CN116032231A - Automatic gain control circuit and radio frequency receiving circuit applied to IR-UWB communication - Google Patents
Automatic gain control circuit and radio frequency receiving circuit applied to IR-UWB communication Download PDFInfo
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- CN116032231A CN116032231A CN202211619642.0A CN202211619642A CN116032231A CN 116032231 A CN116032231 A CN 116032231A CN 202211619642 A CN202211619642 A CN 202211619642A CN 116032231 A CN116032231 A CN 116032231A
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Abstract
The invention relates to an automatic gain control circuit and a radio frequency receiving circuit applied to IR-UWB communication, comprising: the adjustable gain amplifier is used for receiving signals to be processed, and comprises a first control unit, a second control unit, an AD sampling unit, a sampling threshold setting unit, a signal averaging unit, a first comparison unit, a first loop filter, a second comparison unit and a second loop filter; the adjustable gain amplifier is connected with the second control unit; the AD sampling unit is connected with the adjustable gain amplifier and the sampling threshold setting unit; the signal average unit is connected with the AD sampling unit; the first comparison unit is connected with the signal averaging unit and the first loop filter; the first control unit is connected with the first loop filter and the sampling threshold setting unit; the second comparison unit is connected with the first loop filter and the second loop filter; the second control unit is connected with the second loop filter. The implementation of the invention can reduce the circuit area and the power consumption while ensuring the performance of the AGC circuit.
Description
Technical Field
The present invention relates to the field of radio frequency technology, and more particularly, to an automatic gain control circuit and a radio frequency receiving circuit applied to IR-UWB communication.
Background
In wireless communication, the signal power received by a receiver fluctuates due to multipath effects, distance, and the like, and in order to solve this problem, an automatic gain control circuit (AGC) needs to be added in the wireless communication system. The AGC circuit is actually a negative feedback system, the feedback action representing that the effect of the output voltage on the input is a negative action. The AGC circuit has very wide practical application, and can ensure that the amplitude of the output voltage of the receiver is basically unchanged on the premise of ensuring certain accuracy; it is not only insensitive to the change of system parameters, but also has proper response speed. The AGC circuit of a typical communication receiver includes PGA, ADC, digital adjusting circuit. In operation, the digital adjusting circuit correspondingly adjusts the gain of the PGA according to the magnitude of the input value of the ADC.
IR-UWB uses a narrow pulse signal form, with a corresponding ADC having a higher sampling rate. Many current AGC circuits use high precision ADCs to determine signal strength, which increases chip area and power consumption, and how to improve accuracy of the AGC control process is a difficulty in AGC design in order to reduce the area and power consumption of the receiver chip design.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic gain control circuit and a radio frequency receiving circuit applied to IR-UWB communication.
The technical scheme adopted for solving the technical problems is as follows: an automatic gain control circuit for IR-UWB communication, comprising: the device comprises an adjustable gain amplifier for receiving a signal to be processed, a first control unit, a second control unit, an AD sampling unit, a sampling threshold setting unit, a signal averaging unit, a first comparison unit, a first loop filter, a second comparison unit and a second loop filter;
the adjustable gain amplifier is connected with the second control unit and is used for receiving a second control signal of the second control unit to adjust an output signal corresponding to the signal to be processed;
the AD sampling unit is connected with the adjustable gain amplifier and the sampling threshold setting unit and is used for generating a sampling signal corresponding to the output signal according to the sampling threshold generated by the sampling threshold setting unit;
the signal averaging unit is connected with the AD sampling unit and is used for averaging the sampling signals according to a preset period to obtain a sampling signal average value;
the first comparison unit is connected with the signal average unit and the first loop filter and is used for obtaining a first initial error between the average value of the sampling signal and a first reference value, wherein the first loop filter is used for obtaining a first output value based on the first initial error;
the first control unit is connected with the first loop filter and the sampling threshold setting unit and is used for generating a first control signal according to the first output value so as to control the sampling threshold setting unit to generate the sampling threshold;
the second comparison unit is connected with the first loop filter and the second loop filter and is used for acquiring a second initial error between the first output value and a second reference value, wherein the second loop filter is used for acquiring a second output value based on the second initial error;
the second control unit is connected with the second loop filter and is used for generating the second control signal according to the second output value.
Preferably, in the automatic gain control circuit according to the present invention,
the sampling threshold comprises a first threshold and a second threshold, and the sampling signal comprises a first sampling signal larger than the first threshold and a second sampling signal smaller than the second threshold;
the signal averaging unit is configured to accumulate and average the first sampled signal according to the preset period to obtain a first sampled signal average value, accumulate and average the second sampled signal to obtain a second sampled signal average value, and obtain an average value of absolute values of the first sampled signal average value and the second sampled signal average value as the sampled signal average value.
Preferably, in the automatic gain control circuit according to the present invention, the first threshold is a positive value, and the second threshold is a negative value.
Preferably, in the automatic gain control circuit according to the present invention, the sampling threshold setting unit is configured to generate the first threshold and the second threshold according to the first control signal, respectively, where an absolute value of the first threshold is the same as an absolute value of the second threshold.
Preferably, in the automatic gain control circuit according to the present invention, the preset period is a signal period of the signal to be processed.
Preferably, in the automatic gain control circuit according to the present invention, the first loop filter is a proportional-integral filter and/or the second loop filter is a proportional-integral filter.
Preferably, in the automatic gain control circuit according to the present invention, the adjustable gain amplifier is a programmable gain amplifier.
Preferably, in the automatic gain control circuit according to the present invention, the first reference value is adjusted according to an input signal amplitude range of the adjustable gain amplifier.
Preferably, in the automatic gain control circuit according to the present invention, the second reference value is adjusted according to an input signal amplitude range of the adjustable gain amplifier.
In addition, the present invention also constructs a radio frequency receiving circuit for IR-UWB communication, comprising: the device comprises a front-end radio frequency receiving unit, a frequency mixing unit connected with the front-end radio frequency receiving unit, a first gain control circuit connected with an I-path output of the frequency mixing unit, and a second gain control circuit connected with a Q-path output of the frequency mixing unit; wherein the first gain control circuit and the second gain control circuit are each the automatic gain control circuit described above.
The automatic gain control circuit and the radio frequency receiving circuit applied to IR-UWB communication have the following beneficial effects: the circuit area and power consumption can be reduced while ensuring the performance of the AGC circuit.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic diagram showing the configuration of an automatic gain control circuit applied to IR-UWB communication according to an embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of an automatic gain control circuit applied to IR-UWB communication of the present invention, it comprises: an adjustable gain amplifier 110 for receiving a signal to be processed, and a first control unit 161, a second control unit 162, an AD sampling unit 120, a sampling threshold setting unit 170, a signal averaging unit 130, a first comparing unit 141, a first loop filter 151, a second comparing unit 142, a second loop filter 152; the adjustable gain amplifier 110 is connected to the second control unit 162, and is configured to receive a second control signal of the second control unit 162 to adjust an output signal corresponding to the signal to be processed; the AD sampling unit 120 is connected to the adjustable gain amplifier 110 and the sampling threshold setting unit 170, and is configured to generate a sampling signal corresponding to the output signal according to a sampling threshold generated by the sampling threshold setting unit 170; the signal averaging unit 130 is connected to the AD sampling unit 120, and is configured to average the sampled signal according to a preset period to obtain a sampled signal average value; the first comparing unit 141 is connected to the signal averaging unit 130 and the first loop filter 151, and is configured to obtain a first initial error between the average value of the sampled signal and a first reference value, where the first loop filter 151 is configured to obtain a first output value according to the first initial error; the first control unit 161 is connected to the first loop filter 151 and the sampling threshold setting unit 170, and is configured to generate a first control signal according to the first output value to control the sampling threshold setting unit 170 to generate the sampling threshold; the second comparing unit 142 is connected to the first loop filter 151 and the second loop filter 152, and is configured to obtain a second initial error between the first output value and a second reference value, where the second loop filter 152 is configured to obtain a second output value according to the second initial error; the second control unit 162 is connected to the second loop filter 152, and is configured to generate the second control signal according to the second output value.
Specifically, the gain-adjustable amplifier 110 performs gain adjustment according to the received second control signal of the second control unit 162 to finally adjust the amplification process of the signal to be processed, so as to obtain a corresponding output signal. The AD sampling unit 120 is connected to the adjustable gain amplifier 110 and the sampling threshold setting unit 170, and is configured to control a sampling process of the output signal of the adjustable gain amplifier 110 according to the sampling threshold generated by the sampling threshold setting unit 170 to obtain a corresponding sampling signal, the signal averaging unit 130 averages the sampling signal according to a preset rule to obtain a sampling signal average value, the first comparing unit 141 compares the sampling signal average value with a first reference value to obtain a first initial error of the sampling signal average value relative to the first reference value, and the first initial error is preprocessed by the first loop filter 151 to obtain a first output value. The first control unit 161 adjusts the first control signal according to the obtained first output value to control the sampling threshold setting unit 170 to generate a corresponding sampling threshold, that is, the first control unit 161 forms a feedback loop to control the operation of the AD sampling unit 120, so that the sampling result of the AD sampling unit 120 can be more accurately close to the input signal. The AD sampling unit inputs the obtained sampling signal to a receiving signal baseband processing circuit to finally obtain a demodulation processing process of the receiving signal. The first comparison unit 141 and the first loop filter 151 may enable the control of the sampling threshold of the AD sampling unit 120 within an acceptable signal range for the operation of the AD sampling unit 120.
In an embodiment, the first reference value is adjusted according to an input signal amplitude range of the adjustable gain amplifier. I.e. the first reference value may be adjusted by the user in dependence of the input signal amplitude range of the adjustable gain amplifier. The purpose is to ensure that the sampling threshold of the AD sampling unit 120 can be within the normal operating range of the AD sampling unit 120 as much as possible.
The second comparing unit 142 is configured to compare the first output value with a second reference value to obtain a comparison result of the first output value with respect to the second reference value, that is, obtain a second initial error of the first output value with respect to the second reference value, and perform preprocessing on the second initial error through the second loop filter 152 to obtain a second output value, and the second control unit 162 generates a corresponding second control signal according to the second output value. Finally, the gain control of the adjustable gain controller is realized, and the automatic gain control process of the receiving link of the signal to be processed is realized. By means of the second comparing unit 142 and the second loop filter 152, when the output value of the adjustable gain amplifier 110 exceeds the acceptable signal range of the AD sampling unit 120, the output signal of the adjustable gain amplifier 110 can be restored to the controllable range of the AD sampling unit 120 by controlling the gain of the adjustable gain amplifier 110.
In an embodiment, the second reference value is adjusted according to an input signal amplitude range of the adjustable gain amplifier. I.e. the second reference value may be adjusted by the user in dependence of the input signal amplitude range of the adjustable gain amplifier. The purpose is to ensure that the input of the AD sampling unit 120 is as good as possible within the acceptable range of the AD sampling unit 120.
Optionally, the sampling threshold includes a first threshold and a second threshold, and the sampling signal includes a first sampling signal greater than the first threshold and a second sampling signal less than the second threshold; the signal averaging unit 130 is configured to accumulate and average the first sampled signal according to the preset period to obtain a first sampled signal average value, accumulate and average the second sampled signal to obtain a second sampled signal average value, and obtain an average value of absolute values of the first sampled signal average value and the second sampled signal average value as the sampled signal average value. Specifically, during the operation of the AD sampling unit 120, a reasonable sampling threshold may be set to obtain a sampling signal of the output signal. Wherein, since the input signal can be understood as being approximately sinusoidal, it can set corresponding sampling thresholds according to the peaks and troughs thereof, respectively, i.e. a first sampling signal larger than the first threshold is obtained through the first threshold, and a second sampling signal smaller than the second threshold is obtained according to the second threshold. The process of obtaining the average value of the sampled signals by the signal averaging unit 130 may be understood as respectively performing cumulative average on the first sampled signals in the preset period to obtain a first average value of the sampled signals, performing cumulative average on the second sampled signals in the preset period to obtain a second average value of the sampled signals, obtaining an average value of absolute values of the average values of the two sampled signals, and finally obtaining the average value of the sampled signals.
Optionally, the first threshold is a positive value, and the second threshold is a negative value, that is, it can be understood that the signal to be processed is a normalized ac signal from which dc is removed, and at this time, the first threshold may be set to be a positive value, the positive waveform of the ac signal is sampled, the second threshold is set to be a negative value, and the negative waveform of the ac waveform is sampled.
Optionally, the sampling threshold setting unit 170 is configured to generate the first threshold and the second threshold according to the first control signal, where an absolute value of the first threshold is the same as an absolute value of the second threshold. The process of generating the first threshold and the second threshold by the sampling threshold value setting unit generates an absolute value, directly sets the absolute value as the first threshold according to the absolute value, adds a negative value to the absolute value to obtain a negative value, and sets the negative value as the second threshold.
Optionally, the preset period is a signal period of the signal to be processed. Alternatively, the adjustment process for the adjustable gain amplifier 110 may be a periodic adjustment, with each adjustment period being set primarily according to the periodicity of the input signal to be processed. For example, the input to-be-processed signal is an ieee802.15.4z UWB signal, and each symbol has a period of about 1us, and may have a corresponding adjustment period of 1us. The sampling threshold control of the AD sampling unit 120 and the amplification gain control of the adjustable gain amplifier 110 are performed separately at each adjustment period.
Optionally, the first loop filter 151 is a proportional-integral filter. In particular, the loop filter functions to include a proportional and integral element to reduce the effect of noise through the integral element. The pi filter may be kp_dac_error 1+sum (ki_dac_error 1), where error1 is the first initial error. Where kp_dac is a coefficient of the proportional link, and ki_dac is a coefficient of the integral link, which may be set with corresponding constants according to the operating parameters of the AD sampling unit 120, respectively.
Optionally, the second loop filter 152 is a proportional-integral filter. Specifically, the structure of the proportional-integral filter may be kp_pga×error2+sum (ki_pga×error 2). The second control unit 162 is configured to generate a second control signal according to the output of the loop filter, so as to finally achieve the purpose of setting the amplification amplitude of the baseband signal. Wherein error2 is the second initial error. Where kp_pga is a coefficient of the proportional link and ki_pga is a coefficient of the integral link, which may be set with corresponding constants according to the operating parameters of the adjustable gain amplifier 110, respectively.
Optionally, the adjustable gain amplifier 110 is a programmable gain amplifier. That is, the second control unit 162 is used to set the control word of the programmable gain amplifier, and at the same time, its control process needs to be ensured within the adjustment range of the programmable gain amplifier. I.e. the process of generating the second control signal, requires a compromise between the full range of the programmable gain amplifier and the adjustment step.
Similarly, it is understood that the process of generating the first control signal by the first control unit 161 also needs to consider the full scale range of the AD sampling unit 120 and the adjustment steps thereof to obtain the most reasonable first control signal. Since the AD sampling unit 120 can sample the input signal of the ADC module in the link, the input signal of the ADC module can be ensured to be within a reasonable range based on the process. Thus, when the control process of the first control unit 161 exceeds the signal range acceptable to the ADC, the gain of the adjustable gain amplifier can be controlled by the second control unit 162 so that the signal entering the ADC is restored to the ADC controllable range. In addition, the AD sampling unit 120 may be integrated with the ADC module.
In addition, a radio frequency receiving circuit for IR-UWB communication according to the present invention includes: the device comprises a front-end radio frequency receiving unit, a frequency mixing unit connected with the front-end radio frequency receiving unit, a first gain control circuit connected with an I-path output of the frequency mixing unit, and a second gain control circuit connected with a Q-path output of the frequency mixing unit; wherein the first gain control circuit and the second gain control circuit are each the automatic gain control circuit described above.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. An automatic gain control circuit for IR-UWB communications, comprising: the device comprises an adjustable gain amplifier for receiving a signal to be processed, a first control unit, a second control unit, an AD sampling unit, a sampling threshold setting unit, a signal averaging unit, a first comparison unit, a first loop filter, a second comparison unit and a second loop filter;
the adjustable gain amplifier is connected with the second control unit and is used for receiving a second control signal of the second control unit to adjust an output signal corresponding to the signal to be processed;
the AD sampling unit is connected with the adjustable gain amplifier and the sampling threshold setting unit and is used for generating a sampling signal corresponding to the output signal according to the sampling threshold generated by the sampling threshold setting unit;
the signal averaging unit is connected with the AD sampling unit and is used for averaging the sampling signals according to a preset period to obtain a sampling signal average value;
the first comparison unit is connected with the signal average unit and the first loop filter and is used for obtaining a first initial error between the average value of the sampling signal and a first reference value, wherein the first loop filter is used for obtaining a first output value based on the first initial error;
the first control unit is connected with the first loop filter and the sampling threshold setting unit and is used for generating a first control signal according to the first output value so as to control the sampling threshold setting unit to generate the sampling threshold;
the second comparison unit is connected with the first loop filter and the second loop filter and is used for acquiring a second initial error between the first output value and a second reference value, wherein the second loop filter is used for acquiring a second output value based on the second initial error;
the second control unit is connected with the second loop filter and is used for generating the second control signal according to the second output value.
2. The automatic gain control circuit of claim 1 wherein,
the sampling threshold comprises a first threshold and a second threshold, and the sampling signal comprises a first sampling signal larger than the first threshold and a second sampling signal smaller than the second threshold;
the signal averaging unit is configured to accumulate and average the first sampled signal according to the preset period to obtain a first sampled signal average value, accumulate and average the second sampled signal to obtain a second sampled signal average value, and obtain an average value of absolute values of the first sampled signal average value and the second sampled signal average value as the sampled signal average value.
3. The automatic gain control of claim 2 wherein the first threshold is positive and the second threshold is negative.
4. The automatic gain control circuit of claim 3 wherein,
the sampling threshold setting unit is configured to generate the first threshold and the second threshold according to the first control signal, where an absolute value of the first threshold is the same as an absolute value of the second threshold.
5. The automatic gain control circuit of claim 1 wherein the predetermined period is a signal period of the signal to be processed.
6. The automatic gain control circuit of claim 1 wherein the first loop filter is a proportional-integral filter and/or the second loop filter is a proportional-integral filter.
7. The automatic gain control circuit of claim 1 wherein the adjustable gain amplifier is a programmable gain amplifier.
8. The automatic gain control of claim 1 wherein the first reference value is adjusted based on an input signal amplitude range of the adjustable gain amplifier.
9. The automatic gain control of claim 1 wherein the second reference value is adjusted based on an input signal amplitude range of the adjustable gain amplifier.
10. A radio frequency receiving circuit for IR-UWB communications, comprising: the device comprises a front-end radio frequency receiving unit, a frequency mixing unit connected with the front-end radio frequency receiving unit, a first gain control circuit connected with an I-path output of the frequency mixing unit, and a second gain control circuit connected with a Q-path output of the frequency mixing unit; wherein the first gain control circuit and the second gain control circuit are the automatic gain control circuits of any one of claims 1 to 9, respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211619642.0A CN116032231A (en) | 2022-12-15 | 2022-12-15 | Automatic gain control circuit and radio frequency receiving circuit applied to IR-UWB communication |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211619642.0A CN116032231A (en) | 2022-12-15 | 2022-12-15 | Automatic gain control circuit and radio frequency receiving circuit applied to IR-UWB communication |
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| CN116032231A true CN116032231A (en) | 2023-04-28 |
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| CN202211619642.0A Pending CN116032231A (en) | 2022-12-15 | 2022-12-15 | Automatic gain control circuit and radio frequency receiving circuit applied to IR-UWB communication |
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- 2022-12-15 CN CN202211619642.0A patent/CN116032231A/en active Pending
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