CN216599593U - High-precision digital automatic gain control device and radio frequency receiver - Google Patents
High-precision digital automatic gain control device and radio frequency receiver Download PDFInfo
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- CN216599593U CN216599593U CN202122090244.1U CN202122090244U CN216599593U CN 216599593 U CN216599593 U CN 216599593U CN 202122090244 U CN202122090244 U CN 202122090244U CN 216599593 U CN216599593 U CN 216599593U
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Abstract
The utility model provides a high-precision digital automatic gain control device and a radio frequency receiver, wherein a gain control unit of the gain control device is respectively connected with a gain module and an analog-to-digital converter; the signal processing module converts the frequency of a radio frequency signal to an intermediate frequency and then sends the intermediate frequency signal to the gain module, and the analog-to-digital converter performs analog-to-digital conversion on the signal subjected to gain processing by the gain module; the power accumulation module of the gain control unit is connected with the analog-to-digital converter, the instantaneous power of the digital signal is accumulated to generate a total power value, the automatic gain control circuit is respectively connected with the power accumulation module and the gain module, and a gain adjusting signal is output to the gain module according to the comparison result of the total power value and the target power value. The utility model can convert the accurate power calculation into the digital domain for processing, greatly reduces the precision requirement on the analog-digital converter, thereby reducing the design difficulty and the calculation accuracy, has simple structure and low power consumption, and realizes the aim of accurately controlling the output power.
Description
Technical Field
The utility model relates to the field of gain control, in particular to a high-precision digital automatic gain control device and a radio frequency receiver.
Background
Due to the influence of environmental factors such as propagation path attenuation, the strength of the signal power received by the radio frequency receiver is greatly changed. In addition, various communication systems coexist in the existing environment, the environment is complex, and the situation that interference signals fall into a signal band of a receiver is difficult to avoid. In order to fully exert the dynamic performance of an analog-to-digital converter in a radio frequency receiver and ensure the signal quality of the receiver, the receiver needs to perform automatic gain control according to the signal power so as to ensure that each stage of circuits of the receiver are in a correct working state.
Two automatic gain control modes of the existing radio frequency receiver exist, one mode is realized by adopting an analog detection digital feedback mode, and the mechanism is sensitive to process, temperature and voltage changes, so that the output power difference between chips is large; another way is to use digital power detection digital feedback. The digital signal output by the analog-to-digital converter of the signal link is subjected to power calculation and is compared with a target value, and a dichotomy digital algorithm is adopted to output a digital control code to adjust the analog intermediate frequency PGA gain, so that the aim of stabilizing power output is fulfilled. Because the method obtains the real-time value by performing modulus on the output value of the analog-digital converter, the obtained gain control precision is seriously dependent on the precision of the analog-digital converter. In some receiver architectures using low-precision analog-to-digital converters, the automatic gain control scheme results in large variations in the analog intermediate frequency output power, and thus each stage of circuit of the receiver cannot be in a correct working state.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a high-precision digital automatic gain control device and a radio frequency receiver, wherein a signal processing module is used for processing a radio frequency signal to generate an intermediate frequency signal, the intermediate frequency signal is transmitted to an analog-to-digital converter after being subjected to gain processing by the gain module, the digital signal output by the analog-to-digital converter is subjected to processing and instantaneous power is calculated, a gain adjusting signal is output according to a comparison result of a total power value formed by accumulating the instantaneous power and a target power value, the accurate calculation of the power can be converted into a digital domain for processing, the precision requirement on the analog-to-digital converter is greatly reduced, the design difficulty and the calculation accuracy are reduced, the structure is simple, the power consumption is low, and the purpose of accurately controlling the output power is realized.
In order to solve the above problems, the present invention adopts a technical solution as follows: a high precision digital automatic gain control device, the high precision digital automatic gain control device comprising: the gain control unit is respectively connected with the gain module and the analog-to-digital converter; the signal processing module receives a radio frequency signal, converts the radio frequency signal into an intermediate frequency and then sends the intermediate frequency to the gain module, and the analog-to-digital converter converts a signal subjected to gain processing by the gain module into a digital signal and sends the digital signal to the gain control unit; the gain control unit comprises a power accumulation module and an automatic gain control circuit, wherein the power accumulation module is connected with the analog-to-digital converter and used for accumulating the instantaneous power of the digital signal to generate a total power value, and the automatic gain control circuit is respectively connected with the power accumulation module and the gain module and used for acquiring a comparison result of the total power value and a target power value and outputting a gain adjusting signal to the gain module according to the comparison result.
Furthermore, the signal processing module comprises a low noise amplifier and a mixer, and the mixer is respectively connected with the low noise amplifier and the gain module.
Furthermore, the signal processing module further comprises a filter, the filter is respectively connected with the mixer and the gain module, and the mixer sends the radio frequency signal to the gain module through the filter.
Furthermore, the gain module comprises a large step gain amplifier and a small step gain amplifier, the signal processing module is connected with the large step gain amplifier, and the small step gain amplifier is respectively connected with the large step gain amplifier and the analog-to-digital converter.
Further, the large step gain amplifier includes a first large step gain amplifier and a second large step gain amplifier, the small step gain amplifier includes a first small step gain amplifier and a second small step gain amplifier, the first large step gain amplifier is respectively connected with the second large step gain amplifier and the first small step gain amplifier, and the second small step gain amplifier is respectively connected with the first small step gain amplifier and the second large step gain amplifier.
Further, the analog-to-digital converter comprises a first analog-to-digital converter and a second analog-to-digital converter, the first analog-to-digital converter is respectively connected with the first small step gain amplifier and the power accumulation module, and the second analog-to-digital converter is respectively connected with the second small step gain amplifier and the power accumulation module.
Furthermore, the power accumulation module includes a modulus acquisition circuit and a power accumulation circuit, the modulus acquisition circuit acquires the instantaneous power of the analog-to-digital converter, the instantaneous power is output to the power accumulation circuit, and the power accumulation circuit accumulates the instantaneous power to obtain a total power value.
Furthermore, the power accumulation module further comprises a digital filter circuit, and the power accumulation module performs digital smoothing processing on the signal generated by instantaneous power accumulation through the digital filter circuit to obtain a total power value.
Based on the same inventive concept, the utility model also provides a radio frequency receiver, which comprises a radio frequency signal receiving circuit and the high-precision digital automatic gain control device, wherein the radio frequency signal receiving circuit is connected with the high-precision digital automatic gain control device.
Compared with the prior art, the utility model has the beneficial effects that: the signal processing module is used for processing a radio frequency signal to generate an intermediate frequency signal, the intermediate frequency signal is transmitted to the analog-to-digital converter after being subjected to gain processing by the gain module, the instantaneous power is calculated by taking a digital signal output by the analog-to-digital converter, a gain adjusting signal is output according to a comparison result of a total power value and a target power value formed by accumulating the instantaneous power, accurate calculation of the power can be converted into a digital domain for processing, the precision requirement on the analog-to-digital converter is greatly reduced, the design difficulty and the calculation accuracy are reduced, the structure is simple, the power consumption is low, and the purpose of accurately controlling the output power is achieved.
Drawings
FIG. 1 is a block diagram of an embodiment of a high precision digital automatic gain control apparatus according to the present invention;
FIG. 2 is a block diagram of another embodiment of a high precision digital automatic gain control apparatus according to the present invention;
FIG. 3 is a flow chart of an embodiment of a gain control process of the high precision digital automatic gain control apparatus according to the present invention;
fig. 4 is a block diagram of an embodiment of the rf receiver of the present invention.
In the figure: 1. a signal processing module; 2. a gain module; 3. an analog-to-digital converter; 4. a gain control unit; 11. a low noise amplifier; 12. a mixer; 211. a first large step gain amplifier; 212. a second large step gain amplifier; 221. a first small step gain amplifier; 222. a second small step gain amplifier; 31. a first analog-to-digital converter; 32. a second analog-to-digital converter; 41. a modulus taking circuit; 42. a power accumulation circuit; 43. a digital filter circuit; 44. an automatic gain control circuit.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Referring to fig. 1-3, fig. 1 is a structural diagram of an embodiment of a high-precision digital automatic gain control device according to the present invention; FIG. 2 is a block diagram of another embodiment of a high precision digital automatic gain control apparatus according to the present invention;
fig. 3 is a flow chart of an embodiment of a gain control process of the high-precision digital automatic gain control device according to the present invention, and the high-precision digital automatic gain control device according to the present invention will be described in detail with reference to fig. 1-3.
In the present embodiment, the high-precision digital automatic gain control device includes: the gain control device comprises a signal processing module 1, a gain module 2, an analog-to-digital converter 3 and a gain control unit 4, wherein the gain control unit 4 is respectively connected with the gain module 2 and the analog-to-digital converter 3; the signal processing module 1 receives a radio frequency signal, converts the radio frequency signal into an intermediate frequency and sends the intermediate frequency to the gain module 2, and the analog-to-digital converter 3 converts a signal subjected to gain processing by the gain module 2 into a digital signal and sends the digital signal to the gain control unit 4; the gain control unit 4 includes a power accumulation module connected to the analog-to-digital converter 3 for accumulating the instantaneous power of the digital signal to generate a total power value, and an automatic gain control circuit 44 connected to the power accumulation module and the gain module 2 respectively for obtaining a comparison result between the total power value and a target power value and outputting a gain adjustment signal to the gain module 2 according to the comparison result.
In this embodiment, the signal processing module 1 includes a low noise amplifier 11 and a mixer 12, and the mixer 12 is connected to the low noise amplifier 11 and the gain module 2, respectively.
The low noise amplifier 11 is configured to amplify a received radio frequency signal, the mixer 12 is a down converter, and the mixer 12 down-converts the amplified radio frequency signal to an intermediate frequency signal of an intermediate frequency.
In this embodiment, the signal processing module 1 further includes a filter, the filter is respectively connected to the mixer 12 and the gain module 2, and the mixer 12 sends the radio frequency signal to the gain module 2 through the filter.
In a specific embodiment, the filter is an intermediate frequency filter.
In this embodiment, the gain module 2 includes a large step gain amplifier and a small step gain amplifier, the signal processing module 1 is connected to the large step gain amplifier, and the small step gain amplifier is respectively connected to the large step gain amplifier and the analog-to-digital converter 3. The gain step of the large stepping gain amplifier is larger than that of the small stepping gain amplifier, and the large stepping gain amplifier and the small stepping gain amplifier have a gear gain control function.
In a preferred embodiment, the gain step of the large step gain amplifier is 16dB and the gain adjustment range is 48 dB. The small stepping gain amplifier realizes fine gain adjustment, the gain stepping of the small stepping gain amplifier is 0.5dB, and the gain adjustment range of 0 dB-15.5 dB can be realized. The gain configuration of the large step gain amplifier and the small step gain amplifier is shown in table one:
table one, gain configuration table
In the present embodiment, the large step gain amplifier includes a first large step gain amplifier 211 and a second large step gain amplifier 212, the small step gain amplifier includes a first small step gain amplifier 221 and a second small step gain amplifier 222, the first large step gain amplifier 211 is connected to the second large step gain amplifier 212 and the first small step gain amplifier 221, respectively, and the second small step gain amplifier 222 is connected to the first small step gain amplifier 221 and the second large step gain amplifier 212, respectively.
The analog-to-digital converter 3 includes a first analog-to-digital converter 31 and a second analog-to-digital converter 32, the first analog-to-digital converter 31 is respectively connected to the first small step gain amplifier 221 and the power accumulation module, and the second analog-to-digital converter 32 is respectively connected to the second small step gain amplifier 222 and the power accumulation module.
In the present embodiment, the analog-to-digital converter 3 is a low-precision analog-to-digital converter 3, but in other embodiments, the analog-to-digital converter 3 may also be a high-precision analog-to-digital converter.
The power accumulation module comprises a modulus taking circuit 41 and a power accumulation circuit 42, wherein the modulus taking circuit 41 obtains the instantaneous power of the analog-to-digital converter 3, the instantaneous power is output to the power accumulation circuit 42, and the power accumulation circuit 42 accumulates the instantaneous power to obtain a total power value. The signal including the total power value is output to the automatic gain control circuit 44.
In a specific embodiment, the analog-to-digital converter 3 outputs a digital signal, and the analog-to-digital converter 41 performs an instantaneous power calculation, for example, using the low-precision 4Bits analog-to-digital converter 3, the formula used in the instantaneous power calculation is:
Pout＝|Dout_i＜3:0＞|2+Dout_q＜3:0＞|2
wherein, PoutFor instantaneous power, Dout_i< 3:0 > is the 4-bit digital output of the first analog-to-digital converter 31, Dout_q< 3:0 > is the 4-bit digital output of the second analog-to-digital converter 32.
In this embodiment, the power accumulation module further includes a digital filter circuit 43, and the power accumulation module performs digital smoothing processing on the signal generated by accumulating the instantaneous power through the digital filter circuit 43 to obtain a total power value.
The function of the power accumulation module is used for accumulating the instantaneous power in a plurality of sampling periods, so that the purpose of power envelope tracking is realized. And the digital filter circuit 43 is used to realize the smoothing of the power envelope, so as to obtain more accurate total power output.
In a specific embodiment, the principle formula for the power accumulation circuit 42 to obtain the total power value is as follows:
Pout_tol＝(N*Pout)*(k*H(z))
wherein, Pout_tolFor the total power value after digital filtering, N is a power accumulation length (the numerical value of the digital signal output from the analog-to-digital converter 3 is accumulated for a certain time period, which is the accumulation length), and can be configured by a register, k is a digital filter coefficient, k can be set by the register to perform automatic gain control convergence time length configuration, and h (z) isA digital filter transfer function.
In the present embodiment, the automatic gain control circuit 44 compares the current total power value with the target power value, performs determination according to the comparison result, converts the result into a gain adjustment signal, and outputs the gain adjustment signal to the large step gain amplifier and the small step gain amplifier for gain adjustment.
In this embodiment, the step of outputting the gain adjustment signal to the gain module 2 according to the comparison result includes: judging whether the power is in a preset range according to the comparison result, if so, not outputting a gain adjustment signal; if not, the gain adjusting signal is output according to the size of the total power value relative to the target power value.
The process of performing automatic gain control through the high-precision digital automatic gain control of the device is as follows:
the high-precision automatic gain control device is started, gains are initialized, and digital results converted by the analog-to-digital converter 3 are output to the gain control unit 4; the gain control unit 4 performs automatic gain enabling identification judgment; performing modulus processing on data output by the analog-to-digital converter 3, and calculating instantaneous power; performing instantaneous power accumulation processing, and performing digital smoothing processing to obtain a total power value; comparing and judging the total power value and the target power value, and if the total power is determined to be in a target power range (preset range) according to a comparison result, not performing gain adjustment; if the total power is larger than the target power and the gain is not the minimum gain value at the moment, reducing the gain control (the gain adjustment step can be carried out by checking a truth table); if the total power is less than the target power and the gain is not the maximum gain value at the moment, increasing the gain control; when the gain is adjusted to be maximum or minimum and the final total power value cannot fall into the target power range, jumping out of the automatic gain control loop, and outputting a corresponding maximum or minimum gain value (under the condition that the gain is adjusted to be maximum or minimum after automatic gain control and cannot be adjusted again). And outputting a final gain control word after the target power value is reached, and outputting an automatic gain completion flag AGC _ DONE.
Has the advantages that: the high-precision digital automatic gain control device processes radio frequency signals through the signal processing module to generate intermediate frequency signals, the intermediate frequency signals are transmitted to the analog-digital converter after being subjected to gain processing by the gain module, the digital signals output by the analog-digital converter are subjected to processing to calculate instantaneous power, gain adjusting signals are output according to a comparison result of a total power value formed by accumulation of the instantaneous power and a target power value, accurate calculation of the power can be converted into a digital domain for processing, the precision requirement of the analog-digital converter is greatly reduced, the design difficulty and the calculation accuracy are reduced, the structure is simple, the power consumption is low, and the purpose of accurately controlling the output power is achieved.
Based on the same inventive concept, the present invention further provides a radio frequency receiver, please refer to fig. 4, where fig. 4 is a structural diagram of an embodiment of the radio frequency receiver of the present invention. The radio frequency receiver of the present invention is explained in conjunction with fig. 4.
In the present embodiment, the rf receiver includes an rf signal receiving circuit and a high-precision digital automatic gain control device as in the above embodiments.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A high accuracy digital automatic gain control device, comprising: the gain control unit is respectively connected with the gain module and the analog-to-digital converter;
the signal processing module receives a radio frequency signal, converts the radio frequency signal into an intermediate frequency and then sends the intermediate frequency to the gain module, and the analog-to-digital converter converts a signal subjected to gain processing by the gain module into a digital signal and sends the digital signal to the gain control unit;
the gain control unit comprises a power accumulation module and an automatic gain control circuit, wherein the power accumulation module is connected with the analog-to-digital converter and used for accumulating the instantaneous power of the digital signal to generate a total power value, and the automatic gain control circuit is respectively connected with the power accumulation module and the gain module and used for acquiring a comparison result of the total power value and a target power value and outputting a gain adjusting signal to the gain module according to the comparison result.
2. The high accuracy digital automatic gain control device of claim 1, wherein the signal processing module comprises a low noise amplifier and a mixer, and the mixer is connected to the low noise amplifier and the gain module respectively.
3. The high accuracy digital automatic gain control device of claim 2, wherein the signal processing module further comprises a filter, the filter is connected to the mixer and the gain module, respectively, and the mixer sends the rf signal to the gain module through the filter.
4. The high accuracy digital automatic gain control device of claim 1, wherein the gain module comprises a large step gain amplifier and a small step gain amplifier, the signal processing module is connected to the large step gain amplifier, and the small step gain amplifier is connected to the large step gain amplifier and the analog-to-digital converter respectively.
5. The high accuracy digital automatic gain control device according to claim 4, wherein the large step gain amplifier comprises a first large step gain amplifier and a second large step gain amplifier, and the small step gain amplifier comprises a first small step gain amplifier and a second small step gain amplifier, the first large step gain amplifier is connected to the second large step gain amplifier and the first small step gain amplifier, respectively, and the second small step gain amplifier is connected to the first small step gain amplifier and the second large step gain amplifier, respectively.
6. The apparatus according to claim 5, wherein the analog-to-digital converter comprises a first analog-to-digital converter and a second analog-to-digital converter, the first analog-to-digital converter is connected to the first small step gain amplifier and the power accumulation module, and the second analog-to-digital converter is connected to the second small step gain amplifier and the power accumulation module.
7. The apparatus according to claim 6, wherein the power accumulation module comprises a modulus-taking circuit and a power accumulation circuit, the modulus-taking circuit obtains an instantaneous power of the analog-to-digital converter and outputs the instantaneous power to the power accumulation circuit, and the power accumulation circuit accumulates the instantaneous power to obtain a total power value.
8. The high accuracy digital automatic gain control device of claim 7 wherein said power accumulation module further comprises a digital filter circuit, said power accumulation module digitally smoothing a signal generated by said instantaneous power accumulation by said digital filter circuit to obtain a total power value.
9. A radio frequency receiver, characterized in that the radio frequency receiver comprises a radio frequency signal receiving circuit and a high precision digital automatic gain control device according to any one of claims 1 to 8, the radio frequency signal receiving circuit being connected to the high precision automatic gain control device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276681A (en) * | 2022-07-27 | 2022-11-01 | 东集技术股份有限公司 | RFID reader-writer system, transmission power closed-loop control method and main controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276681A (en) * | 2022-07-27 | 2022-11-01 | 东集技术股份有限公司 | RFID reader-writer system, transmission power closed-loop control method and main controller |
| CN115276681B (en) * | 2022-07-27 | 2023-11-24 | 东集技术股份有限公司 | RFID reader-writer system, transmitting power closed-loop control method and main controller |
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