CN110048738B - Saturation detection circuit and wireless transceiver based on automatic gain management - Google Patents
Saturation detection circuit and wireless transceiver based on automatic gain management Download PDFInfo
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- CN110048738B CN110048738B CN201910315019.8A CN201910315019A CN110048738B CN 110048738 B CN110048738 B CN 110048738B CN 201910315019 A CN201910315019 A CN 201910315019A CN 110048738 B CN110048738 B CN 110048738B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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 comprises: the device comprises an antenna module, a frequency synthesis module, a receiving module, a first saturation detection module, a baseband processing module, a transmitting module and a second saturation detection module. The wireless transceiver based on automatic gain management detects the swing amplitude of the output signals of the receiving module and the transmitting module by arranging the saturation detection module, and adjusts the gains of the receiving module and the transmitting module in time, so that the power consumption of the wireless transceiver is reduced in time, and the power consumption and the performance of the wireless transceiver reach optimal values.
Description
Technical Field
The invention belongs to the field of radio frequency circuits, and particularly relates to a saturation detection circuit and a wireless transceiver based on automatic gain management.
Background
In the information age today, people have taken the transfer and interaction of information as an essential component of social life. Among them, wireless communication is the most active part of the communication field, and is widely used in various aspects.
With the increasing demand of radio frequency applications and the continuous innovation of advanced CMOS manufacturing processes, wireless transceivers need to meet the demanding requirements of communication systems during design. For example: along with the difference of the radio frequency signals received by the wireless transceiver, the overall gain of the wireless transceiver is different; however, the wireless transceiver has a plurality of modules capable of realizing gain to realize the overall gain of the wireless transceiver, and under different environments, the gain adjustable range of each module is required to be different.
However, when the current wireless transceiver is designed, the swing of each module of the wireless transceiver cannot be detected in real time, so that the gain of the wireless transceiver cannot be adjusted in time, the power consumption of the wireless transceiver is large, and the overall performance of the wireless transceiver is poor.
Disclosure of Invention
In order to solve the above problems 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 invention is realized by the following technical scheme:
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,
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 electrode of the first MOS tube and the grid electrode of the second MOS tube;
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 electrode of the second MOS tube and the grid electrode of the first MOS tube;
the source electrode of the first MOS tube is connected with the source electrode of the second MOS tube and is connected to the input end of the comparator;
one end of the capacitor is connected with the source electrode of the first MOS tube and the source electrode of the second MOS tube 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 with the source electrode of the first MOS tube and the source electrode of the second MOS tube 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 an automatic gain management-based wireless transceiver, including:
an antenna module for receiving and transmitting radio frequency signals;
a frequency synthesis module for providing a local oscillation signal;
the receiving module is used for amplifying the radio frequency signal, mixing the amplified signal with the local oscillation signal, and then filtering, amplifying and performing analog-to-digital conversion on the mixed signal to obtain a first digital signal;
the first saturation detection module is configured to detect a swing of an output signal of the receiving module, to obtain and output a first detection result, where the first saturation detection module includes at least one saturation detection circuit provided in an embodiment of the present invention;
a baseband processing module, configured to perform digital processing on the first detection result and the first digital signal to obtain a first processing result, generate a second digital signal for transmission, and provide a third digital signal for the frequency synthesis module to generate the local oscillation signal;
the transmitting module is used for performing digital-to-analog conversion, filtering and amplification on the second digital signal, mixing the amplified signal with the local oscillation signal, and then filtering and amplifying the mixed signal to obtain the radio-frequency signal;
the second saturation detection module is configured to detect a swing of a signal output by the transmission module, obtain and output a second detection result to the baseband processing module, and the baseband processing module performs digital processing on the second detection result and the second digital signal to obtain a second processing result, where the second saturation detection module includes at least one saturation detection circuit as provided in the embodiment of the present invention.
In one embodiment of the present invention, further comprising:
a first gain management module, configured to adjust a gain of the receiving module according to the first detection result and the first processing result;
and the second gain management module is used for adjusting the gain of the transmitting module according to the second detection result and the second processing result.
In one embodiment of the present invention, the receiving module includes:
the low-noise amplifier is used for amplifying the radio-frequency signal to obtain a first amplified signal;
the first mixing circuit is used for carrying out frequency shifting on the first amplified signal and the first phase signal to obtain a first mixing signal;
the first low-pass filter is used for filtering the first mixing signal to obtain a first filtering signal;
the first variable gain amplifier is used for amplifying the first filtering signal to obtain a second amplifying signal;
the second low-pass filter is used for filtering 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;
the second mixing circuit is used for carrying out frequency shifting on the amplified signal and the second phase signal to obtain a second mixing signal;
the third low-pass filter is used for filtering the second mixing signal to obtain a third filtering signal;
the second variable gain amplifier is used for amplifying the third filtered signal to obtain a third amplified signal;
the fourth low-pass filter is used for filtering the second amplified signal to obtain a fourth filtered signal;
and the second analog-to-digital converter is used for converting the fourth filtered signal into a fifth digital signal.
In one embodiment of the present invention, the first saturation detection module includes:
the first saturation detection circuit is used for filtering the first mixing signal and comparing the filtered signal with a first preset parameter to obtain a first comparison result;
and the second saturation detection circuit is used for filtering the second filtering signal and comparing 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 adjust gains of the low noise amplifier, the first mixer circuit, and the first variable gain amplifier according to the first detection result and the first processing result.
In one embodiment of the invention, the transmission module comprises:
a second digital-to-analog converter for converting the second digital signal to an analog signal;
the fifth low-pass filter is used for filtering the analog signal to obtain a fifth filtered signal;
the automatic gain control amplifier is used for amplifying the fifth filtering signal to obtain a fourth amplifying signal;
the third mixer is used for carrying out frequency shifting on the fourth amplified signal and the local oscillation signal to obtain a third mixing signal;
a sixth low-pass filter, configured to filter the third mixing signal to obtain a sixth filtered signal;
and the power amplifier is used for amplifying the sixth filtered signal to obtain the radio-frequency signal for transmission.
In one embodiment of the present invention, the second saturation detection module includes:
the third saturation detection circuit is used for filtering the fourth amplified signal and comparing the filtered signal with a third preset parameter to obtain a third comparison result;
the fourth saturation detection circuit is used for filtering the sixth filtered signal and comparing the filtered signal with a fourth preset parameter to obtain a fourth comparison result;
and the fifth saturation detection circuit is used for filtering the radio-frequency signal for transmission and comparing the filtered signal with a 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 adjust gains of the agc amplifier, the third mixer, and the power amplifier according to the second detection result and the second processing result.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the saturation detection module is arranged to detect the swing amplitudes of the signals output by the receiving module and the transmitting module, the detection result is sent to the baseband processing module, and the gains of the receiving module and the transmitting module are adjusted in time, so that the power consumption of the wireless transceiver is reduced in time, and the power consumption and the performance of the wireless transceiver reach optimal values.
2. The gain of each sub-module in the receiving module is adjusted in sequence according to the signal receiving sequence, the gain of each sub-module in the transmitting module is adjusted in sequence according to the signal transmitting sequence, and the gains of the receiving module and the transmitting module are adjusted in a certain sequence, so that the power consumption of the wireless transceiver can be changed orderly, and the performance of the wireless transceiver can be kept at an optimal value.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a saturation detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a wireless transceiver based on automatic gain management according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another wireless transceiver based on automatic gain management according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a saturation detection circuit according to an embodiment of the present invention, where the saturation detection circuit includes: the circuit comprises a first switch S1, a second switch S2, a first MOS switch M1, a second MOS transistor M2, a capacitor C1, a resistor R1 and a comparator A1.
A first terminal of the first switch S1 is connected to the first input terminal, and a second terminal 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 end of the second switch S2 is connected to the second input end, 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 to the input of the comparator a 1.
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 terminal 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.
As can be seen from the connection relationship of the above components, 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 all connected to the input terminal of the comparator a 1.
When saturation detection of an output signal of the wireless transceiver is performed, a first end of a first switch S1 is connected to a first input end, the first input end is any one of two differential signal lines in a receiving module or a transmitting module of the wireless transceiver, and a first end of a first switch S1 is connected to any one of two differential signals; a first end of the second switch S2 is connected to a second input end, the second input end is the other of the two differential signal lines in the receiving module or the transmitting module of the wireless transceiver, and the other end of 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 a baseband processing module in the wireless transceiver, and the comparator A1 sends the result of the comparison to the baseband processing module for processing.
Specifically, during testing, 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 for transmitting the swing of the output signal of the receiving module or the transmitting module, where the swing of the output signal refers to the amplitude of a sine wave; the capacitor C1 and the resistor R1 jointly form a low-pass filter, the low-pass filter filters high-frequency signals in the signals transmitted by the M1 and the M2, and only amplitude signals are left in output signals after filtering; then the amplitude signal enters a comparator a1, the comparator a1 compares the amplitude signal with a reference voltage VERF to obtain a comparison result, and the comparison result is output to a baseband processing module for processing.
Furthermore, the ranges of the reference voltage VERF values of different modules are different, and the reference voltage VERF values can be adjusted according to the requirements 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 terminal of the comparator a1 is at a high level, the saturation detection circuit detects that the result of the module to be detected is saturated for the detected module; when the output at the output of comparator a1 is low, then the saturation detection circuit detects that the result is not saturated for the detected block.
The saturation detection circuit of the invention filters the output signals of each module and then compares the output signals by adopting the comparator, and the detection method is easy to operate and can not influence the work of the wireless transceiver.
Example two
Referring to fig. 2, fig. 2 is a schematic structural diagram of a wireless transceiver based on automatic gain management according to an embodiment of the present invention, including: the antenna module 10, the frequency synthesis module 20, the receiving module 30, the 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, where the signal receiving module is configured to receive a radio frequency signal, and the signal transmitting module is configured to transmit a radio frequency signal.
The frequency synthesis module 20 is used to provide a local oscillation signal.
The receiving module 30 is connected to the antenna module 10 and the frequency synthesizing module 20, respectively, and the receiving module 30 is configured to amplify a radio frequency signal, mix the amplified signal with a local oscillation signal, and filter, amplify, and perform analog-to-digital conversion on the mixed signal to obtain a first digital signal.
The first saturation detection module 40 is configured to detect a swing of the signal output by the receiving module 30 to obtain a first detection result, and output the first detection result; 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, one end (input end) of the second switch S2 is connected to the other one of the two differential signal lines in the receiving module 30, and 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, i.e., a high level and a 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 to 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 configured to perform digital processing on a first detection result output by the first saturation detection module 40 and a first digital signal output by the receiving module 30 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 further configured to provide the third digital signal to the frequency synthesis module 20 to enable the frequency synthesis module 20 to generate the local oscillation signal.
The transmitting module 60 is connected to the frequency synthesizing module 20 and the baseband processing module 50, respectively, and is configured to perform digital-to-analog conversion, filtering and amplification on the second digital signal, perform frequency mixing on the amplified signal and the local oscillation signal, then filter and amplify the frequency-mixed signal to obtain a radio frequency signal for transmission, and transmit the radio frequency signal for transmission through the antenna module 10.
The second saturation detection module 70 is configured to detect a swing of the signal output by the transmission 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 performs digital processing on the second detection result and the second digital signal to obtain a second processing result; the second saturation detection module 70 includes at least one saturation detection circuit, and the structure of the saturation detection circuit is shown in the first embodiment; in 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 transmission 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 transmission module 60, and the output end of the comparator a1 in each saturation detection circuit is connected to the baseband processing module 50. The second detection result also includes both the high level and the low level.
Specifically, the wireless transceiver mainly includes two stages: a receiving stage and a transmitting stage, wherein the receiving stage and the transmitting stage can be carried out simultaneously or not; therefore, the detection of the swing of the output signal of the receiving module 30 by the first saturation detecting module 40 and the detection of the swing of the output signal of the transmitting module 60 by the second saturation detecting module 70 may be performed at the same time or at different times, that is, the saturation detection of the transmitting module and the saturation detection of the receiving module are not affected by each other.
According to the invention, the first saturation detection module is arranged in the receiving module of the wireless transceiver, the second saturation detection module is arranged in the transmitting module, the swing amplitudes of output signals of the receiving module and the transmitting module are detected through the saturation detection module, and the gains of the receiving module and the transmitting module are adjusted, so that the power consumption of the wireless transceiver is reduced in time, and the power consumption and the performance of the wireless transceiver reach optimal values.
In a particular embodiment, the automatic gain management based wireless transceiver further comprises 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 a 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 the baseband processing module 50 receives the first detection result, the first detection result and the first digital signal are processed comprehensively to obtain a 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 low level, the baseband processing module 50 detects whether the signal output by the receiving module meets the minimum requirement of detection according to the first processing result, and stops increasing the gain if the signal output by the receiving module meets the requirement.
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 transmitter module according to the second processing result; when the second detection result is low level, the baseband processing module 50 detects whether the signal output by the transmitting module meets the minimum requirement of detection according to the second processing result, and stops increasing the gain if the signal output by the transmitting module meets the requirement.
According to the invention, the saturation detection module is arranged to detect the swing amplitudes of the signals output by the receiving module and the transmitting module, the detection result is sent to the baseband processing module, and the gains of the receiving module and the transmitting module are adjusted in time, so that the power consumption of the wireless transceiver is reduced in time, and the power consumption and the performance of the wireless transceiver reach optimal values.
EXAMPLE III
Referring to fig. 3, fig. 3 is a schematic structural diagram of another wireless transceiver based on automatic gain management according to an embodiment of the present invention.
In one particular embodiment, the frequency synthesis module 20 includes a first digital-to-analog converter (DAC1), a voltage controlled crystal oscillator (VCXO), and a Fractional division phase locked loop (Fractional-N P LL).
The first digital-to-analog converter is connected to the baseband processing module 50, and is configured to convert a third digital signal generated by the baseband processing module 50 into a static voltage signal; the voltage-controlled crystal oscillator is connected with the first digital-to-analog converter and used for generating a stable reference clock according to the static voltage signal; the decimal frequency division phase-locked loop is connected with the voltage-controlled crystal oscillator and used for generating a stable local oscillation signal according to the reference clock.
Further, the frequency synthesis module 20 further includes: and a phase shifter connected between the fractional pll and the receiving module 30 for adjusting a phase of the local oscillation signal to generate a first phase signal and a second phase signal.
Specifically, the signals generated by the Fractional-N P LL are differential signals of 0 degree and 180 degrees, the receiving module 30 includes an I path and a Q path, the I path requires local oscillator signals of 0 degree and 180 degrees, and the Q path requires local oscillator signals of 90 degrees and 270 degrees, therefore, a phase shifter is required to generate signals required by the I path and the Q path, wherein the first phase signal refers to one of the signals required by the I path and the Q path, the second phase signal refers to the other one of the signals required by the I path and the Q path, and further, the type of the phase shifter is 0/90.
Further, the DACs 1, VCXO and Fractional-N P LL in the frequency synthesizing module 20 may be 1 each, which are sequentially connected to the receiving module 30 and the transmitting module 60 to provide both the local oscillation signal to the receiving module 30 and the local oscillation signal to the transmitting module 60. in addition, the DACs 1, VCXO and Fractional-N P LL providing the local oscillation signal to the receiving module 30 may be different from the DACs 1, VCXO and Fractional-NP LL providing the local oscillation signal to the transmitting module 60, i.e., there is a set of DACs 1, VCXO and Fractional-N P LL sequentially connected to the receiving module 30, while there is another set of DACs 1, VCXO and Fractional-N P LL sequentially connected to the transmitting module 60.
In a specific embodiment, the receiving module 30 includes sub-modules of a low noise amplifier (L NA), a first mixer circuit (MIX1), a first low pass filter (L PF1), a first variable gain amplifier (PGA1), a second low pass filter (L PF2), a first analog-to-digital converter (ADC1), a second mixer circuit (MIX2), a third low pass filter (L PF3), a second variable gain amplifier (PGA2), a fourth low pass filter (L PF4), and a second analog-to-digital converter (ADC 2).
The low noise amplifier is connected to the antenna module 10, and configured to amplify a radio frequency signal received by the antenna module 10, and maintain good noise performance to obtain a first amplified signal.
The first mixing circuit is connected with the low-noise amplifier and the phase shifter and is used for carrying out frequency shift on the amplified signal and the first phase signal and further separating the signal from noise to obtain a first mixing signal.
The first low-pass filter is connected with the first mixing circuit and used for filtering the first mixing signal and removing noise to obtain a first filtering signal.
The first variable gain amplifier is connected with the first low-pass filter and used for amplifying the first filtering signal and amplifying the signals with different amplitudes to different degrees to obtain a second amplified signal.
The second low-pass filter is connected with the first variable gain amplifier and is used for filtering the second amplified signal and further removing noise to obtain a second filtered signal.
The first analog-to-digital converter is connected between the second low-pass filter and the baseband processing module and used for converting the second filtering signal into a fourth digital signal and sending the fourth digital signal to the baseband processing module.
The second mixing circuit is connected with the low-noise amplifier and the phase shifter and is used for carrying out frequency shift on the amplified signal and the second phase signal and further separating the signal from noise to obtain a second mixing signal.
The third low-pass filter is connected with the second mixing circuit and used for filtering the second mixing signal and removing noise to obtain a third filtering signal.
The second variable gain amplifier is connected with the third low-pass filter and used for amplifying the third filtered signal and amplifying the signals with different amplitudes to different degrees to obtain a third amplified signal.
And the fourth low-pass filter is connected with the second variable gain amplifier and is used for filtering the third amplified signal and further removing 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, and is configured to convert the fourth filtered signal into a fifth digital signal and send the fifth digital signal to the baseband processing module 50.
In this embodiment of the present invention, since the ADC1 and the 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.
Further, the first saturation detection module 40 includes: a first saturation detection circuit 401 and a second saturation detection circuit 402. The first saturation detection circuit 401 and the second saturation detection circuit 402 are configured as in the first embodiment.
An input end of the first saturation detection circuit 401 is connected to the two differential signal lines at the output end of the first frequency mixing circuit, and an output end of the first saturation detection circuit 401 is connected to the baseband processing module 50, and is configured to filter the first frequency mixing signal obtained by the first frequency mixing circuit, compare the filtered signal with a first preset parameter to obtain a first comparison result, and output the first comparison result to the baseband processing module 50.
Specifically, the first saturation detection circuit 401 transfers the swing of the received first mixing signal to the low-pass filter composed of C1 and R1 through M1 and M2, and the C1 and R1 filter the first mixing signal, and the filtered signal only has an amplitude signal, and then the comparator a1 compares the amplitude signal with a first preset parameter to obtain a first comparison result. The first preset parameter may be a first reference voltage VREF; the first comparison result includes both a high level and a 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 L PF2, 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 configured to filter a second filtered signal obtained from L PF2, and compare the filtered signal with a second preset parameter, so as to obtain a second comparison result.
Specifically, the second saturation detection circuit 402 transfers the swing of the received second filtered signal to the low-pass filter composed of C1 and R1 through M1 and M2, and the C1 and R1 filter the second filtered signal, and the filtered signal only has an amplitude signal, and then the comparator a1 in the second saturation detection circuit 402 compares the amplitude signal with a second preset parameter to obtain a second comparison result. The second preset parameter may be a second reference voltage VREF; the second comparison result includes both a high level and a low level.
The first detection result comprises two conditions of a first comparison result and a 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 thereof may be adjusted according to the detected module; in addition, if the saturation detection module detects that the module is in a saturation state, i.e. the output of the saturation detection module is at a high level, the saturation detection circuits 401 and 402 transmit the detection result to the baseband processing module 50, and the baseband processing module 50 controls the first gain management module 80 to adjust the gain of the receiving module.
Still further, after the baseband processing module 50 performs digital processing on the detection result and the digital signal to obtain a first processing result, if the detection result is a high level, the gain of the corresponding module needs to be adjusted, and therefore, the first gain management module 80 includes a plurality of gain adjusting circuits, which are connected to the baseband processing module 50 and connected to the low noise amplifier, the first mixer circuit, the first low pass filter, the first variable gain amplifier, and the first analog-to-digital converter, and are configured to sequentially adjust the gains of the low noise amplifier, the first mixer circuit, and the first variable gain amplifier according to the first detection result and the first processing result.
Specifically, the first processing result includes two cases: firstly, a first comparison result and a result of the digital processing of the first digital signal are obtained; second, the second comparison result and the first digital signal are processed digitally.
Further, if the output of the first saturation detection circuit 401, i.e., the first comparison result, is high, the first gain management block 80 decreases the gains of L NA and MIX1 according to the first comparison result and the first processing result of the first case, and if the output of the second saturation detection circuit 402, i.e., the second comparison result, is high, the first gain management block 80 decreases the gain of PGA1 according to the second comparison result and the first processing result of the second case.
In an actual wireless transceiver, the first saturation detection circuit 401 detects the first mixed signal of MIX1 because L NA and MIX1 tend to be integrated together, but the first gain management module 80 adjusts the gains of L NA and MIX1, and similarly, the second saturation detection circuit 402 detects L PF1 output first filtered signal because PGAs 1 and L PF1 tend to be integrated together and L PF1 is typically a passive device, and the first gain management module 80 adjusts the gain of PGA 1.
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, which indicates that both MIX1 and PGA1 do not reach saturation, the baseband processing module 50 detects whether the output signals of MIX1 and PGA1 reach the minimum requirement for detection by the saturation detection circuit, and if so, stops increasing the gain.
In addition, the first saturation detection circuit 401 may be further configured to detect an output signal of MIX2, the second saturation detection circuit 402 may be further configured to detect an output signal of L PF4, and the first gain management module 80 may be further configured to adjust gains of MIX2 and PGA 2.
For the receiving module, the gain adjustable range of L NA is generally-5-20 dB, the gain adjustable range of MIX is-10-5 dB, the gain adjustable range of PGA is 0-50 dB, and the gain step length of the receiver is generally set to be 2 dB.
In a specific embodiment, the transmission module 60 includes sub-modules of a second digital-to-analog converter (DAC2), a fifth low pass filter (L PF5), an automatic gain control Amplifier (AGC), a third mixer (MIX3), a sixth low pass filter (L PF6), and a Power Amplifier (PA).
The second digital-to-analog converter is connected to the baseband processing module 50, and is configured to convert the second digital signal generated by the baseband processing module 50 into an analog signal.
And the fifth low-pass filter is connected with the second digital-to-analog converter and used for filtering the analog signal and removing noise to obtain a fifth filtered signal.
The automatic gain control amplifier is connected to the fifth low-pass filter, and is configured to amplify the fifth filtered signal according to a requirement of the baseband processing module 50, so as to obtain a fourth amplified signal.
The third mixer is connected with the automatic gain control amplifier and connected with Fractional-N P LL, and is used for carrying out frequency shift on the fourth amplified signal and the local oscillation signal, and further separating the signal from noise to obtain a third mixing signal.
The sixth low-pass filter is connected with the third mixer and is used for filtering the third mixing signal and further removing noise to obtain a sixth filtering signal.
The power amplifier is connected between the sixth low-pass filter and the antenna module 10, and is configured to amplify the sixth filter signal to obtain a radio frequency signal for transmission, and transmit 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. The structures of the saturation detection circuits 701, 702, and 703 are shown in the first embodiment.
The input end of the third saturation detection circuit 701 is connected to the differential signal line at the output end of the AGC, and the output end is connected to the baseband processing module 50, and is configured to filter a fourth amplified signal generated by the AGC, compare the filtered signal with a third preset parameter to 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 L PF6, and the output end is connected to the baseband processing module 50, and is configured to filter the sixth filtered signal generated by the L PF6, compare the filtered signal with a fourth preset parameter to obtain a fourth comparison result, and output the third comparison result 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, and is configured to filter the radio frequency signal generated by the PA for transmission, perform a good comparison between the filtered signal and a fifth preset parameter, obtain a fifth comparison result, and output the third comparison result 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 saturation detection modules 701, 702, and 703 on the emission module and the detection process of the saturation detection modules 401 and 402 on the reception module are the same, and are not described herein again.
As mentioned above, the second gain management module 90 includes a plurality of gain management circuits, and the plurality of gain management circuits are connected to the baseband processing module 50, and connected to the AGC, the third mixer and the power amplifier, and are configured to adjust the gains of the AGC, the MIX3 and the PA according to the second detection result and the second processing result. And the second detection result comprises a third comparison result, a fourth comparison result and a fifth comparison result. The second processing result includes three cases: the first and third comparison results and the result of the digital processing of the second digital signal; second, the fourth comparison result and the result of the digital processing of the second digital signal; third, the fifth comparison result is compared with the result of the digital processing of the second digital signal.
Specifically, the third saturation detection circuit 701 performs filtering comparison on the fourth amplified signal to obtain a third comparison result, where the third comparison result includes two cases, namely a high level and a low level; when the baseband processing module 50 receives the third comparison result of the high level, the third comparison result of the high level and the second digital signal are digitally processed to obtain a second processing result, and then the second gain management module 90 reduces the gain of the AGC according to the third comparison result and the second processing result.
When the baseband processing module 50 receives the fourth comparison result with high level, the fourth comparison result with high level and the second digital signal are digitized to obtain a second processing result, and then the second gain management module 90 reduces the gain of MIX3 according to the fourth comparison result and the second processing result.
It should be noted that since L PF6 after MIX3 is usually a passive device, the second gain management module 90 adjusts the gain of MIX3, and therefore, the fourth saturation detection circuit 702 may also be disposed between MIX3 and L PF6 to detect the swing of the output signal of MIX 3.
When the baseband processing module 50 receives the fifth comparison result of high level, the fifth comparison result of high level and the second digital signal are digitized to obtain a second processing result, and then the second gain management module 90 reduces the gain of the PA according to the fifth comparison result and the second processing result.
When the third, fourth and fifth comparison results are all low level, which indicates that neither AGC, MIX3 nor PA is saturated, the baseband processing module 50 detects whether the output signals of AGC, MIX3 and PA meet the minimum requirement for detection by the saturation detection circuit, and stops increasing the gain if the output signals meet the requirement.
For a transmitting module, the gain adjustable range of AGC is 0-50 dB, the gain adjustable range of MIX is-10-5 dB, and the gain of PA is 10-40 dB. The gain step length of the transmitter is typically set to 2 dB.
For example, the operation of an automatic gain management based wireless transceiver includes two parts: a receive phase and a transmit phase.
In the receiving stage, the receiving module 30 first initializes the gain of each sub-module according to the received rf signal, when the input rf signal is too small (the too small signal mainly means that the rf signal does not reach the minimum amplitude of the recognizable signal), the first gain management module 80 first increases L NA and MIX1 gains, and the first saturation detection circuit 401 synchronously detects the output of MIX1, if the detection result of the first saturation detection circuit 401 is high, the first gain management module 80 decreases 23 NA and MIX1 gains, if the detection result of the first saturation detection circuit 401 is low, the gain of PGA is increased, and the second saturation detection circuit 402 detects the output of PGA1, if the detection result of the second saturation detection circuit 402 is high, the first gain management module 80 decreases the gain of PGA1, and the detection result of the second saturation detection circuit 402 is still low, which indicates that L NA, MIX1 and PGA 25 output signals are all in an unsaturated state, and at this time, the baseband processing module 50 detects whether NA, MIX1 and MIX1 reach the minimum required gain increase of PGA1 gain, and if the minimum detection gain of PGA is increased.
In the transmitting stage, the baseband processing module 50 generates a 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 AGC, the third saturation detection circuit 701 synchronously detects the swing of an AGC output signal, if the detection result of the third saturation detection circuit 701 is a high level, the second gain management module 90 decreases the gain of AGC, if the detection result of the third saturation detection circuit 701 is a low level, the second gain management module 90 increases the gain of MIX3, and simultaneously the fourth saturation detection circuit 703 detects L the swing of an output signal of PF6, if the detection result of the fourth saturation detection circuit 702 is a high level, the second gain management module 90 decreases 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 PA, and simultaneously the fifth saturation detection circuit 703 detects the swing of the PA output signal, and if the detection result of the swing of the fifth saturation detection circuit 703 is a high level, the second gain management module 90 increases the gain of the PA output signal of the PA 703 and the detection result of the PA reaches a minimum detection requirement of the detection circuit 3, and the detection result of the detection of the PA 703 indicates that the detection of the detection circuit 703 is a minimum detection of the PA 703.
In the working process of the wireless transceiver, the priority order of adjusting the gain of each sub-module is the order of the sub-modules through which signals pass in sequence no matter in the receiving stage or the transmitting stage, namely in the receiving stage, the gains of L NA and MIX1 are adjusted firstly, then the gain of PGA1 is adjusted, in the transmitting stage, the gain of AGC is adjusted firstly, then the gain of MIX is adjusted, and finally the gain of PA is adjusted.
In addition, the step of adjusting the gain can adopt a binary gain adjustment algorithm, or can adopt a large step gain of 10dB for adjustment and then adopt a small step gain of 2dB for adjustment, so that the power consumption and the performance of the wireless transceiver reach the optimal state.
The embodiment of the invention can ensure that the power consumption of the wireless transceiver is orderly changed and the performance of the wireless transceiver is kept at the optimal value by sequentially adjusting the gains of all the sub-modules in the receiving module according to the signal receiving sequence, sequentially adjusting the gains of all the sub-modules in the transmitting module according to the signal transmitting sequence and adjusting the gains of the receiving module and the transmitting module according to a certain sequence.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A wireless transceiver based on automatic gain management, comprising:
an antenna module (10) for receiving and transmitting radio frequency signals;
a frequency synthesis module (20) for providing a local oscillator signal;
the receiving module (30) is used for amplifying the radio frequency signal, mixing the amplified signal with the local oscillation signal, and then filtering, amplifying and performing analog-to-digital conversion on the mixed signal to obtain a first digital signal;
the first saturation detection module (40) is configured to detect a swing of an output signal of the receiving module (30), to obtain and output a first detection result, where the first saturation detection module (40) includes at least one saturation detection circuit;
a baseband processing module (50) for performing digital processing on the first detection result and the first digital signal to obtain a first processing result, generating a second digital signal for transmission, and providing a third digital signal for the frequency synthesis module (20) to generate the local oscillation signal;
the transmitting module (60) is used for performing digital-to-analog conversion, filtering and amplification on the second digital signal, mixing the amplified signal with the local oscillation signal, and then filtering and amplifying the mixed signal to obtain the radio-frequency signal;
a second saturation detection module (70) configured to detect a swing of a signal output by the transmission module (60), obtain a second detection result, and output the second detection result to the baseband processing module (50), where the baseband processing module (50) performs digital processing on the second detection result and the second digital signal, so as to obtain a second processing result, where the second saturation detection module (70) includes at least one saturation detection circuit;
a first gain management module (80) for adjusting the gain of the receiving module (30) according to the first detection result and the first processing result;
a second gain management module (90) for adjusting the gain of the transmitting module (60) according to the second detection result and the second processing result;
wherein the saturation detection circuit comprises: a first switch (S1), a second switch (S2), a first MOS transistor (M1), a second MOS transistor (M2), a capacitor (C1), a resistor (R1) and a comparator (A1), wherein a first end of the first switch (S1) is connected to a first input end, and a second end of the first switch (S1) is connected to a drain electrode of the first MOS transistor (M1) and a gate electrode of the second MOS transistor (M2); a first end of the second switch (S2) is connected to a second input end, and a second end of the second switch (S2) is connected to a drain electrode of the second MOS transistor (M2) and a gate electrode of the first MOS transistor (M1); the source electrode of the first MOS tube (M1) is connected with the source electrode of the second MOS tube (M2), and is connected with the input end of the comparator (A1); one end of the capacitor (C1) is connected with the source electrode of the first MOS transistor (M1) and the source electrode 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 with the source electrode of the first MOS transistor (M1) and the source electrode of the second MOS transistor (M2) and is connected to the input end of the comparator, and the other end of the resistor (R1) is grounded.
2. The automatic gain management based wireless transceiver of claim 1, wherein the receiving module (30) comprises:
the low-noise amplifier is used for amplifying the radio-frequency signal to obtain a first amplified signal;
the first mixing circuit is used for carrying out frequency shift on the first amplified signal and the first phase signal to obtain a first mixing signal;
the first low-pass filter is used for filtering the first mixing signal to obtain a first filtering signal;
the first variable gain amplifier is used for amplifying the first filtering signal to obtain a second amplifying signal;
the second low-pass filter is used for filtering 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;
the second mixing circuit is used for carrying out frequency shifting on the amplified signal and the second phase signal to obtain a second mixing signal;
the third low-pass filter is used for filtering the second mixing signal to obtain a third filtering signal;
the second variable gain amplifier is used for amplifying the third filtered signal to obtain a third amplified signal;
the fourth low-pass filter is used for filtering the second amplified signal to obtain a fourth filtered signal;
and the second analog-to-digital converter is used for converting the fourth filtered signal into a fifth digital signal.
3. The automatic gain management based wireless transceiver of claim 2, wherein the first saturation detection module (40) comprises:
the first saturation detection circuit (401) is configured to filter the first mixing signal and compare the filtered signal with a first preset parameter to obtain a first comparison result;
and the second saturation detection circuit (402) is used for filtering the second filtered signal and comparing the filtered signal with a second preset parameter to obtain a second comparison result.
4. The automatic gain management based wireless transceiver of claim 2, wherein the first gain management module (80) is configured to adjust the gains of the low noise amplifier, the first mixer circuit and the first variable gain amplifier in sequence according to the first detection result and the first processing result.
5. The automatic gain management based wireless transceiver of claim 1, wherein the transmitting module (60) comprises:
a second digital-to-analog converter for converting the second digital signal to an analog signal;
the fifth low-pass filter is used for filtering the analog signal to obtain a fifth filtered signal;
the automatic gain control amplifier is used for amplifying the fifth filtering signal to obtain a fourth amplifying signal;
the third mixer is used for carrying out frequency shifting on the fourth amplified signal and the local oscillation signal to obtain a third mixing signal;
a sixth low-pass filter, configured to filter the third mixing signal to obtain a sixth filtered signal;
and the power amplifier is used for amplifying the sixth filtered signal to obtain the radio-frequency signal for transmission.
6. The automatic gain management based wireless transceiver of claim 5, wherein the second saturation detection module (70) comprises:
a third saturation detection circuit (701) for filtering the fourth amplified signal and comparing the filtered signal with a third preset parameter to obtain a third comparison result;
a fourth saturation detection circuit (702) configured to filter the sixth filtered signal and compare the filtered signal with a fourth preset parameter to obtain a fourth comparison result;
and the fifth saturation detection circuit (703) is used for filtering the radio-frequency signal for transmission and comparing the filtered signal with a fifth preset parameter to obtain a fifth comparison result.
7. The automatic gain management based wireless transceiver of claim 5, wherein the second gain management module (90) is configured to sequentially adjust the gains of the automatic gain control amplifier, the third mixer and the power amplifier according to the second detection result and the second processing result.
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| CN112436851B (en) * | 2020-07-21 | 2022-04-01 | 珠海市杰理科技股份有限公司 | Detection circuit and detection method, wireless radio frequency receiver, chip and electrical equipment |
| CN115395973B (en) * | 2021-05-07 | 2023-07-14 | 珠海市杰理科技股份有限公司 | Receiver automatic gain control method, circuit, radio frequency chip and wireless terminal |
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