CN110048738A - Saturation detection circuit and transceiver based on automatic gain management - Google Patents

Abstract

The invention relates to a saturation detection circuit and a wireless transceiver based on automatic gain management. The wireless transceiver based on automatic gain management includes: an antenna module, a frequency synthesis module, a receiving module, a first saturation detection module, a baseband processing module, a transmission module, and a second saturation detection module. The wireless transceiver based on automatic gain management detects the swing of the output signal of the receiving module and the transmitting module by setting the saturation detection module, and adjusts the gain of the receiving module and the transmitting module in time, thereby reducing the power consumption of the wireless transceiver in time. , so that the power consumption and performance of the wireless transceiver reach the optimal value.

Description

Saturation Detection Circuit and Wireless Transceiver Based on Automatic Gain Management

technical field

The invention belongs to the field of radio frequency circuits, and in particular relates to a saturation detection circuit and a wireless transceiver based on automatic gain management.

Background technique

In today's information age, people have made the transmission and interaction of information an essential part of social life. Among them, wireless communication is the most active part in the communication field, and has been widely used in various aspects.

With the increasing demand for wireless radio frequency applications and the continuous innovation of CMOS advanced manufacturing processes, wireless transceivers need to meet the stringent requirements of communication systems during design. For example: as the radio frequency signal received by the wireless transceiver is different, the overall gain of the wireless transceiver will also be different; however, there are multiple gain modules in the wireless transceiver to achieve the overall gain of the wireless transceiver. In different environments, the gain adjustable range of each module is required to be different.

However, in the current design of the wireless transceiver, it is impossible to detect the swing of each module of the wireless transceiver in real time, so that the gain of the wireless transceiver cannot be adjusted in time, so that the power consumption of the wireless transceiver is large, and the overall Poor performance.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the present invention provides a saturation detection circuit and a wireless transceiver based on automatic gain management. The technical problem to be solved by the present invention is realized by the following technical solutions:

An embodiment of the present invention provides a saturation detection circuit, including: a first switch, a second switch, a first MOS transistor, a second MOS transistor, a capacitor, a resistor, and a comparator, wherein,

The first end of the first switch is connected to the first input end, and the second end of the first switch is connected to the drain of the first MOS transistor and the gate of the second MOS transistor;

The first end of the second switch is connected to the second input end, and the second end of the second switch is connected to the drain of the second MOS transistor and the gate of the first MOS transistor;

The source of the first MOS transistor is connected to the source of the second MOS transistor, and is connected to the input end of the comparator;

One end of the capacitor is connected to the source of the first MOS transistor and the source of the second MOS transistor, and is connected to the input end of the comparator, and the other end of the capacitor is grounded;

One end of the resistor is connected to the source of the first MOS transistor and the source of the second MOS transistor, and is connected to the input end of the comparator, and the other end of the resistor is grounded.

Another embodiment of the present invention provides a wireless transceiver based on automatic gain management, including:

Antenna module for receiving and transmitting radio frequency signals;

Frequency synthesis module, used to provide local oscillator signal;

a receiving module, configured to amplify the radio frequency signal, mix the amplified signal with the local oscillation signal, and then filter, amplify and convert the mixed signal to obtain a first digital signal;

a first saturation detection module, configured to detect the swing amplitude of the output signal of the receiving module, and obtain and output a first detection result, wherein the first saturation detection module includes at least one saturation detection circuit as provided in an embodiment of the present invention ;

The baseband processing module is configured to perform digital processing on the first detection result and the first digital signal to obtain a first processing result, and generate a second digital signal for transmission, and at the same time provide the frequency synthesis module with a third a digital signal to generate the local oscillator signal;

The transmitting module is used to perform digital-to-analog conversion, filtering and amplification on the second digital signal, mix the amplified signal with the local oscillation signal, and then filter and amplify the mixed signal to obtain the radio frequency signal;

The second saturation detection module is configured to detect the swing of the output signal of the transmitting module, obtain and output a second detection result to the baseband processing module, and the baseband processing module compares the second detection result and the The second digital signal is digitized to obtain a second processing result, wherein the second saturation detection module includes at least one saturation detection circuit as provided in the embodiment of the present invention.

In an embodiment of the present invention, it also includes:

a first gain management module, configured to adjust the gain of the receiving module according to the first detection result and the first processing result;

A second gain management module, configured to adjust the gain of the transmitting module according to the second detection result and the second processing result.

In an embodiment of the present invention, the receiving module includes:

a low noise amplifier, used for amplifying the radio frequency signal to obtain a first amplified signal;

a first mixing circuit, configured to perform frequency shifting of the first amplified signal and the first phase signal to obtain a first mixing signal;

a first low-pass filter, configured to filter the first mixing signal to obtain a first filtered signal;

a first variable gain amplifier for amplifying the first filtered signal to obtain a second amplified signal;

a second low-pass filter, configured to filter the second amplified signal to obtain a second filtered signal;

a first analog-to-digital converter for converting the second filtered signal into a fourth digital signal;

a second frequency mixing circuit, configured to perform frequency shifting of the amplified signal and the second phase signal to obtain a second frequency mixing signal;

a third low-pass filter, configured to filter the second mixing signal to obtain a third filtered signal;

a second variable gain amplifier, configured to amplify the third filtered signal to obtain a third amplified signal;

a fourth low-pass filter, configured to filter the second amplified signal to obtain a fourth filtered signal;

The second analog-to-digital converter is used for converting the fourth filtered signal into a fifth digital signal.

In an embodiment of the present invention, the first saturation detection module includes:

a first saturation detection circuit, configured to filter the first mixing signal and compare the filtered signal with a first preset parameter to obtain a first comparison result;

The second saturation detection circuit is configured to filter the second filtered signal and compare the filtered signal with a second preset parameter to obtain a second comparison result.

In an embodiment of the present invention, the first gain management module is configured to sequentially control the low noise amplifier, the first frequency mixing circuit and the said low noise amplifier according to the first detection result and the first processing result. The gain of the first variable gain amplifier is adjusted.

In an embodiment of the present invention, the transmitting module includes:

a second digital-to-analog converter for converting the second digital signal into an analog signal;

a fifth low-pass filter for filtering the analog signal to obtain a fifth filtered signal;

an automatic gain control amplifier for amplifying the fifth filtered signal to obtain a fourth amplified signal;

a third mixer, configured to perform frequency shifting on the fourth amplified signal and the local oscillation signal to obtain a third mixed signal;

a sixth low-pass filter, configured to filter the third mixing signal to obtain a sixth filtered signal;

A power amplifier, configured to amplify the sixth filtered signal to obtain the radio frequency signal for transmission.

In an embodiment of the present invention, the second saturation detection module includes:

a third saturation detection circuit, configured to filter the fourth amplified signal and compare the filtered signal with a third preset parameter to obtain a third comparison result;

a fourth saturation detection circuit, configured to filter the sixth filtered signal and compare the filtered signal with a fourth preset parameter to obtain a fourth comparison result;

The fifth saturation detection circuit is configured to filter the radio frequency signal for transmission and compare the filtered signal with the fifth preset parameter to obtain a fifth comparison result.

In an embodiment of the present invention, the second gain management module is configured to sequentially control the automatic gain control amplifier, the third mixer and all the other components according to the second detection result and the second processing result. The gain of the power amplifier is adjusted.

Compared with the prior art, the beneficial effects of the present invention:

1. The present invention detects the swing amplitude of the output signal of the receiving module and the transmitting module by setting the saturation detection module, sends the detection result to the baseband processing module, and adjusts the gain of the receiving module and the transmitting module in time, thereby reducing the wireless transceiver in time. The power consumption of the wireless transceiver is optimized, so that the power consumption and performance of the wireless transceiver can reach the optimal value.

2. The present invention adjusts the gain of each sub-module in the receiving module in turn according to the order of signal reception, adjusts the gain of each sub-module in the transmitting module in turn according to the order of signal transmission, and adjusts the receiving module and the transmitting module in a certain order. The gain of the module can make the power consumption of the wireless transceiver change in an orderly manner and keep its performance at an optimal value.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Description of drawings

1 is a schematic structural diagram of a saturation detection circuit provided by an embodiment of the present invention;

2 is a schematic structural diagram of a wireless transceiver based on automatic gain management provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another wireless transceiver based on automatic gain management provided by an embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

Example 1

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a saturation detection circuit according to an embodiment of the present invention. The saturation detection circuit includes: a first switch S1, a second switch S2, a first MOS switch M1, and a second MOS transistor M2 , capacitor C1, resistor R1 and comparator A1.

The first end of the first switch S1 is connected to the first input end, and the second end of the first switch S1 is connected to the drain of the first MOS transistor M1 and the gate of the second MOS transistor M2.

The first terminal of the second switch S2 is connected to the second input terminal, and the second segment of the second switch S2 is connected to the drain of the second MOS transistor and the gate of the first MOS transistor M1.

The source of the first MOS transistor M1 is connected to the source of the second MOS transistor M2, and is connected to the input terminal of the comparator A1.

One end of the capacitor C1 is connected to the source of the MOS transistor M1 and the source of the second MOS transistor M2, and is connected to the input end of the comparator, and the other end of the capacitor C1 is grounded.

One end of the resistor R1 is connected to the source of the first MOS transistor M1 and the source of the second MOS transistor M2, and is connected to the input end of the comparator A1, and the other end of the resistor R1 is grounded.

It can be seen from the connection relationship of the above components that the source of the first MOS transistor M1, the source of the second MOS transistor M2, one end of the capacitor C1, and one end of the resistor R1 are all connected to the same point, and are connected to the comparator A1. input.

When the saturation detection of the output signal of the wireless transceiver is performed, the first end of the first switch S1 is connected to the first input end, and the first input end is either the receiving module in the wireless transceiver or the two differential signal lines in the transmitting module. One, the first end of the first switch S1 is connected to any one of the two differential signals; the first end of the second switch S2 is connected to the second input end, and the second input end is the receiving module or the transmitting module in the wireless transceiver The other of the two differential signal lines in the second switch S2 is connected to the other of the two differential signal lines; the output end of the comparator A1 is connected to the baseband processing module in the wireless transceiver, the comparator A1 The result obtained from the comparison is sent to the baseband processing module for processing.

Specifically, during the test, the first switch S1 and the second switch S2 are turned on, and the first MOS transistor M1 and the second MOS transistor M2 are used to transmit the swing amplitude of the output signal of the receiving module or the transmitting module. The swing amplitude refers to the amplitude of the sine wave; the capacitor C1 and the resistor R1 together form a low-pass filter, and the low-pass filter filters out the high-frequency signals in the signals transmitted by M1 and M2. The amplitude signal is left; then the amplitude signal enters the comparator A1, and the comparator A1 compares the amplitude signal with the reference voltage VERF to obtain the comparison result, and outputs the comparison result to the baseband processing module for processing.

Further, the range of the reference voltage VERF value of different modules is different, and the reference voltage VERF value can be adjusted according to the needs of different modules.

Further, the comparator A1 compares the amplitude signal with the voltage of the reference voltage VERF, and when the output of the output end of the comparator A1 is a high level, then for the detected module, the saturation detection circuit detects that the result of the module to be detected is: Saturation; when the output of the output end of the comparator A1 is low level, then for the detected module, the result detected by the saturation detection circuit is not saturated.

The saturation detection circuit of the present invention filters the output signals of each module and then uses a comparator for comparison. The detection method is easy to operate and does not affect the operation of the wireless transceiver.

Embodiment 2

Please refer to FIG. 2, which is a schematic structural diagram of a wireless transceiver based on automatic gain management provided by an embodiment of the present invention, including: an antenna module 10, a frequency synthesis module 20, a receiving module 30, a first saturation detection module 40, The baseband processing module 50 , the transmitting module 60 , and the second saturation detection module 70 .

The antenna module 10 is used for receiving and transmitting radio frequency signals. Specifically, the antenna module 10 includes a signal receiving module and a signal transmitting module. The signal receiving module is used for receiving radio frequency signals, and the signal transmitting module is used for transmitting radio frequency signals.

The frequency synthesis module 20 is used for providing a local oscillation signal.

The receiving module 30 is respectively connected with the antenna module 10 and the frequency synthesis module 20, and the receiving module 30 is used for amplifying the radio frequency signal, then mixing the amplified signal with the local oscillation signal, and then filtering the mixed signal, After amplification and analog-to-digital conversion, a first digital signal is obtained.

The first saturation detection module 40 is used to detect the swing amplitude of the output signal of the receiving module 30 to obtain a first detection result, and output the first detection result; wherein the first saturation detection module 40 includes a number of saturation detection circuits, and the saturation detection circuit Please refer to the first embodiment for the structure. For each saturation detection circuit, one end (input end) of the first switch S1 is connected to any one of the two differential signal lines in the receiving module 30, and one end (input end) of the second switch S2 Connected to the other of the two differential signal lines in the receiving module 30 , the output end of the comparator A1 in each saturation detection circuit is connected to the baseband processing module 50 . Specifically, the first detection result includes two cases of high level and low level, wherein the high level represents that the detected module is in a saturated state, and the low level represents that the detected module is in an unsaturated state.

The baseband processing module 50 is respectively connected with the frequency synthesis module 20 , the receiving module 30 , the first saturation detection module 40 , the transmitting module 50 and the second detection module 70 , and is used for receiving and receiving the first detection result output by the first saturation detection module 40 . The first digital signal output by the module 30 is digitally processed to obtain a first processing result; the baseband processing module 50 is also used to generate a second digital signal for transmission; the baseband processing module 50 is also used to provide the frequency synthesis module 20 with the first digital signal. Three digital signals to enable the frequency synthesis module 20 to generate a local oscillation signal.

The transmitting module 60 is respectively connected with the frequency synthesis module 20 and the baseband processing module 50, and is used for performing digital-to-analog conversion, filtering and amplifying on the second digital signal, and mixing the amplified signal with the local oscillation signal, and then mixing the frequency The resulting signal is filtered and amplified to obtain a radio frequency signal for transmission, and the radio frequency signal for transmission is transmitted through the antenna module 10 .

The second saturation detection module 70 is configured to detect the swing amplitude of the output signal of the transmitting module 60 to obtain a second detection result, and output the second detection result to the baseband processing module 50 , and the baseband processing module 50 compares the second detection result and the first detection result. The two digital signals are digitized to obtain a second processing result; wherein the second saturation detection module 70 includes at least one saturation detection circuit, and the structure of the saturation detection circuit can be referred to in Embodiment 1; in each saturation detection circuit, the first switch S1 One end (input end) is connected to any one of the two differential signal lines in the transmitting module 60, one end (input end) of the second switch S2 is connected to the other one of the two differential signal lines in the transmitting module 60, each saturated The output end of the comparator A1 in the detection circuit is connected to the baseband processing module 50 . The second detection result also includes two cases of high level and low level.

Specifically, the wireless transceiver mainly includes two phases: a receiving phase and a transmitting phase. The receiving phase and the transmitting phase can be performed at the same time or not at the same time; therefore, the first saturation detection module 40 detects the swing of the output signal of the receiving module 30 The detection of the output signal swing of the transmitter module 60 by the second saturation detection module 70 may be performed simultaneously or not simultaneously, that is, the saturation detection of the transmitter module and the saturation detection of the receiver module do not affect each other.

In the present invention, the first saturation detection module is set in the receiving module of the wireless transceiver, the second saturation detection module is set in the transmitting module, and the swing amplitude of the output signal of the receiving module and the transmitting module is detected by the saturation detection module, so as to timely The gain of the receiving module and the transmitting module is adjusted to reduce the power consumption of the wireless transceiver in time, so that the power consumption and performance of the wireless transceiver both reach optimal values.

In a specific embodiment, the wireless transceiver based on automatic gain management further includes a first gain management module 80 and a second gain management module 90 . The first gain management module 80 is connected to the baseband processing module 50 and the receiving module 30, and is configured to adjust the gain of the receiving module 30 according to the first detection result and the first processing result. The second gain management module 90 is connected to the baseband processing module 50 and the transmitting module 60, and is configured to adjust the gain of the transmitting module 60 according to the second detection result and the second processing result.

Further, after receiving the first detection result, the baseband processing module 50 performs comprehensive processing on the first detection result and the first digital signal to obtain the first processing result. When the first detection result is a high level, the baseband processing module 50 controls the first gain management module 80 to reduce the gain of the tested receiving module according to the first processing result; when the first detection result is a low level, the baseband processing module 50 According to the first processing result, it is detected whether the signal output by the receiving module meets the minimum requirement for detection, and if the requirement is met, the increase of the gain is stopped.

Similarly, when the second detection result is a high level, the baseband processing module 50 controls the second gain management module 90 to reduce the gain of the tested transmitting module according to the second processing result; when the second detection result is a low level, the baseband The processing module 50 detects whether the signal output by the transmitting module meets the minimum detection requirement according to the second processing result, and stops increasing the gain if the signal meets the requirement.

The invention detects the swing amplitude of the output signal of the receiving module and the transmitting module by setting the saturation detection module, sends the detection result to the baseband processing module, and adjusts the gain of the receiving module and the transmitting module in time, thereby reducing the frequency of the wireless transceiver in time. power consumption, so that the power consumption and performance of the wireless transceiver can reach the optimal value.

Embodiment 3

Please refer to FIG. 3 , which is a schematic structural diagram of another wireless transceiver based on automatic gain management provided by an embodiment of the present invention.

In a specific embodiment, the frequency synthesis module 20 includes a first digital-to-analog converter (DAC1), a voltage-controlled crystal oscillator (VCXO), and a fractional-frequency division phase-locked loop (Fractional-N PLL).

The first digital-to-analog converter is connected to the baseband processing module 50 for converting the third digital signal generated by the baseband processing module 50 into a static voltage signal; the voltage-controlled crystal oscillator is connected to the first digital-to-analog converter for A stable reference clock is generated according to the static voltage signal; the fractional frequency division phase-locked loop is connected with the voltage-controlled crystal oscillator to generate a stable local oscillation signal according to the reference clock.

Further, the frequency synthesis module 20 also includes: a phase shifter, connected between the fractional frequency division phase-locked loop and the receiving module 30, for adjusting the phase of the local oscillation signal to generate the first phase signal and the second phase signal .

Specifically, the signals generated by the Fractional-N PLL are differential signals of 0 degrees and 180 degrees. The receiving module 30 includes an I channel and a Q channel. The I channel requires local oscillator signals of 0 degrees and 180 degrees, and the Q channel requires are the local oscillator signals of 90 degrees and 270 degrees. Therefore, a phase shifter is required to generate the signals required by the I channel and the Q channel, wherein the first phase signal refers to one of the signals required by the I channel and the Q channel, and the second phase signal refers to the required signal from the I channel and the Q channel. another in the signal. Further, the model of the phase shifter is a 0/90 phase shifter.

Further, the number of DAC1, VCXO, and Fractional-N PLL in the frequency synthesis module 20 can be one each, and they are connected to the receiving module 30 in turn, and are connected to the transmitting module 60 in turn, so as to provide the receiving module 30 with a local oscillation signal, and also for the receiving module 30. The transmit module 60 provides the local oscillator signal. In addition, the DAC1, VCXO, Fractional-N PLL that provides the local oscillation signal for the receiving module 30 can be different from the DAC1, VCXO, Fractional-NPLL that provides the local oscillation signal for the transmitting module 60, that is, there is a set of DAC1, VCXO, Fractional-N The PLL is connected to the receiving module 30 in sequence, while another set of DAC1, VCXO, and Fractional-N PLL is connected to the transmitting module 60 in sequence.

In a specific embodiment, the receiving module 30 includes sub-modules: a low noise amplifier (LNA), a first mixing circuit (MIX1), a first low-pass filter (LPF1), a first variable gain amplifier (PGA1), The second low-pass filter (LPF2), the first analog-to-digital converter (ADC1), the second mixing circuit (MIX2), the third low-pass filter (LPF3), the second variable gain amplifier (PGA2), the third Four low-pass filters (LPF4) and a second analog-to-digital converter (ADC2).

Wherein, the low noise amplifier is connected to the antenna module 10 for amplifying the radio frequency signal received by the antenna module 10 while maintaining good noise performance to obtain the first amplified signal.

The first mixing circuit is connected to the low noise amplifier and a phase shifter for frequency shifting the amplified signal and the first phase signal, and further separating the signal and noise to obtain a first mixing signal.

The first low-pass filter is connected to the first mixing circuit, and is used for filtering the first mixing signal to remove noise to obtain the first filtered signal.

The first variable gain amplifier is connected to the first low-pass filter, and is used for amplifying the first filtered signal, and amplifying signals of different amplitudes to different degrees to obtain the second amplified signal.

The second low-pass filter is connected to the first variable gain amplifier, and is used for filtering the second amplified signal to further remove noise to obtain the second filtered signal.

The first analog-to-digital converter is connected between the second low-pass filter and the baseband processing module, and is used for converting the second filtered signal into a fourth digital signal, and sending the fourth digital signal to the baseband processing module.

The second mixing circuit is connected to the low noise amplifier and is connected to a phase shifter for frequency shifting the amplified signal and the second phase signal, and further separating the signal and noise to obtain a second mixing signal.

The third low-pass filter is connected to the second mixing circuit, and is used for filtering the second mixing signal to remove noise to obtain a third filtering signal.

The second variable gain amplifier is connected to the third low-pass filter, and is used for amplifying the third filtered signal, and amplifying the signals of different amplitudes to different degrees to obtain the third amplified signal.

The fourth low-pass filter is connected to the second variable gain amplifier, and is used for filtering the third amplified signal to further remove noise to obtain a fourth filtered signal.

The second analog-to-digital converter is connected between the fourth low-pass filter and the baseband processing module 50 for converting the fourth filtered signal into a fifth digital signal, and sending the fifth digital signal to the baseband processing module 50 .

It should be noted that, in this embodiment of the present invention, since ADC1 and ADC2 are the last modules in the receiving module 30, the first digital signal obtained by processing the radio frequency signal by the receiving module 30 includes the fourth digital signal and the fifth digital signal Signal.

Further, the first saturation detection module 40 includes: a first saturation detection circuit 401 and a second saturation detection circuit 402 . For the structures of the first saturation detection circuit 401 and the second saturation detection circuit 402, please refer to the first embodiment.

Wherein, the input end of the first saturation detection circuit 401 is connected to the two differential signal lines of the output end of the first mixing circuit, and the output end of the first saturation detection circuit 401 is connected to the baseband processing module 50, which is used for the first mixing circuit. The first mixed signal obtained by the frequency circuit is filtered, and the filtered signal is compared with the first preset parameter to obtain a first comparison result, and the first comparison result is output to the baseband processing module 50 .

Specifically, the first saturation detection circuit 401 transmits the received swing amplitude of the first mixing signal to C1 and R1 through M1 and M2, and the low-pass filter composed of C1 and R1 filters the first mixing signal. Only the amplitude signal remains, and then the comparator A1 compares the amplitude signal with the first preset parameter to obtain a first comparison result. The first preset parameter may be the first reference voltage VREF; the first comparison result includes two cases of high level and low level.

The input end of the second saturation detection circuit 402 is connected to the two differential signal lines at the output end of the LPF2, the output end of the second saturation detection circuit 402 is connected to the baseband processing module 50, and the second saturation detection circuit 402 is used to detect the second signal obtained by the LPF2. The filtered signal is filtered, and the filtered signal is compared with the second preset parameter to obtain a second comparison result.

Specifically, the second saturation detection circuit 402 transmits the swing amplitude of the received second filtered signal to C1 and R1 through M1 and M2, and the low-pass filter composed of C1 and R1 filters the second filtered signal, and the filtered signal Only the amplitude signal remains, and then the comparator A1 in the second saturation detection circuit 402 compares the amplitude signal with the second preset parameter to obtain a second comparison result. Wherein, the second preset parameter may be the second reference voltage VREF; the second comparison result includes two cases of high level and low level.

Wherein, the first detection result includes two situations: the first comparison result and the second comparison result.

It should be noted that the saturation detection circuits 401 and 402 are used to detect whether the output of each module reaches a saturation state, and the reference voltage VREF value can be adjusted according to the detected modules; in addition, if the saturation detection module detects the module is in a saturated state, that is, the output of the saturation detection module is a high level, then the saturation detection circuits 401 and 402 transmit the detection results to the baseband processing module 50, and the baseband processing module 50 controls the gain of the first gain management module 80 to the receiving module Make adjustments.

Still further, after the baseband processing module 50 digitizes the detection result and the digital signal to obtain the first processing result, if the detection result is a high level, the gain of the corresponding module needs to be adjusted. Therefore, the first gain management module 80 includes: A plurality of gain adjustment circuits, the plurality of gain adjustment circuits are connected to the baseband processing module 50, and are connected to a low noise amplifier, a first mixing circuit, a first low-pass filter, a first variable gain amplifier and a first analog-to-digital converter, for According to the first detection result and the first processing result, the gains of the low noise amplifier, the first frequency mixing circuit and the first variable gain amplifier are adjusted in sequence. The gain adjustment circuit may be a PLDO circuit.

Specifically, the first processing result includes two cases: first, the first comparison result is a result of digital processing with the first digital signal; second, the second comparison result is a result of digital processing with the first digital signal.

Further, if the output of the first saturation detection circuit 401, that is, the first comparison result, is at a high level, the first gain management module 80 reduces the gains of the LNA and MIX1 according to the first comparison result and the first processing result of the first case. ; If the output of the second saturation detection circuit 402, that is, the second comparison result is a high level, the first gain management module 80 reduces the gain of the PGA1 according to the second comparison result and the first processing result of the second case.

In an actual wireless transceiver, because LNA and MIX1 are often integrated together, the first saturation detection circuit 401 detects the first mixing signal of MIX1, but the first gain management module 80 adjusts the gains of LNA and MIX1; similarly, Because PGA1 and LPF1 are often integrated together, and LPF1 is usually a passive device, the second saturation detection circuit 402 detects the first filtered signal output by LPF1, and the first gain management module 80 adjusts the gain of PGA1.

It should be noted that if the outputs of the first saturation detection circuit 401 and the second saturation detection circuit 402 are both low level, indicating that neither MIX1 nor PGA1 has reached saturation, then the baseband processing module 50 will detect whether the output signals of MIX1 and PGA1 are The minimum requirement for detection by the saturation detection circuit is reached, and if the requirement is met, the increase in gain is stopped.

In addition, the first saturation detection circuit 401 can also be used to detect the output signal of MIX2, the second saturation detection circuit 402 can also be used to detect the output signal that can be used to detect LPF4, and the first gain management module 80 can also be used to adjust the gains of MIX2 and PGA2 .

For the receiving module, the gain adjustable range of LNA is generally -5 to 20 dB, the gain adjustable range of MIX is -10 to 5 dB, and the gain adjustable range of PGA is 0 to 50 dB. Usually the gain step length of the receiver is set to 2dB.

In a specific embodiment, the transmitting module 60 includes sub-modules: a second digital-to-analog converter (DAC2), a fifth low-pass filter (LPF5), an automatic gain control amplifier (AGC), and a third mixer (MIX3) , the sixth low-pass filter (LPF6), the power amplifier (PA).

The second digital-to-analog converter is connected to the baseband processing module 50 for converting the second digital signal generated by the baseband processing module 50 into an analog signal.

The fifth low-pass filter is connected to the second digital-to-analog converter, and is used for filtering the analog signal, removing noise, and obtaining a fifth filtering signal.

The automatic gain control amplifier is connected to the fifth low-pass filter, and is used for amplifying the fifth filtered signal according to the requirements of the baseband processing module 50 to obtain the fourth amplified signal.

The third mixer is connected to the automatic gain control amplifier and to the Fractional-N PLL for frequency shifting the fourth amplified signal and the local oscillation signal, and further separating the signal and noise to obtain a third mixed signal.

The sixth low-pass filter is connected to the third mixer, and is used for filtering the third mixing signal to further remove noise to obtain a sixth filtered signal.

The power amplifier is connected between the sixth low-pass filter and the antenna module 10 for amplifying the signal of the sixth filter to obtain a radio frequency signal for transmission, and transmits the obtained radio frequency signal through the antenna module 10 .

Further, the second saturation detection module 70 includes: a third saturation detection circuit 701 , a fourth saturation detection circuit 702 and a fifth saturation detection circuit 703 . For the structure of the saturation detection circuits 701 , 702 and 703 , please refer to the first embodiment.

The input end of the third saturation detection circuit 701 is connected to the differential signal line of the AGC output end, and the output end is connected to the baseband processing module 50 for filtering the fourth amplified signal generated by the AGC, and combining the filtered signal with the third pre-amplifier signal. Set parameters for comparison, obtain a third comparison result, and output the third comparison result to the baseband processing module 50 .

The input end of the fourth saturation detection circuit 702 is connected to the two differential signal lines at the output end of the LPF6, and the output end is connected to the baseband processing module 50 for filtering the sixth filter signal generated by the LPF6, and then combining the filter signal with the fourth pre-processing module. The parameters are compared to obtain a fourth comparison result, and the third comparison result is output to the baseband processing module 50 .

The input end of the fifth saturation detection module 703 is connected to the output end of the PA, and the output end is connected to the baseband processing module 50 for filtering the radio frequency signal generated by the PA for transmission, and combining the filtered signal with the fifth preset. The parameters must be optimized, the fifth comparison result is obtained, and the third comparison result is output to the baseband processing module 50 .

Specifically, the third preset parameter, the fourth preset parameter and the fifth preset parameter are all reference voltages VREF, and the reference voltages VREF of different saturation detection modules are different.

Specifically, the detection process of the sub-modules in the transmitting module by the saturation detection modules 701 , 702 and 703 is the same as the detection process of the sub-modules in the receiving module by the saturation detection modules 401 and 402 , and details are not repeated here.

Based on the above, the second gain management module 90 includes several gain management circuits, and the several gain management circuits are connected to the baseband processing module 50, and connected to the automatic gain control amplifier, the third mixer and the power amplifier, for use according to the second detection result and the first The second processing results adjust the gain of AGC, MIX3 and PA. Wherein, the second detection result includes the third comparison result, the fourth comparison result and the fifth comparison result. The second processing result includes three cases: first, the third comparison result and the digitized processing result of the second digital signal; second, the fourth comparison result and the digital processing result of the second digital signal; third, the fifth comparison result with the digitized processing result of the second digital signal.

Specifically, after filtering and comparing the fourth amplified signal, the third saturation detection circuit 701 obtains a third comparison result, and the third comparison result includes two cases of high level and low level; when the baseband processing module 50 receives the high level After obtaining the third comparison result, the high-level third comparison result and the second digital signal are digitized to obtain the second processing result, and then the second gain management module 90 reduces the AGC according to the third comparison result and the second processing result gain.

After receiving the high-level fourth comparison result, the baseband processing module 50 performs digital processing on the high-level fourth comparison result and the second digital signal to obtain the second processing result, and then the second gain management module 90 obtains the second processing result according to the fourth comparison result. The comparison result and the second processing result reduce the gain of MIX3.

It should be noted that since the LPF6 after MIX3 is usually a passive device, the second gain management module 90 adjusts the gain of MIX3. Therefore, the fourth saturation detection circuit 702 can also be set between MIX3 and LPF6 to detect the gain of MIX3. The swing of the output signal.

After receiving the high-level fifth comparison result, the baseband processing module 50 performs digital processing on the high-level fifth comparison result and the second digital signal to obtain the second processing result, and then the second gain management module 90 obtains the second processing result according to the fifth comparison result. Comparing the result and the second processing result reduces the gain of the PA.

When the third, fourth, and fifth comparison results are all low levels, it means that AGC, MIX3, and PA have not reached saturation. Then the baseband processing module 50 detects whether the output signals of AGC, MIX3, and PA have reached saturation. The detection circuit performs Detects the minimum requirement, and stops increasing the gain if the requirement is met.

For the transmitter module, the adjustable range of the gain of AGC is 0-50dB, the adjustable range of gain of MIX is -10-5dB, and the gain of PA is 10-40dB. Usually the gain step length of the transmitter is set to 2dB.

For example, the working process of a wireless transceiver based on automatic gain management includes two parts: a receiving phase and a transmitting phase.

In the receiving stage, the receiving module 30 first initializes the gain of each sub-module according to the received radio frequency signal. When the input radio frequency signal is too small (the signal is too small mainly means that the radio frequency signal does not reach the minimum identifiable signal amplitude), first The first gain management module 80 increases the gain of LNA and MIX1, and the first saturation detection circuit 401 detects the output of MIX1 synchronously; if the detection result of the first saturation detection circuit 401 is a high level, the first gain management module 80 reduces the LNA and the gain of MIX1; if the detection result of the first saturation detection circuit 401 is a low level, the gain of the PGA is increased, while the second saturation detection circuit 402 detects the output of the PGA1, if the detection result of the second saturation detection circuit 402 is high level, the first gain management module 80 reduces the gain of the PGA1; the detection result of the second saturation detection circuit 402 is still low, indicating that the output signals of the LNA, MIX1 and PGA1 are all unsaturated, and the baseband processing module 50 Detect whether the output signals of LNA, MIX1 and PGA1 meet the minimum requirements for detection, and stop increasing the gain if they meet the requirements.

In the transmitting stage, the baseband processing module 50 generates the second digital signal for transmission, the transmitting module 60 initializes the gain of each sub-module according to the second digital signal, first the second gain management module 90 increases the gain of the AGC, and the third saturation detection The circuit 701 synchronously detects the swing of the AGC output signal; if the detection result of the third saturation detection circuit 701 is high, the second gain management module 90 reduces the gain of the AGC; if the detection result of the third saturation detection circuit 701 is low level, the second gain management module 90 increases the gain of MIX3, while the fourth saturation detection circuit 703 detects the swing of the output signal of LPF6; if the detection result of the fourth saturation detection circuit 702 is a high level, the second gain The management module 90 reduces the gain of MIX3; if the detection result of the fourth saturation detection circuit 703 is a low level, the second gain management module 90 increases the gain of the PA, while the fifth saturation detection circuit 703 detects the swing of the PA output signal; If the detection result of the fifth saturation detection circuit 703 is a high level, the second gain management module 90 reduces the gain of the PA; if the detection result of the fifth saturation detection circuit 703 is a low level, it means that the AGC, MIX3 and PA The output signals are all in an unsaturated state. At this time, the baseband processing module 50 detects whether the output signals of the AGC, MIX3 and PA meet the minimum detection requirements, and stops increasing the gain if the requirements are met.

In the working process of the above-mentioned wireless transceiver, regardless of the receiving stage or the transmitting stage, the priority order of adjusting the gain of each sub-module is the order of the sub-modules that the signal transmission passes through successively; that is, in the receiving stage, the gains of LNA and MIX1 are adjusted first, Then adjust the gain of PGA1; in the transmitting stage, first adjust the gain of AGC, then adjust the gain of MIX, and finally adjust the gain of PA.

In addition, to adjust the gain step, you can use binary gain adjustment algorithm, or you can use a large step gain of 10dB to adjust and then adjust by a small step gain of 2dB, so that the power consumption and performance of the wireless transceiver can reach the optimal state. .

In the embodiment of the present invention, the gain of each sub-module in the receiving module is adjusted in turn according to the order of signal reception, the gain of each sub-module in the transmitting module is adjusted in turn according to the order of signal transmission, and the receiving module and the transmitting module are adjusted in a certain order. The gain of the module can make the power consumption of the wireless transceiver change in an orderly manner and keep its performance at an optimal value.

The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (9)

1. a kind of saturation detection circuit characterized by comprising first switch (S1), second switch (S2), the first metal-oxide-semiconductor (M1), the second metal-oxide-semiconductor (M2), capacitor (C1), resistance (R1) and comparator (A1), wherein

The first end of the first switch (S1) is connected to first input end, and the second end of the first switch (S1) is connected to The grid of the drain electrode of one metal-oxide-semiconductor (M1) and second metal-oxide-semiconductor (M2)；

The first end of the second switch (S2) is connected to the second input terminal, and the second end of the second switch (S2) is connected to institute State the drain electrode of the second metal-oxide-semiconductor (M2) and the grid of first metal-oxide-semiconductor (M1)；

The source electrode of first metal-oxide-semiconductor (M1) connects the source electrode of second metal-oxide-semiconductor (M2), and is connected to the comparator (A1) input terminal；

One end of the capacitor (C1) is connect with the source electrode of the source electrode of first metal-oxide-semiconductor (M1) and second metal-oxide-semiconductor (M2), And it is connected to the input terminal of the comparator, the other end ground connection of the capacitor (C1)；

One end of the resistance (R1) is connect with the source electrode of the source electrode of first metal-oxide-semiconductor (M1) and second metal-oxide-semiconductor (M2), And it is connected to the input terminal of the comparator, the other end ground connection of the resistance (R1).

2. a kind of transceiver based on automatic gain management characterized by comprising

Anneta module (10), for receiving and emitting radiofrequency signal；

Frequency synthesis module (20), for providing local oscillated signal；

Receiving module (30) carries out amplified signal and the local oscillated signal for amplifying to the radiofrequency signal Mixing, then by the signal after mixing after filtering, amplification and analog-to-digital conversion, obtains the first digital signal；

First saturation detection module (40) obtains simultaneously for detecting to the amplitude of oscillation of the receiving module (30) output signal The first testing result is exported, wherein the first saturation detection module (40) includes that at least one is as described in claim 1 full And detection circuit；

Baseband processing module (50) is obtained for carrying out digital processing to first testing result and first digital signal First processing result, and the second digital signal for transmitting is generated, while providing third for the frequency synthesis module (20) Digital signal is to generate the local oscillated signal；

Transmitting module (60), for carrying out digital-to-analogue conversion, filtering and amplification to second digital signal, by amplified signal It is mixed with the local oscillated signal, after then the signal after mixing is filtered and is amplified, obtains the radio frequency letter Number；

Second saturation detection module (70) obtains simultaneously for detecting to the amplitude of oscillation of the transmitting module (60) output signal The second testing result is exported to the baseband processing module (50), the baseband processing module (50) is to second testing result Digitized processing is carried out with second digital signal, obtains second processing as a result, wherein the second saturation detection module It (70) include at least one saturation detection circuit as described in claim 1.

3. the transceiver as claimed in claim 2 based on automatic gain management, which is characterized in that further include:

First gain management module (80) is used for according to first testing result and first processing result to the reception The gain of module (30) is adjusted；

Second gain management module (90) is used for according to second testing result and the second processing result to the transmitting The gain of module (60) is adjusted.

4. the transceiver as claimed in claim 3 based on automatic gain management, which is characterized in that the receiving module (30) include:

Low-noise amplifier obtains the first amplified signal for amplifying to the radiofrequency signal；

First mixting circuit, for will first amplified signal and first phase signal progress frequency translation, obtain the One mixed frequency signal；

First low-pass filter obtains the first filtering signal for being filtered to first mixed frequency signal；

First variable gain amplifier obtains the second amplified signal for amplifying to first filtering signal；

Second low-pass filter obtains the second filtering signal for being filtered to second amplified signal；

First analog-digital converter, for second filtering signal to be converted to the 4th digital signal；

Second mixting circuit obtains the second mixing letter for the amplified signal and second phase signal to be carried out frequency translation Number；

Third low-pass filter obtains third filtering signal for being filtered to second mixed frequency signal；

Second variable gain amplifier obtains third amplified signal for amplifying to the third filtering signal；

4th low-pass filter obtains the 4th filtering signal for being filtered to second amplified signal；

Second analog-digital converter, for being converted to the 5th digital signal to the 4th filtering signal.

5. the transceiver as claimed in claim 4 based on automatic gain management, which is characterized in that the first saturation inspection Surveying module (40) includes:

First saturation detection circuit (401), for being filtered to first mixed frequency signal and by filtered signal and One parameter preset is compared, and obtains the first comparison result；

Second saturation detection circuit (402), for being filtered to second filtering signal and by filtered signal and Two parameter presets are compared, and obtain the second comparison result.

6. the transceiver as claimed in claim 4 based on automatic gain management, which is characterized in that first gain tube Module (80) are managed to be used for according to first testing result and first processing result successively to the low-noise amplifier, institute The gain for stating the first mixting circuit and first variable gain amplifier is adjusted.

7. the transceiver as claimed in claim 3 based on automatic gain management, which is characterized in that the transmitting module (60) include:

Second digital analog converter, for second digital signal to be converted to analog signal；

5th low-pass filter obtains the 5th filtering signal for being filtered to the analog signal；

Automatic gain control amplifier obtains the 4th amplified signal for amplifying the 5th filtering signal；

Third frequency mixer obtains third for carrying out frequency translation to the 4th amplified signal and the local oscillated signal Mixed frequency signal；

6th low-pass filter obtains the 6th filtering signal for being filtered to the third mixed frequency signal；

Power amplifier obtains the radiofrequency signal for transmitting for amplifying to the 6th filtering signal.

8. the transceiver as claimed in claim 7 based on automatic gain management, which is characterized in that the second saturation inspection Surveying module (70) includes:

Third saturation detection circuit (701), for being filtered to the 4th amplified signal and by filtered signal and Three parameter presets are compared, and obtain third comparison result；

4th saturation detection circuit (702), for being filtered to the 6th filtering signal and by filtered signal and Four parameter presets are compared, and obtain the 4th comparison result；

5th saturation detection circuit (703), for being filtered to the radiofrequency signal of transmitting and by filtered signal It is compared with the 5th parameter preset, obtains the 5th comparison result.

9. the transceiver as claimed in claim 7 based on automatic gain management, which is characterized in that second gain tube Reason module (90) is for successively putting the automatic growth control according to second testing result and the second processing result The gain of big device, the third frequency mixer and the power amplifier is adjusted.