF _in according to a preset ratio , and output the first radio frequency signal and the second radio frequency signal. For example, the preset ratio can be any ratio, preferably the output amplitudes of the first radio frequency signal and the second radio frequency signal are not equal.

In the embodiment of the present disclosure, the radio frequency input signal RF _in is distributed to the balanced power amplifier BPA and the control power amplifier CPA through the Wilkinson power divider 10, which avoids an additional channel of radio frequency input signal and greatly improves the compatibility of the LMBA radio frequency power amplifier. .

The input end of the first signal amplifier 20 is connected to the first output end of the input power divider 10, and is used for amplifying the power of the first radio frequency signal to obtain the power amplified first radio frequency signal.

In the embodiment of the present disclosure, the first signal amplifier 20 may be, for example, a control power amplifier CPA, used to amplify the power of the first radio frequency signal, and modulate the load of the balanced power amplifier BPA to obtain a power amplified first radio frequency signal.

The first directional coupler 30, the first input end of which is connected to the second output end of the input power divider 10, the second input end is grounded through the load resistor R, and is used for coupling processing of the second radio frequency signal to obtain a direct radio frequency signals and coupled RF signals.

In the embodiment of the present disclosure, as shown in FIG. 2 , the first directional coupler 30 may be a 90°Lange directional coupler 30 , which includes four ports, for example, an input port 301 , a through port 302 , and a coupling port 303 respectively and isolated port 304. Specifically, the pass-through port 302 is used to directly output the pass-through radio frequency signal of the second radio frequency signal, and the coupling port 303 is used to adjust the phase of the second radio frequency signal by 90° and then output the coupled radio frequency signal. It should be noted that the arrangement positions of the input port 301 , the through port 302 , the coupling port 303 , and the isolation port 304 are only exemplary, and are not limited in the embodiments of the present disclosure.

For example, referring to FIG. 1 , the first input terminal of the first directional coupler 30 connected to the second output terminal of the input power divider 10 is the input port 301 , and the second input terminal connected to the ground through the load resistor R is isolated The port 304, the first output terminal and the second output terminal respectively connected to the input terminal of the second signal amplifier 40 are the through port 302 or the coupling port 303, respectively.

The second signal amplifier 40, the first input terminal of which is connected to the first output terminal of the first directional coupler 30, and the second input terminal is connected to the second output terminal of the first directional coupler 30 for amplifying the direct radio frequency The power of the signal and the coupled radio frequency signal is obtained to obtain the power-amplified through radio frequency signal and the coupled radio frequency signal.

In the embodiment of the present disclosure, the second signal amplifier 40 may be a power amplifier balancer including two channels, namely a first power amplifier balancer 401 and a second power amplifier balancer 402, wherein the first power amplifier balancer 401 and the second power amplifier The balancer 402 is a balanced power amplifier BPA with the same structure.

Specifically, the input end of the first power amplifier balancer 401 is connected to the pass-through port of the first directional coupler 30 for amplifying the power of the pass-through radio frequency signal to obtain the power-amplified pass-through radio frequency signal; The input end is connected to the coupling port of the first directional coupler 30 for amplifying the power of the coupled radio frequency signal to obtain the coupled radio frequency signal after power amplification. Or, the input end of the first power amplifier balancer 401 is connected to the coupling port of the first directional coupler 30 for amplifying the power of the coupled radio frequency signal to obtain the coupled radio frequency signal after power amplification; the input of the second power amplifier balancer 402 The terminal is connected to the straight-through port of the first directional coupler 30, and is used for amplifying the power of the straight-through radio frequency signal to obtain a power-amplified straight-through radio frequency signal.

The embodiment of the present disclosure does not limit the setting positions of the first power amplifier balancer 401 and the second power amplifier balancer 402 , and only needs to satisfy the following through ports and coupling ports of the second directional coupler 504 and the first directional coupler 30 . The straight-through port and the coupling port can be set in the opposite direction.

The IPD module 50 has its first input terminal connected to the first output terminal of the second signal amplifier 40 , the second input terminal connected to the second output terminal of the second signal amplifier 40 , and the third input terminal connected to the first signal amplifier 20 . The output end is connected to adjust the phase of the power-amplified straight-through radio frequency signal, and perform power synthesis on the phase-adjusted straight-through radio frequency signal, the power-amplified coupled radio frequency signal, and the power-amplified first radio frequency signal, and output the radio frequency output signal.

According to an embodiment of the present disclosure, as shown in FIG. 3 , the IPD module 50 specifically includes: a first OMN module 501 , a second OMN module 502 , a third OMN module 503 and a second directional coupler 504 .

The input end of the first OMN module 501 is connected to the first output end of the second signal amplifier 40, and is used for performing load conjugate matching on the power-amplified straight-through radio frequency signal. Specifically, the input end of the first OMN module 501 may be connected to the output end of the first power amplifier balancer 401 for performing load conjugate matching on the power-amplified through RF signal; or, the input end of the first OMN module 501 is also It can be connected to the output end of the second power amplifier balancer 402 for performing load conjugate matching on the coupled radio frequency signal after power amplification.

The input end of the second OMN module 502 is connected to the second output end of the second signal amplifier 40 for performing load conjugate matching on the coupled radio frequency signal after power amplification. Specifically, the input end of the second OMN module 502 can be connected to the output end of the second power amplifier balancer 402 for performing load conjugate matching on the coupled radio frequency signal after power amplification; or, the input end of the second OMN module 502 is also It can be connected to the output end of the first power amplifier balancer 401 to perform load conjugate matching on the power-amplified straight-through radio frequency signal.

The input end of the third OMN module 503 is connected to the output end of the first signal amplifier 20, and is used for performing load conjugate matching on the power amplified first radio frequency signal. Specifically, the input end of the third OMN module 503 is connected to the output end of the control power amplifier CPA20 to perform load conjugate matching on the output signal of the control power amplifier CPA20.

The first, second and third input terminals of the second directional coupler 504 are respectively connected to the output terminals of the first OMN module 501 , the second OMN module 502 and the third OMN module 503 , and are used for the direct connection of the power amplified. The radio frequency signal is phase-adjusted, and the phase-adjusted straight-through radio frequency signal, the power-amplified coupled radio frequency signal, and the power-amplified first radio frequency signal are power synthesized to output a radio frequency output signal RF _out .

In the embodiment of the present disclosure, the second directional coupler 504 and the first directional coupler 30 may adopt a 90° directional coupler with the same structure, such as a 90° Lange directional coupler, etc., only the second directional coupler 504 and the The through port and the coupling port of the first directional coupler 30 may be set opposite to each other.

For example, if the input end of the first power amplifier balancer 401 is connected to the through port of the first directional coupler 30 , the output end of the first power amplifier balancer 401 passes through the first OMN module 501 and is then directionally coupled to the second The coupling port of the second power amplifier balancer 402 is connected to the coupling port of the first directional coupler 30, and the output end of the second power amplifier balancer 402 is connected to the second power amplifier balancer 402 after passing through the second OMN module 502. The through port of the directional coupler 504 is connected. At this time, the coupling port of the second directional coupler 504 is connected with the first OMN module 501, the through port is connected with the second OMN module 502, and the isolated port is connected with the third OMN module 503, The other port is the RFout output port. Conversely, if the input end of the first power amplifier balancer 401 is connected to the coupling port of the first directional coupler 30 , the output end of the first power amplifier balancer 401 passes through the first OMN module 501 and is connected to the second directional coupler 504 . The through port of the second power amplifier balancer 402 is connected to the through port of the first directional coupler 30, then the output end of the second power amplifier balancer 402 is coupled to the second directional coupler after passing through the second OMN module 502. The coupling port of the second directional coupler 504 is connected to the coupling port of the directional coupler 504. At this time, the through port of the second directional coupler 504 is connected to the first OMN module 501, the coupling port of the second directional coupler 504 is connected to the second OMN module 502, the isolation port is connected to the third OMN module 503, and the other The port is the RFout output port. Based on this setting, the signal after passing through the secondary directional coupler can keep the same phase.

第二信号放大器40的负载阻抗与第一信号放大器20输出信号的幅值呈正比。Specifically, the working state of the radio frequency power amplifier 100 includes: a fallback zone or a non-fallback zone; wherein, when the radio frequency power amplifier 100 works in the non-fallback zone, the first signal amplifier 20 is in an open state, and the IPD module 50 It is used to perform phase adjustment and power synthesis processing on the output signal of the second signal amplifier 40; when the radio frequency power amplifier 100 works in the fallback area, the first signal amplifier 20 is in a closed state, and the IPD module 50 is used for the first signal. The output signals of the amplifier 20 and the second signal amplifier 40 are subjected to phase adjustment and power combining processing. And when the radio frequency power amplifier 100 operates in the fallback region, the output signal of the first signal amplifier 20 is also used to modulate the load impedance of the second signal amplifier 40 . In addition, according to

The load impedance of the second signal amplifier 40 is proportional to the amplitude of the output signal of the first signal amplifier 20 .

In the embodiment of the present disclosure, the input part outputs a part of the radio frequency input signal to the control power amplifier CPA20 through the Wilkinson power divider 10, and the control power amplifier CPA20 is in the class C bias, so the control power amplifier CPA20 is still cut off in the low power region At this time, compared with the traditional dual-channel RF input LMBA, the difference is only that the gain of the LMBA will be slightly lower, and the lower part is used to control the power amplifier CPA20. In the high power region, the power distribution ratio of the Wilkinson power divider 10 needs to be determined at this time, so that the control power amplifier CPA20 outputs corresponding power to complete the load modulation of the balanced power amplifier BPA. In addition, controlling the phase of the power amplifier CPA20 will also affect the load modulation. Therefore, in some other embodiments, an additional phase shift compensation network needs to be added before the branch of the power amplifier CPA20 is controlled. The determination of the power distribution ratio of the Wilkinson power divider 10 is mainly estimated and optimized according to the fallback range, and the phase can be confirmed later, that is, a value with the best comprehensive performance can be obtained by scanning in one cycle.

As shown in FIG. 4 , the output part of the power amplifier adopts the IPD module 50 to complete the matching of the passive output network. Generally, because the input impedance is low, the matching network is more sensitive, and the input has little influence on the performance, so the active area and the input matching network are mostly integrated. Even packaged transistor models have pre-matching circuits in most cases to convert the low input impedance to a higher impedance to reduce input sensitivity, so the input circuit does not use an IPD module. The connection between the output matching circuit and the transistor is mainly completed through the bonding wire 60. It is necessary to reserve the corresponding pad on the output position of the transistor and the IPD module 50. This part of the bonding wire 60 should be absorbed into the matching network during design and used as the output part of the match.

Since IPD has no active area, the power amplifier structure is much simpler than the process with integrated transistors, and additional metal layers will be added, so the advantages of designing matching circuits are obvious, mainly reflected in: there are more metal layers. In this case, the design flexibility of the IPD module 50 will be very high, and the design of relatively complex structures can be carried out; the process of the IPD module 50 is relatively cheap, and it has high advantages in design and mass production, and multiple versions can be made in the design. The optimal matching scheme can be selected, which shortens the development cycle and accelerates the iteration speed; the design of the LMBA power amplifier uses the IPD module 50 as the output matching circuit. Compared with the traditional fully integrated scheme, the size will basically not increase, and With more metal layers, the thickness will also increase, and the loss will decrease. When designing a directional coupler, the IPD module 50 can use a broadband Lange coupler, which overcomes the problem of board-level machining accuracy.

In addition, the output part of the power amplifier adopts the IPD module 50 to complete the matching of the passive output network, and the bandwidth of the coupler is greatly expanded by the setting of the 90° directional coupler. In the embodiment of the present disclosure, both the first directional coupler 30 and the second directional coupler 504 use a Lange coupler. The Lange coupler has a wide bandwidth. In order to achieve strong coupling, the line width and line spacing are compared. Therefore, due to the problem of processing accuracy, board-level power amplifiers generally do not use this structure. However, it is relatively simple to use the IPD module 50 to realize this structure, and the interconnection of the coupling lines 60 can be realized through through holes.

The RF power amplifier provided by the embodiments of the present disclosure has a simple and more compact structure, and is easy to manufacture. Compared with the traditional LMBA power amplifier, it has obvious advantages in terms of compatibility, cost, performance, and development cycle. .

Another embodiment of the present disclosure provides an application of the radio frequency power amplifier shown in the above embodiment to a radar receiver and a wireless communication system.

It should be noted that the above embodiments describe in detail the resonators and filters provided in the present disclosure, which do not constitute the limitations of the resonators and filters in the embodiments of the present disclosure. Part of the components can also be replaced by other structures. For example, the shape of the helical structure is not limited to being formed by rectangular microstrips, but can also be formed by arc-segment microstrips.

While the present disclosure has been illustrated and described in detail in the accompanying drawings and the foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive.

Those skilled in the art will appreciate that various range combinations and/or combinations of features recited in various embodiments and/or claims of the present disclosure are possible, even if such combinations or combinations are not expressly recited in the present disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments of the present disclosure and/or in the claims may be made without departing from the spirit and teachings of the present disclosure. All such combinations and/or combinations fall within the scope of this disclosure.

Although the present disclosure has been shown and described with reference to specific exemplary embodiments of the present disclosure, those skilled in the art will appreciate that, without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents, Various changes in form and detail have been made in the present disclosure. Therefore, the scope of the present disclosure should not be limited to the above-described embodiments, but should be determined not only by the appended claims, but also by their equivalents.

Claims (13)

1. A radio frequency power amplifier, comprising:

the input power divider (10) is used for performing power distribution on a radio frequency input signal and outputting a first radio frequency signal and a second radio frequency signal;

the input end of the first signal amplifier (20) is connected with the first output end of the input power divider (10) and is used for amplifying the power of the first radio-frequency signal to obtain a first radio-frequency signal after power amplification;

a first input end of the first directional coupler (30) is connected with a second output end of the input power divider (10), and a second input end of the first directional coupler is grounded through a load resistor and is used for coupling the second radio-frequency signal to obtain a through radio-frequency signal and a coupled radio-frequency signal;

a second signal amplifier (40), a first input end of which is connected to the first output end of the first directional coupler (30), and a second input end of which is connected to the second output end of the first directional coupler (30), for amplifying the power of the through radio frequency signal and the power of the coupling radio frequency signal, so as to obtain a power-amplified through radio frequency signal and a power-amplified coupling radio frequency signal;

an IPD module (50), a first input end of which is connected to a first output end of the second signal amplifier (40), a second input end of which is connected to a second output end of the second signal amplifier (40), and a third input end of which is connected to an output end of the first signal amplifier (20), for performing phase adjustment on the power-amplified direct radio frequency signal, performing power synthesis on the phase-adjusted direct radio frequency signal, the power-amplified coupled radio frequency signal, and the power-amplified first radio frequency signal, and outputting a radio frequency output signal.

2. The radio frequency power amplifier of claim 1, wherein the IPD module (50) comprises:

a first OMN module (501), an input end of which is connected to a first output end of the second signal amplifier (40), and configured to perform load conjugate matching on the power-amplified through radio frequency signal;

a second OMN module (502), an input end of which is connected to a second output end of the second signal amplifier (40), for performing load conjugate matching on the power-amplified coupled radio frequency signal;

a third OMN module (503), an input end of which is connected to an output end of the first signal amplifier (20), and configured to perform load conjugate matching on the power-amplified first radio frequency signal;

and a second directional coupler (504), a first input end, a second input end and a third input end of which are respectively connected with output ends of the first OMN module (501), the second OMN module (502) and the third OMN module (503), and are used for performing power synthesis on output signals of the first OMN module (501), the second OMN module (502) and the third OMN module (503) and outputting a radio frequency output signal.

3. The radio frequency power amplifier of claim 1, wherein the IPD module (50) is connected to the first signal amplifier (20) and the second signal amplifier (40) by bonding wires (60), respectively.

4. The radio frequency power amplifier according to claim 1, wherein the second signal amplifier (40) comprises:

the input end of the first power amplifier balancer (401) is connected with the first output end of the first directional coupler (30) and is used for amplifying the power of the through radio-frequency signal to obtain a power-amplified through radio-frequency signal;

and the input end of the second power amplifier balancer (402) is connected with the second output end of the first directional coupler (30) and is used for amplifying the power of the coupled radio-frequency signal to obtain a power-amplified coupled radio-frequency signal.

5. The radio frequency power amplifier according to claim 1, wherein the second signal amplifier (40) comprises:

a first power amplifier balancer (401), an input end of which is connected with a first output end of the first directional coupler (30), and is used for amplifying the power of the coupled radio frequency signal to obtain a power-amplified coupled radio frequency signal;

and the input end of the second power amplifier balancer (402) is connected with the second output end of the first directional coupler (30) and is used for amplifying the power of the through radio-frequency signal to obtain the power-amplified through radio-frequency signal.

6. The radio frequency power amplifier according to claim 4 or 5, wherein the first signal amplifier (20) is a power amplifier regulator.

7. The RF power amplifier of claim 6, wherein the operating state of the RF power amplifier comprises: a fallback or non-fallback area; wherein,

when the radio frequency power amplifier works in a non-back-off region, the first signal amplifier (20) is in an open circuit state, and the IPD module (50) is used for carrying out phase adjustment and power synthesis on an output signal of the second signal amplifier (40);

when the radio frequency power amplifier works in a backspacing region, the first signal amplifier (20) is in a closed state, and the IPD module (50) is used for carrying out phase adjustment and power synthesis on output signals of the first signal amplifier (20) and the second signal amplifier (40).

8. The rf power amplifier of claim 7, wherein the output signal of the first signal amplifier (20) is further used to modulate a load impedance of the second signal amplifier (40) when the rf power amplifier is operating in a back-off region.

9. The radio frequency power amplifier of claim 7, wherein the load impedance of the second signal amplifier (40) is proportional to the magnitude of the output signal of the first signal amplifier (20).

10. The rf power amplifier of claim 2, wherein the first directional coupler (30) and the second directional coupler (504) are Lange directional couplers.

11. The radio frequency power amplifier of claim 10, wherein the coupling ports and pass-through ports of the first directional coupler (30) and the second directional coupler (504) are oppositely disposed.

12. The RF power amplifier of claim 1, wherein the first RF signal and the second RF signal are RF signals with different amplitudes.

13. Use of a radio frequency power amplifier according to any of claims 1 to 12 in a communication transceiver and a communication system.

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