CN107911093A - Automatic growth control agc circuit, method and apparatus - Google Patents
Automatic growth control agc circuit, method and apparatus Download PDFInfo
- Publication number
- CN107911093A CN107911093A CN201711292966.7A CN201711292966A CN107911093A CN 107911093 A CN107911093 A CN 107911093A CN 201711292966 A CN201711292966 A CN 201711292966A CN 107911093 A CN107911093 A CN 107911093A
- Authority
- CN
- China
- Prior art keywords
- signal
- variable gain
- circuit
- gain amplification
- coupling circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000003321 amplification Effects 0.000 claims abstract description 72
- 238000010168 coupling process Methods 0.000 claims abstract description 72
- 238000005859 coupling reaction Methods 0.000 claims abstract description 72
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 72
- 230000008878 coupling Effects 0.000 claims abstract description 71
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000000052 comparative effect Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3089—Control of digital or coded signals
-
- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
This application discloses a kind of automatic growth control agc circuit, method and apparatus, it is related to electronic technology field, is used for realization automatic growth control.Automatic growth control agc circuit includes：Controller, low-noise amplifier, variable gain amplification coupling circuit, power amplifier, the first analog-digital converter ADC, average power detection circuit, operational amplifier, the 2nd ADC.The embodiment of the present application is applied to reception of wireless signals.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of automatic growth control (Automatic Gain
Control, AGC) circuit.Method and apparatus.
Background technology
When rf signal reception link receives WIFI signal when radiofrequency signal, it is necessary to lead to after it is amplified or is decayed
Cross analog-digital converter (Analog-to-Digital Converter, ADC) progress analog-to-digital conversion and obtain digital signal, it is final right
Digital signal is demodulated.The signal strength of Wireless Fidelity (Wireless Fidelity, WIFI) signal or interference signal is at any time
Change, if the amplification or decay of rf signal reception link use fixed gain, when radiofrequency signal or interference signal
It when signal strength is larger, then may cause ADC saturations, when the signal strength of radiofrequency signal or interference signal is smaller, then may
ADC parsing precision is caused to reduce.
The content of the invention
Embodiments herein provides a kind of automatic growth control agc circuit, method and apparatus, to realize that dynamic adjustment is penetrated
The gain of frequency signal receives link.
To reach above-mentioned purpose, embodiments herein adopts the following technical scheme that：
First aspect, there is provided a kind of automatic growth control agc circuit, including：It is controller, low-noise amplifier, variable
Gain amplification coupling circuit, power amplifier, the first analog-digital converter ADC, average power detection circuit, operational amplifier,
Two ADC；Wherein, the input terminal of the low-noise amplifier is used to receive radiofrequency signal, the output terminal of the low-noise amplifier
Connect the first input end of the variable gain amplification coupling circuit；The straight-through output terminal of the variable gain amplification coupling circuit
Connect the input terminal of the power amplifier；The output terminal of the power amplifier connects the input terminal of the first ADC；It is described
The output terminal of first ADC connects the first input end of the controller；The coupling output of the variable gain amplification coupling circuit
End connects the input terminal of the average power detection circuit；The output terminal of the average power detection circuit connects the computing and puts
The input terminal of big device；The output terminal of the operational amplifier connects the input terminal of the 2nd ADC；The output of 2nd ADC
End connects the second input terminal of the controller；The output terminal of the controller connects the variable gain amplification coupling circuit
Second input terminal；
The low-noise amplifier is used to receive radiofrequency signal and be amplified it；
The variable gain amplification coupling circuit, for the control signal according to the controller to the radiofrequency signal into
Row decay；It is additionally operable to export the coupled signal of the radiofrequency signal, the signal of the coupled signal by the coupled output
Intensity proportional is in the signal strength of the radiofrequency signal；
The power amplifier is used to be amplified the radiofrequency signal；
First ADC is used to obtain the first digital signal after carrying out analog-to-digital conversion to the radiofrequency signal, and is sent to
The controller；
The average power detection circuit is used to be detected the coupled signal to obtain analog voltage signal；
The operational amplifier is used to be amplified the analog voltage signal；
2nd ADC is used to obtain the second numeral letter after carrying out the amplified analog voltage signal analog-to-digital conversion
Number, and it is sent to the controller；
The controller is used to receive second digital signal by the 2nd ADC；And according to the described second numeral
Pad value of the variable gain amplification coupling circuit to the radiofrequency signal described in Signal Regulation.
Second aspect, there is provided a kind of automatic growth control AGC methods, applied to AGC electricity as described in relation to the first aspect
Road, the agc circuit includes variable gain amplification coupling circuit, the described method includes：
Receive the second digital signal；
Decay of the variable gain amplification coupling circuit to the radiofrequency signal is adjusted according to second digital signal
Value.
The third aspect, there is provided a kind of controller, applied to agc circuit as described in relation to the first aspect, the agc circuit bag
Variable gain amplification coupling circuit is included, the controller includes：
Receiving unit, for receiving the second digital signal；
Adjustment unit, for being adjusted according to second digital signal to the variable gain amplification coupling circuit to described
The pad value of radiofrequency signal.
Fourth aspect, there is provided a kind of computer-readable recording medium for storing one or more programs, it is one or
Multiple programs include instruction, and described instruction makes the computer perform the method described in second aspect when executed by a computer.
The automatic growth control agc circuit of embodiments herein offer, method and apparatus, couple radiofrequency signal
Coupled signal is obtained, the signal strength of coupled signal is proportional to the signal strength of radiofrequency signal, and coupled signal is detected to obtain mould
Intend voltage signal, analog-to-digital conversion is carried out after being amplified to analog voltage signal and obtains digital signal, is adjusted according to digital signal
The dough softening of VGA on main circuit, i.e., adjust the gain of main circuit according to the signal strength of radiofrequency signal, realizes that dynamic adjustment is penetrated
The gain of frequency signal receives link.
Brief description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described.
Fig. 1 is the schematic diagram one for the agc circuit that embodiments herein provides；
Fig. 2 is the schematic diagram two for the agc circuit that embodiments herein provides；
Fig. 3 is the waveform diagram of the WIFI signal that embodiments herein provides and average power detection；
Fig. 4 is the waveform diagram decayed without VGA and decay by VGA that embodiments herein provides；
Fig. 5 is the time diagram one of interference signal and useful radiofrequency signal that embodiments herein provides；
Fig. 6 is the time diagram two of interference signal and useful radiofrequency signal that embodiments herein provides；
Fig. 7 is the schematic diagram of the time delay for the average power detection circuit that embodiments herein provides；
Fig. 8 is the flow diagram one for the AGC methods that embodiments herein provides；
Fig. 9 is the flow diagram two for the AGC methods that embodiments herein provides；
Figure 10 is the flow diagram three for the AGC methods that embodiments herein provides；
Figure 11 is the structure diagram for the controller that embodiments herein provides.
Embodiment
Below in conjunction with the accompanying drawings, embodiments herein is described.
Gain described in the embodiment of the present application refers to amplification factor, is usually the output signal of a system on electronics
The parameter of directional antenna radiation intensity is represented with the ratio of input signal, such as antenna gain, for directional aerial and not properly
The ratio between electric field strength square produced to antenna in predetermined direction, amplifier gain represent booster output amplification factor, with defeated
Go out power with common logarithm expression of input power ratio etc..
Automatic growth control (Automatic Gain Control, AGC) described in the embodiment of the present application is to instigate amplification
The autocontrol method adjusted Gain Automaticly with signal strength of circuit.AGC is one kind of amplitude limit output, it is using linearly
The efficient combination of amplification and compression amplification is adjusted output signal.When weak signal inputs, linear amplifier circuit work, is protected
The intensity of card output signal；When input signal reaches some strength, start compression amplifying circuit, reduce output amplitude.Its
The amplitude of gain can be automatically controlled by varying input and output compression factor.Therefore, the AGC of single-stage can only will limit signal
Maximum output swing, when input signal is small to a certain extent, output amplitude will reduce.To make output amplitude stabilization at one
Fixed value, may use limited range enlargement AGC and act on could realize at the same time：That is in the case where no AGC is acted on, i.e.,
The amplitude in the case where input signal is most weak, exporting signal is also exceeded required fixed value, then controlled by AGC,
Output amplitude is adjusted to required fixed value, i.e., input signal is generally subjected to multistage amplification, the letter of afterbody amplifier
Number rectified filtered DC level controls the output of first order amplifier.
The embodiment of the present application provides a kind of agc circuit, and with reference to shown in Fig. 1, which includes：Controller 100,
Low-noise amplifier 101, variable gain amplification coupling circuit 102, power amplifier 103, the first analog-digital converter (Analog-
To-Digital Converter, ADC) 104, average power detection circuit 105, operational amplifier 106, the 2nd ADC 107, ratio
Compared with device 108.
Wherein, the input terminal of low-noise amplifier 101 is used to receive radiofrequency signal, the output terminal of low-noise amplifier 101
Connect the first input end of variable gain amplification coupling circuit 102；The straight-through output terminal of variable gain amplification coupling circuit 102 connects
Connect the input terminal of power amplifier 103；The output terminal of power amplifier 103 connects the input terminal of the first ADC 104；First ADC
The first input end of 104 output terminal connection controller；The coupled output connection average of variable gain amplification coupling circuit 102
The input terminal of power-sensing circuit 105；The input terminal of the output terminal concatenation operation amplifier 106 of average power detection circuit 105；
The output terminal of operational amplifier 106 connects the input terminal of the 2nd ADC 107；The output terminal connection controller of 2nd ADC 107
Second input terminal；Second input terminal of the output terminal connection variable gain amplification coupling circuit 102 of controller；Average power detects
The output terminal of circuit 105 is also connected with the input terminal of comparator 108, and comparator 108 is connected to the 3rd input terminal of controller 100.
Wherein, main circuit includes low-noise amplifier 101, variable gain amplification coupling circuit 102, power amplifier 103, the first ADC
104 paths formed.
The main operational principle of the circuit of the embodiment of the present application is：Radiofrequency signal successively by low-noise amplifier 101, can
By controller 100 to it after variable-gain amplification coupling circuit 102, power amplifier 103, the first ADC 104 arrival controllers 100
It is demodulated.Average power detection circuit 105 is detected the size of radiofrequency signal and is sent to controller 10100, control
Device 100 controls pad value of the variable gain amplification coupling circuit 102 to radiofrequency signal according to testing result, so as to adjust low noise
The increasing of acoustic amplifier 101, variable gain amplification coupling circuit 102, power amplifier 103,104 place main circuits of the first ADC
Benefit.Specifically：
Low-noise amplifier 101
Low-noise amplifier 101 refers to the very low amplifier of noise coefficient.It is typically used as the high frequency of all kinds of radio receivers
Or intermediate-frequency preamplifier, and the amplifying circuit of high sensitivity electron detection equipment.In the occasion of amplification small-signal, amplification
Interference of the noise of device itself to signal may be very serious, and low-noise amplifier 101 can reduce this noise, to improve output
Signal-to-noise ratio.In the embodiment of the present application, low-noise amplifier 101 is used to receive radiofrequency signal by input terminal, and to radio frequency
Signal is amplified to improve signal-to-noise ratio.The radiofrequency signal can include Wireless Fidelity (Wireless Fidelity, WIFI),
Long Term Evolution (Long Term Evolution, LTE), worldwide interoperability for microwave accesses (Worldwide Interoperability
For Microwave Access, WIMAX) etc. have high peak-to-average power ratio modulated signal.The embodiment of the present application using WIFI signal as
Example illustrates.
Variable gain amplification coupling circuit 102
Variable gain amplification coupling circuit 102, for being declined according to the control signal of controller 100 to radiofrequency signal
Subtract；It is additionally operable to export the coupled signal of radiofrequency signal by coupled output, the signal strength of coupled signal is proportional to radio frequency letter
Number signal strength.
With reference to shown in Fig. 2, variable gain amplification coupling circuit 102 can include the first variable gain amplifier
(Variable Gain Amplifier, VGA) 1021,1022 and the 2nd VGA 1023 of coupler.Low-noise amplifier 101
Output terminal connects the input terminal of the first VGA 1021；The input terminal of the output terminal connection coupler 1022 of first VGA 1021；Coupling
The straight-through output terminal of clutch 1022 connects the input terminal of the 2nd VGA 1023, and the coupled output of coupler 1022 is as variable increasing
The input terminal of the coupled output connection average power detection circuit 105 of beneficial amplification coupling circuit 102；2nd VGA's 1023 is defeated
Input terminal of the outlet as the straight-through output terminal connection power amplifier 103 of variable gain amplification coupling circuit 102.Need to illustrate
Although only describing two VGA in example, the application does not limit the number of VGA, can be one or more,
Its overall attenuation scope bigger when having multiple.In addition, the application does not limit the series sequence of VGA and coupler yet, as long as full
The coupled signal exported after sufficient coupler coupling meets the input range of average power detection circuit 105, such as coupler
103 can also be located at after VGA 1023 or before VGA 1021.
VGA 1021 and VGA 1023
VGA 1021 and VGA 1023 is used to be amplified the radiofrequency signal of input according to the control signal of controller 100
Or decay.It can change the gain of main circuit, adjust dynamic range of signals, stablize output signal power.VGA passes through external number
The low and high level of word signal controls the size of gain.Its adjust gain stepping generally include 0.5dB, 1dB, 2dB, 4dB,
8dB and 16dB, maximum attenuation value can realize -31.5dB, if maximum gain is 18dB or so in the case of unattenuated,
It is exactly that gain ranging is -31.5dB~18dB.Its attenuation function is mainly utilized in the embodiment of the present application.
Coupler 1022
Coupler 1022 includes through path and coupling path, wherein, through path is used to pass through radiofrequency signal, and coupling is logical
Road is used for the coupled signal for producing radiofrequency signal, and the signal strength of coupled signal is proportional to the signal strength of radiofrequency signal,
Therefore the size of radiofrequency signal can be measured indirectly by measuring coupled signal.
Power amplifier 103
Power amplifier 103 is used for when RF signal power is smaller, it is amplified, is amplified to and is suitable for first
The input voltage range of ADC 104.
First ADC 104
First ADC 104 is used to obtain the first digital signal after carrying out analog-to-digital conversion to radiofrequency signal, and is sent to control
Device 100.Specifically for Time Continuous, amplitude also continuous analog signal are converted to time discrete, amplitude also discrete numeral
Signal, therefore, analog-to-digital conversion generally will be through 4 over sampling, holding, quantization and coding processes.In actual circuit, these processes
Have plenty of and merge what is carried out, for example, sampling and holding, quantify and coding is all often in transfer process while realizes.The
One ADC 104 can be the 80MSPS chips of 8bit sample rates.
Average power detection circuit 105
Average power detection circuit 105, can be the average power detection circuit using RMS rectifier, it can be used
Detected in the signal power of random waveform, RMS rectifier is the output voltage response device unrelated with waveform input signal.
In the embodiment of the present application, average power detection circuit 105 is used to be detected coupled signal, to obtain analog voltage letter
Number.
Since the frame structure features of WIFI signal determine, it is necessary to gain is locked within the leading very short time and is kept not
Become, general requirement is practiced complete in the 1us times of domain (Legacy Short Training Field, L-STF) part in Legacy
Into whole process.And the duration of average power detection and precision will directly determine the total time of this AGC.In addition, by
In WIFI signal using Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM)
Modulation system so that peak-to-average force ratio is very high, if by the way of peak value or log power detection, can cause the voltage letter of output
Number change as the peak value of input radio frequency signal is different, can not prepare to detect actual power.Directly affect and sentence below
Disconnected and controlling mechanism realization.
Using the size that is delayed as leading indicator when average power detection circuit 105 designs, using accuracy and dynamic range as
Secondary index.The size of delay is to directly affect the key index that can whole AGC frameworks meet the requirements.Meeting that delay is smaller
Index under consider dynamic range and accuracy index, dynamic range is bigger, and the sensitivity of detection is higher；Accuracy is higher,
The probability of erroneous judgement is with regard to smaller.With reference to shown in Fig. 3, Fig. 3 A are the time domain waveform of WIFI signal, and Fig. 3 B are average power detection electricity
Road 105 exports the oscillogram of corresponding analog voltage signal.Average power detection (is also named very effective using Ture RMS
Value) computational methods, average power detection circuit 105 can specifically pass through special chip or field programmable gate array
(Field Programmable Gate Array, FPGA) is calculated to realize, the embodiment of the present application is not construed as limiting.
Operational amplifier 106
Operational amplifier 106 is (referred to as " amplifier ") circuit unit with very high-amplification-factor.In actual circuit, lead to
Often certain function module is collectively constituted with reference to feedback network.It is a kind of amplifier with special Coupling circuit and feedback.Its
Output signal can be that input signal adds, subtracts or the result of the mathematical operation such as differential, integration.It can be with the embodiment of the present application
Analog voltage signal for being exported to average power detection circuit 105 is amplified, and is amplified to and is suitable for the 2nd ADC's 107
Input voltage range.
2nd ADC 107
The enlarged analog voltage signal that 2nd ADC 107 is used to export operational amplifier 106 carries out analog-to-digital conversion
After obtain the second digital signal, and be sent to controller 100.2nd ADC 107 can be the 80MSPS chips of 8bit sample rates.
Controller 100
Controller 100 can be Digital Signal Processing (Digital Signal Processing, DSP), field-programmable
Gate array (Field Programmable Gate Array, FPGA), Complex Programmable Logic Devices (Complex
Programmable Logic Device, CPLD), central processing unit (Central Processing Unit, CPU) etc..This
Application embodiment is illustrated by taking FPGA as an example.
Controller 100 is used to receive the second digital signal by the 2nd ADC 107；And adjusted according to the second digital signal
Pad value of the variable gain amplification coupling circuit 102 to radiofrequency signal is saved, is controlled with the gain to main circuit.
Automatic control loop is core mainly with controller 100 in whole agc circuit, and controller 100 receives the second number
After word signal, by it compared with internal threshold value.If the second digital signal is less than or equal to threshold value, adjust variable
Gain amplification coupling circuit is 0 to the pad value of radiofrequency signal, to keep maximum gain, that is, adjusts the first VGA 1021 and second
VGA 1023 is 0 to the pad value of radiofrequency signal；If the second digital signal is more than threshold value, controller 100 is according to the second number
Difference between word signal and threshold value adjusts pad value of the variable gain amplification coupling circuit 102 to radiofrequency signal.For
Scene shown in Fig. 2, since the maximum attenuation value of the first VGA 1021 is -31.5dB, when the difference is more than 31.5dB
Afterwards, then the pad value of the 2nd VGA 1023 of control, therefore the maximum pad value that can realize 63dB are started.
Since WIFI signal is the system of time division duplex (Time Division Duplex, TDD), and signal is to become in real time
Change, transmission link can be switched to after a frame end of receives link, variable gain amplification coupling should be controlled at this time
Circuit 102 is 0 to the pad value of radiofrequency signal, is maintained under maximum gain, waits next frame to receive and re-forms AGC controls
Circuit processed.
In waveform such as Fig. 4 A that normal radio frequency signal is tested when not decaying by variable gain amplification coupling circuit 102
It is shown.When control loop is formed, the waveform of radiofrequency signal is arrived by testing as shown in Figure 4 B.
Interference signal processing
Further, since the extensive use of WIFI, existing most application site all there are more or less interference signal,
Here interference includes the interference of other WIFI signals and the interference of non-WIFI signal.With reference to shown in Fig. 5, if first received
Useful radiofrequency signal and after adjusting AGC, has the arrival of more high reject signal, in order to achieve the purpose that each device of protection, it should weight
New adjustment AGC.Accordingly, it is possible to the useful radiofrequency signal that can cause to have locked can not demodulate.With reference to shown in Fig. 6, if
After first receiving compared with high reject signal and adjusting AGC, the less useful radiofrequency signal useful signal of intensity reaches, then can only protect
Hold current gain and demodulate, do not readjust AGC, the performance of a part may be sacrificed.Radio frequency is used because if maintaining
Signal will certainly cause interference signal bigger, cause the first ADC 104 to tend to saturation in optimum gain.
Big signal protection
Due to the uncertainty of external signal, it is understood that there may be the big signal of the big signals of many WIFI and non-WIFI, to protect
Demonstrate,proving the first ADC 104 will not damage, it should quickly judge this big signal and decay.The application by a comparator come
Realize the function.
Comparator 108
Comparator 108 be used to docking received high-power signal carry out it is quick relatively and judge, prevent the first ADC's 104
Input signal power is excessive and damages.If the analog voltage signal of the output of average power detection circuit 105 is more than comparator
108 thresholding, then comparator output comparative result signal, such as export high level signal.It should be noted that comparator 108 exists
It is optional in the application.
If controller 100 is additionally operable to receive the comparative result signal of comparator 108, variable gain amplification coupling is adjusted
Circuit 102 is closed to the pad value of radiofrequency signal to maximum, whole VGA pad values can be controlled to maximum or control section VGA
Pad value is to maximum.For example, it is assumed that the threshold value of comparator 108 is set to the corresponding magnitudes of voltage of -10dBm.If comparator 108 is defeated
Go out high level, controller 100 quickly control the pad value of the first VGA 1021 to be maximum, equivalent to by radio frequency signal attenuation
31.5dB。
Time delay is verified
It is most important to seek to ensure to complete control under sufficiently low time delay for the agc circuit of WIFI signal.Such as figure
Shown in 7, the time delay for the analog voltage signal that average power detection circuit 105 obtains WIFI radio-frequency signal detections is about
100ns。
Time delay inside FPGA is mainly the comparison of the second digital signal and threshold value and to the first VGA 1021 and
The output time delay of two VGA, 1023 output control signals, about in 100ns.
Other 2nd ADC 107 be a sample frequency be 80MHz clock, clock signal period 1/80MHz=
12.5ns, its fixed delay is the clock signal in 4 cycles, therefore the delay of the 2nd ADC 107 is 12.5ns*4=50ns.
Total time delay is 100ns+100ns+50ns=250ns, meets the design requirement of WIFI.
Schemes synthesis is verified
Most whole circuit is used to test the WIFI signal of different input power at last, model that can be from -95dBm to -10dBm
Enclose the response speed and control function of interior test agc circuit.
Signal, stepping 1dB are progressively increased since power -95dBm, the first ADC 104 for testing main circuit passes through FPGA
Signal level size.When RF signal power is -50dBm, AGC loop starts, when signal power is more than -50dBm
When, the first VGA 1021 and the 2nd VGA 1023 start to increase pad value, and overall gain is gradually reduced, and ensures the first ADC 104
Incoming level remain unchanged.
Progressively reduce signal, stepping 1dB since power -10dBm, the first ADC 104 for testing main circuit passes through FPGA
Signal level size.First VGA 1021 and the 2nd VGA 1023 starts to reduce pad value, and overall gain becomes larger, and ensures
The incoming level of first ADC 104 remains unchanged.When signal power is -50dBm, the first VGA 1021 and the 2nd VGA 1023
Pad value be 0, overall gain is maximum.When signal power is less than -50dBm, maximum gain work is kept.
Big signal authentication.Original state keeps power in -50dBm, when suddenly change power is to 0dBm, test and comparison device
108 output state is that the pad value of high level and the first VGA 1021 are -31.5dB.
The automatic growth control agc circuit that embodiments herein provides, couples radiofrequency signal to obtain coupling letter
Number, the signal strength of coupled signal is proportional to the signal strength of radiofrequency signal, and coupled signal is detected to obtain analog voltage signal,
Analog-to-digital conversion is carried out after being amplified to analog voltage signal and obtains digital signal, is adjusted according to digital signal on main circuit
The dough softening of VGA, i.e., adjust the gain of main circuit according to the signal strength of radiofrequency signal, realizes dynamic adjustment rf signal reception
The gain of link.
It should be noted that the average power detection and VGA circuit described in the embodiment of the present application can also be applied to send chain
Power amplifier (Power Amplifier, PA) the output terminal power detection on road and adjustment, keep output signal constant at one
Performance number.
The embodiment of the present application additionally provides a kind of AGC methods, applied to above-mentioned agc circuit, with reference to shown in Fig. 8, the party
Method includes：
S101, receive the second digital signal.
S102, adjust pad value of the variable gain amplification coupling circuit to radiofrequency signal according to the second digital signal.
In a kind of possible design, with reference to shown in Fig. 9, step S102 is specifically included：
S1021, by the second digital signal compared with threshold value.
If S1022, the second digital signal are less than or equal to threshold value, the variable gain amplification coupling circuit pair is adjusted
The pad value that the radiofrequency signal decays is 0.
If S1023, the second digital signal are more than threshold value, according to the difference between the second digital signal and threshold value
To adjust pad value of the variable gain amplification coupling circuit to radiofrequency signal.
In a kind of possible design, with reference to shown in Figure 10, this method further includes：
If S103, the comparative result signal for receiving comparator, variable gain amplification coupling circuit is adjusted to described
The pad value of radiofrequency signal is to maximum.
The embodiment of the present application additionally provides a kind of controller, applied to above-mentioned agc circuit, with reference to shown in Figure 11, the control
Device 100 processed includes：
Receiving unit 1001, for receiving the second digital signal；
Adjustment unit 1002, for adjusting variable gain amplification coupling circuit to radiofrequency signal according to the second digital signal
Pad value.
In a kind of possible design, adjustment unit 1102 is specifically used for：Second digital signal is compared with threshold value
Compared with；If the second digital signal is less than or equal to threshold value, adjusts the variable gain amplification coupling circuit and the radio frequency is believed
Number pad value be 0；If the second digital signal is more than threshold value, according to the difference between the second digital signal and threshold value
To adjust pad value of the variable gain amplification coupling circuit to radiofrequency signal.
In a kind of possible design, adjustment unit 110 is additionally operable to：If receiving the comparative result signal of comparator,
Variable gain amplification coupling circuit is then adjusted to the pad value of radiofrequency signal to maximum.
Since the controller in the embodiment of the present application can be applied to above-mentioned agc circuit, it can be obtained technology
Effect also refers to above-described embodiment, and details are not described herein for the embodiment of the present application.
The embodiment of the present application provides a kind of computer-readable recording medium for storing one or more programs, it is one or
Multiple programs include instruction, and described instruction makes the computer perform the side as described in Fig. 8-Figure 10 when executed by a computer
Method.
It is to be understood that in the various embodiments of the application, the size of the sequence number of above-mentioned each process is not meant to perform suitable
The priority of sequence, the execution sequence of each process should be determined with its function and internal logic, without the implementation of reply the embodiment of the present application
Process forms any restriction.
Those of ordinary skill in the art may realize that each exemplary list described with reference to the embodiments described herein
Member and algorithm steps, can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
Performed with hardware or software mode, application-specific and design constraint depending on technical solution.Professional technician
Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed
Scope of the present application.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method, can be with
Realize by another way.For example, apparatus embodiments described above are only schematical, for example, the unit
Division, is only a kind of division of logic function, can there is other dividing mode, such as multiple units or component when actually realizing
Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, equipment or unit
Close or communicate to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
In network unit.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the application can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units integrate in a unit.
In the above-described embodiments, can come wholly or partly by software, hardware, firmware or its any combination real
It is existing.When being realized using software program, can realize in the form of a computer program product whole or in part.The computer
Program product includes one or more computer instructions.On computers load and perform computer program instructions when, all or
Partly produce according to the flow or function described in the embodiment of the present application.The computer can be all-purpose computer, special meter
Calculation machine, computer network or other programmable devices.The computer instruction can be stored in computer-readable recording medium
In, or the transmission from a computer-readable recording medium to another computer-readable recording medium, for example, the computer
Instruction can pass through wired (such as coaxial cable, optical fiber, number from a web-site, computer, server or data center
Word user line (Digital Subscriber Line, DSL)) or wireless (such as infrared, wireless, microwave etc.) mode to another
A web-site, computer, server or data center are transmitted.The computer-readable recording medium can be computer
Any usable medium that can access or it can use the numbers such as server that medium integrates, data center comprising one or more
According to storage device.The usable medium can be magnetic medium (for example, floppy disk, hard disk, tape), optical medium (for example, DVD),
Or semiconductor medium (such as solid state hard disc (Solid State Disk, SSD)) etc..
The above, is only the embodiment of the application, but the protection domain of the application is not limited thereto, any
Those familiar with the art can readily occur in change or replacement in the technical scope that the application discloses, and should all contain
Cover within the protection domain of the application.Therefore, the protection domain of the application should be based on the protection scope of the described claims.
Claims (11)
- A kind of 1. automatic growth control agc circuit, it is characterised in that including：Controller, low-noise amplifier, variable gain are put Big termination power, power amplifier, the first analog-digital converter ADC, average power detection circuit, operational amplifier, the 2nd ADC； Wherein, the input terminal of the low-noise amplifier is used to receive radiofrequency signal, the output terminal connection institute of the low-noise amplifier State the first input end of variable gain amplification coupling circuit；The straight-through output terminal connection institute of the variable gain amplification coupling circuit State the input terminal of power amplifier；The output terminal of the power amplifier connects the input terminal of the first ADC；Described first The output terminal of ADC connects the first input end of the controller；The coupled output of the variable gain amplification coupling circuit connects Connect the input terminal of the average power detection circuit；The output terminal of the average power detection circuit connects the operational amplifier Input terminal；The output terminal of the operational amplifier connects the input terminal of the 2nd ADC；The output terminal of 2nd ADC connects Connect the second input terminal of the controller；The output terminal of the controller connects the second of the variable gain amplification coupling circuit Input terminal；The low-noise amplifier is used to receive radiofrequency signal and be amplified it；The variable gain amplification coupling circuit, declines the radiofrequency signal for the control signal according to the controller Subtract；It is additionally operable to export the coupled signal of the radiofrequency signal, the signal strength of the coupled signal by the coupled output It is proportional to the signal strength of the radiofrequency signal；The power amplifier is used to be amplified the radiofrequency signal；First ADC is used to obtain the first digital signal after carrying out analog-to-digital conversion to the radiofrequency signal, and is sent to described Controller；The average power detection circuit is used to be detected the coupled signal to obtain analog voltage signal；The operational amplifier is used to be amplified the analog voltage signal；2nd ADC is used to obtain the second digital signal after carrying out analog-to-digital conversion to the amplified analog voltage signal, And it is sent to the controller；The controller is used to receive second digital signal by the 2nd ADC；And according to second digital signal Adjust pad value of the variable gain amplification coupling circuit to the radiofrequency signal.
- 2. circuit according to claim 1, it is characterised in that the variable gain amplification coupling circuit include coupler, First VGA and the 2nd VGA, wherein, the output terminal of the low-noise amplifier connects the input terminal of the first VGA；Described The output terminal of one VGA connects the input terminal of the coupler；The straight-through output terminal of the coupler connects the defeated of the 2nd VGA Enter end, the coupled output of the coupler is described as the coupled output connection of the variable gain amplification coupling circuit It is worth the input terminal of power-sensing circuit；The output terminal of 2nd VGA is as the straight-through of the variable gain amplification coupling circuit Output terminal connects the input terminal of the power amplifier.
- 3. circuit according to claim 1, it is characterised in that the controller is specifically used for：By second digital signal compared with threshold value；If second digital signal is less than or equal to the threshold value, the variable gain amplification coupling circuit is adjusted to institute The pad value for stating radiofrequency signal is 0；If second digital signal is more than the threshold value, according between second digital signal and the threshold value Difference adjust pad value of the variable gain amplification coupling circuit to the radiofrequency signal.
- 4. circuit according to claim 1, it is characterised in that the agc circuit further includes comparator, the average power The output terminal of detection circuit is also connected with the input terminal of the comparator, and the comparator is connected to the 3rd input of the controller End, if the output signal of the average power detection circuit is more than the thresholding of the comparator, the comparator exports ratio Compared with consequential signal；If the controller is additionally operable to receive the comparative result signal of the comparator, the variable gain amplification is adjusted Termination power is to the pad value of the radiofrequency signal to maximum.
- A kind of 5. automatic growth control AGC methods, it is characterised in that applied to such as claim 1-4 any one of them AGC electricity Road, the agc circuit include variable gain amplification coupling circuit, the described method includes：Receive the second digital signal；Pad value of the variable gain amplification coupling circuit to the radiofrequency signal is adjusted according to second digital signal.
- 6. according to the method described in claim 5, it is characterized in that, the variable gain is adjusted according to second digital signal Amplification coupling circuit to the pad value of the radiofrequency signal, including：By second digital signal compared with threshold value；If second digital signal is less than or equal to the threshold value, the variable gain amplification coupling circuit is adjusted to institute It is 0 to state the pad value that radiofrequency signal decays；If second digital signal is more than the threshold value, according between second digital signal and the threshold value Difference adjust pad value of the variable gain amplification coupling circuit to the radiofrequency signal.
- 7. according to the method described in claim 5, it is characterized in that, the agc circuit further includes comparator, the method is also wrapped Include：If receiving the comparative result signal of the comparator, adjust the variable gain amplification coupling circuit and penetrated to described The pad value of frequency signal is to maximum.
- A kind of 8. controller, it is characterised in that applied to such as claim 1-4 any one of them agc circuit, the AGC electricity Road includes variable gain amplification coupling circuit, and the controller includes：Receiving unit, for receiving the second digital signal；Adjustment unit, for being adjusted according to second digital signal to the variable gain amplification coupling circuit to the radio frequency The pad value of signal.
- 9. controller according to claim 8, it is characterised in that the adjustment unit is specifically used for：By second digital signal compared with threshold value；If second digital signal is less than or equal to the threshold value, the variable gain amplification coupling circuit is adjusted to institute The pad value for stating radiofrequency signal is 0；If second digital signal is more than the threshold value, according between second digital signal and the threshold value Difference adjust pad value of the variable gain amplification coupling circuit to the radiofrequency signal.
- 10. controller according to claim 8, it is characterised in that the agc circuit further includes comparator, the adjusting Unit is additionally operable to：If receiving the comparative result signal of the comparator, adjust the variable gain amplification coupling circuit and penetrated to described The pad value of frequency signal is to maximum.
- A kind of 11. computer-readable recording medium for storing one or more programs, it is characterised in that one or more of journeys Sequence includes instruction, and described instruction makes the computer perform such as claim 5 to 7 any one of them when executed by a computer Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711292966.7A CN107911093A (en) | 2017-12-08 | 2017-12-08 | Automatic growth control agc circuit, method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711292966.7A CN107911093A (en) | 2017-12-08 | 2017-12-08 | Automatic growth control agc circuit, method and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107911093A true CN107911093A (en) | 2018-04-13 |
Family
ID=61854839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711292966.7A Pending CN107911093A (en) | 2017-12-08 | 2017-12-08 | Automatic growth control agc circuit, method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107911093A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574534A (en) * | 2018-07-02 | 2018-09-25 | 中国电子科技集团公司第三十四研究所 | A kind of radar antenna receives signal conditioner and preprocess method |
| CN110474691A (en) * | 2019-08-09 | 2019-11-19 | 三维通信股份有限公司 | Gain control method and device |
| CN111294086A (en) * | 2020-03-27 | 2020-06-16 | 京信通信系统（中国）有限公司 | Gain control method and communication system for a communication system |
| CN111769806A (en) * | 2020-06-05 | 2020-10-13 | 佛山市联动科技股份有限公司 | Power stabilizing method for power amplifier |
| CN112468213A (en) * | 2020-11-09 | 2021-03-09 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Signal receiving and transmitting control method of Beidou active antenna |
| CN112821902A (en) * | 2019-11-18 | 2021-05-18 | 海能达通信股份有限公司 | Receiver, control method of receiver and mobile terminal |
| CN113225798A (en) * | 2021-04-27 | 2021-08-06 | 无锡宇宁智能科技有限公司 | Wireless communication circuit with adjustable transmitting power and equipment terminal |
| CN115913417A (en) * | 2023-01-07 | 2023-04-04 | 成都川美新技术股份有限公司 | Device and method for improving detection range and precision of radio frequency power detector |
| CN118508896A (en) * | 2024-07-17 | 2024-08-16 | 南京典格通信科技有限公司 | Power amplifier power control protection circuit |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1307751A (en) * | 1999-02-24 | 2001-08-08 | 三菱电机株式会社 | Radio terminal device |
| US7409198B2 (en) * | 2005-08-30 | 2008-08-05 | Freescale Semiconductor, Inc. | Wideband variable gain amplifier in an ultra wideband receiver |
| CN101632222A (en) * | 2006-10-25 | 2010-01-20 | 传感器公司 | A kind of automatic gain control circuit and system thereof and auto gain control method |
| US8422970B1 (en) * | 2008-08-28 | 2013-04-16 | National Semiconductor Corporation | RMS power detection with signal-independent dynamics and related apparatus, system, and method |
| CN103636134A (en) * | 2011-09-26 | 2014-03-12 | 松下电器产业株式会社 | Reception circuit and receiver |
| WO2014116068A1 (en) * | 2013-01-25 | 2014-07-31 | Samsung Electronics Co., Ltd. | Method and apparatus for controlling gain in communicaton system supproting beam forming scheme |
| CN107276621A (en) * | 2017-06-01 | 2017-10-20 | 博流智能科技（南京）有限公司 | Take into account the receiver AGC system and method for plurality of application scenes |
-
2017
- 2017-12-08 CN CN201711292966.7A patent/CN107911093A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1307751A (en) * | 1999-02-24 | 2001-08-08 | 三菱电机株式会社 | Radio terminal device |
| US7409198B2 (en) * | 2005-08-30 | 2008-08-05 | Freescale Semiconductor, Inc. | Wideband variable gain amplifier in an ultra wideband receiver |
| CN101632222A (en) * | 2006-10-25 | 2010-01-20 | 传感器公司 | A kind of automatic gain control circuit and system thereof and auto gain control method |
| US8422970B1 (en) * | 2008-08-28 | 2013-04-16 | National Semiconductor Corporation | RMS power detection with signal-independent dynamics and related apparatus, system, and method |
| CN103636134A (en) * | 2011-09-26 | 2014-03-12 | 松下电器产业株式会社 | Reception circuit and receiver |
| WO2014116068A1 (en) * | 2013-01-25 | 2014-07-31 | Samsung Electronics Co., Ltd. | Method and apparatus for controlling gain in communicaton system supproting beam forming scheme |
| CN107276621A (en) * | 2017-06-01 | 2017-10-20 | 博流智能科技（南京）有限公司 | Take into account the receiver AGC system and method for plurality of application scenes |
Non-Patent Citations (3)
| Title |
|---|
| ANAND RAO 等: "A 4–6.4 GHz LC PLL With Adaptive Bandwidth Control for a Forwarded Clock Link", 《IEEE JOURNAL OF SOLID-STATE CIRCUITS》 * |
| 周志宇 等: "低频接收机自动增益控制电路的分析与设计", 《舰船电子工程》 * |
| 黄智伟: "《调制解调器电路设计》", 30 April 2009 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574534A (en) * | 2018-07-02 | 2018-09-25 | 中国电子科技集团公司第三十四研究所 | A kind of radar antenna receives signal conditioner and preprocess method |
| CN108574534B (en) * | 2018-07-02 | 2023-09-15 | 中国电子科技集团公司第三十四研究所 | Radar antenna received signal preprocessing device and preprocessing method |
| CN110474691A (en) * | 2019-08-09 | 2019-11-19 | 三维通信股份有限公司 | Gain control method and device |
| CN112821902A (en) * | 2019-11-18 | 2021-05-18 | 海能达通信股份有限公司 | Receiver, control method of receiver and mobile terminal |
| CN112821902B (en) * | 2019-11-18 | 2022-08-30 | 海能达通信股份有限公司 | Receiver, control method of receiver and mobile terminal |
| CN111294086A (en) * | 2020-03-27 | 2020-06-16 | 京信通信系统（中国）有限公司 | Gain control method and communication system for a communication system |
| CN111769806A (en) * | 2020-06-05 | 2020-10-13 | 佛山市联动科技股份有限公司 | Power stabilizing method for power amplifier |
| CN111769806B (en) * | 2020-06-05 | 2023-08-18 | 佛山市联动科技股份有限公司 | Power stabilizing method of power amplifier |
| CN112468213A (en) * | 2020-11-09 | 2021-03-09 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Signal receiving and transmitting control method of Beidou active antenna |
| CN113225798A (en) * | 2021-04-27 | 2021-08-06 | 无锡宇宁智能科技有限公司 | Wireless communication circuit with adjustable transmitting power and equipment terminal |
| CN115913417A (en) * | 2023-01-07 | 2023-04-04 | 成都川美新技术股份有限公司 | Device and method for improving detection range and precision of radio frequency power detector |
| CN118508896A (en) * | 2024-07-17 | 2024-08-16 | 南京典格通信科技有限公司 | Power amplifier power control protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107911093A (en) | Automatic growth control agc circuit, method and apparatus | |
| CN102781079B (en) | For the adaptive reception method of wireless telecommunications | |
| EP2730031B1 (en) | Non-foster circuit stabilization circuit and method | |
| CN109756240B (en) | Wireless communication receiver with gain control device and gain control method | |
| US7605731B2 (en) | Signal processor with a signal strength detection circuit that is coupled to a loop of an analog to digital converter | |
| CN107645299B (en) | Adaptive control circuit and control method for adaptive interference cancellation device | |
| WO2013116427A1 (en) | Method and apparatus to independently control front end gain and baseband gain | |
| CN103684306B (en) | Radio frequency feedforward power amplifier and loop self-adaptation control method | |
| US9479368B2 (en) | Method and apparatus for adjusting pre-distortion coefficient | |
| JP2014530572A (en) | Antenna power combiner with variable coupling coefficient | |
| CN107017917B (en) | A kind of power amplifier method and apparatus of tri- frequency automatic identification of TD-LTE | |
| CN106411435B (en) | A kind of RF transmitter and method of adjust automatically ACLR | |
| KR20140093626A (en) | System and method for determining channel loss in a dispersive communication channel at the nyquist frequency | |
| US11650236B2 (en) | Apparatus and method for measuring voltage standing wave ratio of antenna in wireless communication system | |
| CN108471318B (en) | Digital AGC control method and system based on FPGA | |
| CN111049487B (en) | Automatic gain control circuit and control method | |
| US7738594B2 (en) | Method to maintain RF power amplifier linearity in varying load VSWR conditions without isolator | |
| CN109951244B (en) | Power measurement and radio frequency receiving gain control method applied to channel simulator | |
| CN118826764A (en) | A radio frequency filter adaptive radio frequency filtering system | |
| CN103229421A (en) | Transmission power control circuit and transmission device, transmission power control method, program | |
| CN117580143B (en) | Automatic gain control method and system based on dual-mode communication unit | |
| CN113328845B (en) | Method and device for compensating flatness of downlink carrier | |
| US20080070512A1 (en) | Offset-frequency loop-back calibration | |
| CN111313952B (en) | Method, device, repeater and storage medium for intelligent adjustment of repeater gain | |
| CN117335762A (en) | Automatic gain control method, device and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180413 |