CN107222228A - Automatic gain control circuit and its control method, receiver - Google Patents

Automatic gain control circuit and its control method, receiver Download PDF

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Publication number
CN107222228A
CN107222228A CN201710585194.XA CN201710585194A CN107222228A CN 107222228 A CN107222228 A CN 107222228A CN 201710585194 A CN201710585194 A CN 201710585194A CN 107222228 A CN107222228 A CN 107222228A
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China
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amplifier
amplitude
level
signal
input
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CN201710585194.XA
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CN107222228B (en
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邹鹏良
张旭
陈光胜
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Shandong Electrician Intelligent Technology Co ltd
Shanghai Eastsoft Microelectronics Co ltd
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Shanghai Eastsoft Microelectronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

A kind of automatic gain control circuit and its control method, receiver, control circuit include：Controller, first order amplifier, the first low pass filter, second level amplifier, the second low pass filter, the first signal strength detection unit and secondary signal intensity detection unit, wherein：First signal strength detection unit, is adapted to detect for the amplitude of the output signal of first order amplifier and exports to controller；Secondary signal intensity detection unit, is adapted to detect for the amplitude of the output signal of second level amplifier and exports to controller；Controller, suitable for the amplitude according to first order amplifier output signal, the amplitude of second level amplifier output signal and the corresponding target voltage amplitude of pending signal, the amplitude of the output signal of first order amplifier is controlled to be in first object amplitude range, the amplitude of the output signal of second level amplifier is in the range of the second target amplitude.Such scheme is capable of the non-linear distortion probability of occurrence of step-down amplifier, improves receiver circuit reliability.

Description

Automatic gain control circuit and its control method, receiver
Technical field
The present invention relates to power line carrier communication field, more particularly to a kind of automatic gain control circuit and its controlling party Method, receiver.
Background technology
In power line carrier communication (Power Line Communication, PLC) field, for multi-stage cascade gain from In dynamic conditioned circuit, receiver is after the signal of emitter transmitting is received, it is necessary to be amplified place to the signal received Reason, is demodulated, decode etc. and handled accordingly again afterwards.
In receiver circuit, system noise depend primarily on first order amplifier, the noise of second level amplifier and The gain of first order amplifier.Amplified by reducing first order amplifier, the noise of second level amplifier and the increase first order The gain of device, can reduce the system noise of receiver circuit.Because the first order amplifier in receiver circuit, the second level are put Big device is usually active device composition, with nonlinear characteristic, when being amplified to input signal, it may appear that various Distortion, the signal for causing output is distorted signal or garbage signal, and then causes receiver circuit can not normal work.
The content of the invention
The embodiment of the present invention solve technical problem be how step-down amplifier non-linear distortion occur probability, improve The reliability of receiver circuit.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of automatic gain control circuit, including：Controller, First order amplifier, the first low pass filter, second level amplifier, the second low pass filter, analog-digital commutator, the first signal Intensity detection unit and secondary signal intensity detection unit, wherein：The first order amplifier, input inputs pending letter Number, output end and first low pass filter coupled are handled and exported suitable for being amplified to the pending signal；It is described Between first low pass filter, the input for being coupled in the output end of the first order amplifier and the second level amplifier, Low-pass filtering treatment is carried out suitable for the output signal to the first order amplifier；The second level amplifier, output end and institute The second low pass filter coupled is stated, suitable for carrying out secondary put to the pending signal Jing Guo the first order amplifier enhanced processing It is big and export；Second low pass filter, is coupled in the output end and the analog-digital commutator of the second level amplifier Input between, suitable for carrying out low-pass filtering treatment to the output signal of the second level amplifier；The analog-to-digital conversion dress Put, output end and the controller are coupled, suitable for by the output signal of the second level amplifier Jing Guo low-pass filtering treatment It is converted into digital signals format and exports to the controller；The first signal strength detection unit, is coupled in described first Between low pass filter and the controller, the output letter of the first order amplifier by low-pass filtering treatment is adapted to detect for Number amplitude and export to the controller；The secondary signal intensity detection unit, is coupled in second low pass filter Between the controller, the amplitude of output signal of the second level amplifier by low-pass filtering treatment is adapted to detect for simultaneously Export to the controller；The controller, control end respectively with the first order amplifier, the second level amplifier Control end, the first signal strength detection unit and secondary signal intensity detection unit coupling, suitable for according to described The amplitude of first order amplifier output signal, the amplitude of the second level amplifier output signal and default described pending The corresponding target voltage amplitude of signal, the first control signal of generation, the second control signal, and export first control signal extremely The control end of the first order amplifier, exports second control signal to the control end of the second level amplifier, difference Control the gain of the first order amplifier and the second level amplifier so that the output signal of the first order amplifier Amplitude is in first object amplitude range, and the amplitude of the output signal of the second level amplifier is in the second target amplitude model In enclosing, and the first order amplifier is corresponding linear in the first order amplifier in the first object amplitude range Amplify working region, the second level amplifier is in the corresponding line of the second level amplifier in second target amplitude Property amplification working region.
Optionally, the analog-digital commutator is analog-digital converter.
Optionally, the automatic gain control circuit also includes：With the first calibration of first low pass filter coupled Circuit, suitable for carrying out frequency compensation to first low pass filter.
Optionally, the automatic gain control circuit also includes：With the second calibration of second low pass filter coupled Circuit, suitable for carrying out frequency compensation to second low pass filter.
Optionally, the first order amplifier is differential circuit.
Optionally, the second level amplifier is differential circuit.
Optionally, the first signal strength detection unit, including：First current source, the first divider resistance, the second partial pressure Resistance, the 3rd divider resistance, the first level sensitive circuit, first comparator, the second comparator and the first digital encoder, its In：First current source, output end and the first end of first divider resistance are coupled；First divider resistance, second End is coupled with the first end of second divider resistance and the first input end of the first comparator；The second partial pressure electricity Resistance, the second end is coupled with the first end of the 3rd divider resistance and the first input end of second comparator；Described 3rd Divider resistance, the second end is coupled with ground；First level sensitive circuit, input and first low pass filter coupled, Output end is coupled with the second input of the first comparator and the second input of second comparator respectively, suitable for inspection Survey the amplitude for the output signal for obtaining the first order amplifier Jing Guo low-pass filtering treatment and be converted into the first DC level, And first DC level is exported respectively to the second input of the first comparator, second comparator second Input；The first comparator, the second end of first input end and first divider resistance is coupled, the second input and institute The output end coupling of the first level sensitive circuit is stated, output end and the input of first digital encoder are coupled, suitable for inciting somebody to action The voltage at the first divider resistance two ends is compared with first DC level, and exports the first comparative result to described First digital encoder；Second comparator, the second end of first input end and second divider resistance is coupled, and second is defeated Enter end and the output end of first level sensitive circuit is coupled, output end and the input coupling of first digital encoder Connect, suitable for the voltage at the second divider resistance two ends is compared with first DC level, and output second is compared As a result to first digital encoder；First digital encoder, suitable for first comparative result and described Two comparative results are encoded, and using the first obtained coding result as the first order amplifier output signal amplitude simultaneously Export to the controller.
Optionally, the secondary signal intensity detection unit, including：Second current source, the 4th divider resistance, the 5th partial pressure Resistance, the 6th divider resistance, second electrical level detection circuit, the 3rd comparator, the 4th comparator and the second digital encoder, its In：Second current source, output end and the first end of the 4th divider resistance are coupled；4th divider resistance, second End is coupled with the first end of the 5th divider resistance and the first input end of the 3rd comparator；The 5th partial pressure electricity Resistance, the second end is coupled with the first end of the 6th divider resistance and the first input end of the 4th comparator；Described 6th Divider resistance, the second end is coupled with ground；The second electrical level detects circuit, input and second low pass filter coupled, Output end is coupled with the second input of the 3rd comparator and the second input of the 4th comparator respectively, suitable for inspection Survey the amplitude for the output signal for obtaining the second level amplifier Jing Guo low-pass filtering treatment and be converted into the second DC level, And exported second DC level respectively to the second input of the 3rd comparator and the 4th comparator Two inputs；3rd comparator, the second end of first input end and the 4th divider resistance is coupled, the second input with The output end coupling of the second electrical level detection circuit, output end and the input of second digital encoder are coupled, and are suitable to The voltage at the 4th divider resistance two ends and second DC level are compared, and export the 3rd comparative result to institute State the second digital encoder；4th comparator, the second end of first input end and the 5th divider resistance is coupled, and second Input detects that the output end of circuit is coupled with the second electrical level, output end and the input coupling of second digital encoder Connect, suitable for the voltage at the 5th divider resistance two ends and second DC level are compared, and output the 4th is compared As a result to second digital encoder；Second digital encoder, suitable for the 3rd comparative result and described Four comparative results are encoded, and using the second obtained coding result as the second level amplifier output signal amplitude simultaneously Export to the controller.
The embodiment of the present invention additionally provides a kind of receiver, including the automatic gain control circuit described in any of the above-described kind.
The embodiment of the present invention additionally provides a kind of control method of automatic gain control circuit, the automatic growth control electricity Road includes：The first order amplifier and second level amplifier coupled successively, the control method includes：Obtain the first order The amplitude of amplifier output signal；According to the amplitude of the first order amplifier output signal after low-pass filtering treatment with And the corresponding target voltage amplitude of default pending signal, control the amplitude of the first order amplifier output signal to be in the In the range of one target amplitude；Obtain the amplitude of the second level amplifier output signal；According to after low-pass filtering treatment The amplitude of the second level amplifier output signal and the corresponding target voltage amplitude of the default pending signal, control The amplitude of the second level amplifier output signal is in the range of the second target amplitude；In the first object amplitude range The first order amplifier is in the corresponding Linear Amplifer working region of the first order amplifier, in second target amplitude The interior second level amplifier is in the corresponding Linear Amplifer working region of the second level amplifier.
Compared with prior art, the technical scheme of the embodiment of the present invention has the advantages that：
The output for detecting the first order amplifier after low-pass filtering treatment by the first signal strength detection unit is believed Number amplitude and export to controller, pass through secondary signal intensity detection unit and detect the second level after low-pass filtering treatment The amplitude of the output signal of amplifier is simultaneously exported to controller.Controller according to the amplitude of the output signal of first order amplifier, The amplitude and target voltage amplitude of the output signal of second level amplifier, control the amplitude of the output signal of first order amplifier In first object amplitude range, the amplitude of the output signal of second level amplifier is controlled to be in the second target amplitude scope It is interior so that first order amplifier and second level amplifier are amplified to meet target voltage amplitude in the signal to input Meanwhile, the non-linear distortion probability of occurrence of step-down amplifier improves receiver circuit reliability.
Further, first order amplifier and second level amplifier are differential circuit, can further reduce distortion The probability that situation occurs.
Further, frequency compensation is carried out to the first low pass filter by the first calibration circuit, passes through the second calibration circuit Frequency compensation is carried out to the second low pass filter, can avoid causing the frequency response of the first low pass filter inclined because of temperature change Move, the phenomenon of the frequency response skew of the second low pass filter occurs.
Brief description of the drawings
Fig. 1 is a kind of structural representation of automatic gain control circuit in the embodiment of the present invention；
Fig. 2 is the structural representation of another automatic gain control circuit in the embodiment of the present invention；
Fig. 3 is a kind of structural representation of first signal strength detection unit in the embodiment of the present invention；
Fig. 4 is a kind of fundamental diagram of first signal strength detection unit in the embodiment of the present invention；
Fig. 5 is a kind of output waveform figure of first digital encoder in the embodiment of the present invention；
Fig. 6 is a kind of structural representation of secondary signal intensity detection unit in the embodiment of the present invention；
Fig. 7 is a kind of fundamental diagram of secondary signal intensity detection unit in the embodiment of the present invention；
Fig. 8 is a kind of output waveform figure of second digital encoder in the embodiment of the present invention；
Fig. 9 is a kind of flow chart of the control method of automatic gain control circuit in the embodiment of the present invention；
Figure 10 is a kind of workflow diagram of automatic gain control circuit in the embodiment of the present invention.
Embodiment
For existing receiver circuit, the system noise in receiver circuit meets following expression：
In formula (1), F is the system noise factor of receiver circuit, F1For the noise coefficient of first order amplifier, F2For The noise coefficient of two-stage amplifier, F3For the noise coefficient of third level amplifier, GP1For the gain of first order amplifier, GP2For The gain of two-stage amplifier.
It was found from from above formula (1), in receiver circuit, system noise depend primarily on first order amplifier noise, The gain of the noise and first order amplifier of second level amplifier.Under normal circumstances, by reducing first order amplifier, second The noise of level amplifier, increases the gain of first order amplifier, to reduce the system noise in receiver circuit.
However, in actual applications, first order amplifier is generally made up of with second level amplifier active device, due to having Source device has nonlinear characteristic, therefore can produce various distortions in amplification process, for example, when input to the first order Amplifier, second level amplifier input signal it is excessive when, it may appear that supersaturated distortion, cause output signal-to-noise ratio to reduce, even Cause receiver circuit can not normal work.
In embodiments of the present invention, the amplitude to first order amplifier and the output signal of second level amplifier is carried out respectively Detect and export to controller, the amplitude of the output signal of controller control first order amplifier is in first object amplitude range It is interior, control second level amplifier output signal amplitude be in the second target amplitude in the range of so that first order amplifier with And second level amplifier is while the signal to input is amplified to meet target voltage amplitude, the non-thread of step-down amplifier Property distortion probability of occurrence, improve receiver circuit reliability.
It is understandable to enable above-mentioned purpose, feature and beneficial effect of the invention to become apparent, below in conjunction with the accompanying drawings to this The specific embodiment of invention is described in detail.
Reference picture 1, the embodiments of the invention provide a kind of automatic gain control circuit.Automatic gain control circuit includes： Controller 101, first order amplifier 102, the first low pass filter 107, second level amplifier 103, the second low pass filter 108th, analog-digital commutator 106, the first signal strength detection unit 104 and secondary signal intensity detection unit 105.
In actual applications, N is setoTotal noise power is exported for receiver circuit, then receiver circuit can detect The power of minimum incoming signal level is：
In formula (2), Pin,minFor the power of detectable minimum incoming signal level, GPFor total increasing of receiver circuit Benefit, Po,minFor the power of minimum output signal level, NoTotal noise power is exported for receiver,For receiver circuit Output signal-to-noise ratio.
It was found from from formula (2), in the case where receiver circuit output total noise power is certain, the output of receiver circuit Signal to noise ratio is higher, just can guarantee that higher dynamic range.In the case of input impedance and output impedance determination, power signal Voltage signal can be converted to be handled.Therefore, in embodiments of the present invention, using first order amplifier 102 and second Two stage gain Enlargement Designs of level amplifier 103, cause dual-stage amplifier to work in the case where ensureing that gain is enough Preferably amplify in the linearity in interval.According to real application systems demand, by the present invention program, more stages can be increased Amplifier or gain, the low pass filter of more stages and calibration circuit, realize higher dynamic range.
Understand in actual applications, the pending signal Signal of input to first order amplifier 102 can be receiver Signal after the received process channel sent from emitter, pending signal Signal is differential signal.When connecing When signal after the process channel sent from emitter that receipts machine is received is single-ended signal, single-ended transfer difference can be passed through Circuit is handled the single-ended signal received so that is inputted to the pending signal Signal of first order amplifier 102 and is become Into differential signal.Meanwhile, the DC level deviation to differential signal is handled.
Under normal circumstances, the intensity for the pending signal Signal that receiver is received is weaker, therefore, and receiver is being received To after pending signal Signal, first treat process signal Signal and be amplified processing, afterwards again to enhanced processing after Pending signal Signal the processing such as be demodulated, decode.
Therefore, receiver is put when receiving pending signal Signal by first order amplifier 102 and the second level Big device 103, processing is amplified to the pending signal Signal received.In embodiments of the present invention, waiting of receiving is located Reason signal is first inputted to first order amplifier 102.
In specific implementation, first order amplifier 102 can include input, output end and control end.The first order is put The input of big device 102 inputs pending signal, and output end is coupled with the first low pass filter 107, control end and controller 101 Coupling.First order amplifier 102 is suitable to be amplified the pending signal Signal of input processing, and by treating after amplification Process signal is exported to the first low pass filter 107.
First low pass filter 107 can be coupled in the output end and second level amplifier 103 of first order amplifier 102 Between input, low-pass filtering treatment is carried out suitable for the output signal to first order amplifier 102.
In a particular application, the first low pass filter 107 can be made up of components such as resistance, electric capacity.First low pass filtered The frequency filtering of ripple device 107 can be configured according to actual application scenarios, the frequency filtering of the first low pass filter 107 With the frequency dependence of pending signal.For different receivers, because the frequency of its pending signal received is different, because The frequency filtering of this each self-corresponding first low pass filter 107 may also be different.
Second level amplifier 103 can include input, output end and control end.The input of second level amplifier 103 End is coupled with the output end of the first low pass filter 107, and output end is coupled with the second low pass filter 108, suitable for passing through the The filtered signal of one low pass filter 107 is amplified processing.
In specific implementation, the second low pass filter 108 can be coupled in output end and the control of second level amplifier 103 Between device 101, low-pass filtering treatment is carried out suitable for the output signal to second level amplifier 103.That is, controller 101 The signal received is the signal after the second low pass filter filtering process.
In a particular application, the second low pass filter 108 can be made up of components such as resistance, electric capacity.Second low pass filtered The frequency filtering of ripple device 108 can be configured according to actual application scenarios, the frequency filtering of the second low pass filter 108 With the frequency dependence of pending signal.For different receivers, because the frequency of its pending signal received is different, because The frequency filtering of this each self-corresponding second low pass filter 108 may also be different.
In specific implementation, first order amplifier 102 can be independently arranged with the first low pass filter 107, i.e. the first order The low pass filter 107 of amplifier 102 and first is two independent units.First order amplifier 102 can also be with the first low pass Wave filter 107 is integrated in same chip or circuit.
Correspondingly, second level amplifier 103 can be independently arranged with the second low pass filter 108, can also with it is second low Bandpass filter 108 is integrated in same chip or circuit.
In specific implementation, the first signal strength detection unit 104 is coupled in the first low pass filter 107 and controller Between 101, the output letter for the first order amplifier 102 being adapted to detect for after the low-pass filtering treatment of the first low pass filter 107 Number amplitude and export to controller 101 so that controller 101 can know the first order after low-pass filtering treatment The amplitude of the output signal of amplifier 102.
Secondary signal intensity detection unit 105 is coupled between the second low pass filter 108 and controller 101, suitable for inspection Survey amplitude and the output of the output signal of the second level amplifier 103 after the low-pass filtering treatment of the second low pass filter 108 To controller 101, so that controller 101 can know the defeated of the second level amplifier 103 after low-pass filtering treatment Go out the amplitude of signal.
Due to the output signal of output signal and the second level amplifier 103 of first order amplifier 102 may exist compared with Big interference noise, if the first signal strength detection unit 104 directly detects the width of the output signal of first order amplifier 102 Degree, may have larger error.Correspondingly, if secondary signal intensity detection unit 105 directly detects second level amplifier The amplitude of 103 output signal, it is also possible to there is larger error.Therefore, in embodiments of the present invention, amplify in the first order The output end of device 102 sets the first low pass filter 107, filters out most of noise in the output signal of first order amplifier 102； In the second level, the output end of amplifier 103 sets the second low pass filter 108, filters out in the output signal of second level amplifier 103 Most of noise.By setting the first low pass filter 107 and the second low pass filter 108, it can make it that the first signal is strong Degree detection unit 104 can more accurately detect the signal amplitude after the amplification of first order amplifier 102, and cause second Signal strength detection unit 105 can more accurately detect the signal amplitude after the amplification of second level amplifier 103.
That is, in embodiments of the present invention, what the first signal strength detection unit 104 was detected is low by first The amplitude of the output signal of first order amplifier 102 after the low-pass filtering treatment of bandpass filter 107, rather than directly detect first The amplitude of the output signal of level amplifier 102.Correspondingly, what secondary signal intensity detection unit 105 was detected is by second The amplitude of the output signal of second level amplifier 103 after the low-pass filtering treatment of low pass filter 108, rather than directly detect The amplitude of the output signal of two-stage amplifier 103.
In specific implementation, the first order that controller 101 can be detected according to the first signal strength detection unit 104 is put The output for the second level amplifier 103 that the amplitude of the output signal of big device 102, secondary signal intensity detection unit 105 are detected The amplitude of signal and the corresponding target voltage amplitude of pending signal, the first control signal of generation and the second control signal. Controller 101 exports the first control signal of generation to the control end of first order amplifier 102, controls first order amplifier 102 gain so that the amplitude of the output signal of first order amplifier 102 is in first object amplitude range.Controller 101 Second control signal of generation is exported to the gain that second level amplifier 103 is controlled to the control end of second level amplifier 103, So that the amplitude of the output signal of second level amplifier 103 is in the range of the second target amplitude.In the first object amplitude In the range of the first order amplifier 102 be in the corresponding Linear Amplifer working region of first order amplifier 102, described second The second level amplifier 103 is in the corresponding Linear Amplifer working region of second level amplifier 103 in target amplitude.
Controller 101 is by controlling the amplitude of the output signal of first order amplifier 102 to be in first object amplitude range It is interior, to control the output signal of first order amplifier 102 to occur without distortion.Controller 101 is by controlling second level amplifier 103 Output signal amplitude be in the second target amplitude in the range of, to control the output signal of second level amplifier 103 to occur without Distortion.As can be seen here, the control of controller 101 is passed through, it is ensured that first order amplifier 102 and second level amplifier 103 are located In Linear Amplifer working region.
Controller 101 is always according to the corresponding target voltage amplitude of default pending signal, control first order amplifier 102 Output signal amplitude and second level amplifier 103 output signal amplitude.Ensure first order amplifier 102 and While second level amplifier 103 is in Linear Amplifer working region, it is ensured that pending signal passes through first order amplifier 102 After second level amplifier 103, corresponding voltage reaches target voltage amplitude, so that controller 101 can be handled.
In actual applications, the target voltage amplitude of pending signal can be that controller 101 is set in advance.For example, Controller 101 sets the target voltage amplitude of pending signal according to the processing parameter of practical application.
In specific implementation, controller 101 is controlling first order amplifier according to the target voltage amplitude of pending signal When 102 gain and the gain of second level amplifier 103, it is possible that following situation：The control of controller 101 first order is put It is that the gain that second level amplifier 103 is configured is more than second level amplifier 103 after the gain of device 102 is some value greatly The maxgain value of linear operating region, or the gain configured for second level amplifier 103 are less than second level amplifier 103 The minimum gain value of linear operating region.That is, controller 101 be first order amplifier 102 configure gain it is larger when, It is possible to occur that the gain configured for second level amplifier 103 is smaller, even less than the linear work of second level amplifier 103 The situation of the minimum gain value in region；Controller 101 be second level amplifier 103 configure gain it is smaller when, it is possible to occur The gain configured for second level amplifier 103 is larger, and the even greater than linear operating region of second level amplifier 103 is most increased The situation of benefit value.
When there is above-mentioned situation, second level amplifier 103 can not be operated in linear operating region, cause receiver reliable Property is poor.
In specific implementation, linear work is not in for the gain of the configuration of second level amplifier 103 when controller 101 detects When making in region, controller 101 can configure gain for first order amplifier 102 again.Controller 101 is being the first order again After the configuration gain of amplifier 102, gain is configured for second level amplifier 103 again, to cause the second level reconfigured to amplify The gain of device 103 is in the corresponding linear operating region of second level amplifier 103.
Specifically, when controller 101 detects the gain configured for second level amplifier 103 more than second level amplifier During the maxgain value of 103 linear operating region, controller 101 configures gain for first order amplifier 102 again, increases it The preceding gain configured by first order amplifier 102.Again it is being after first order amplifier 102 configures gain, due to the first order The gain increase of amplifier 102, therefore controller 101 is the gain reduction that reconfigures of second level amplifier 103, therefore can be by The Gain tuning configured for second level amplifier 103 is to the linear operating region of second level amplifier 103.
It is less than the linear of second level amplifier 103 when controller 101 detects for the gain of the configuration of second level amplifier 103 During the minimum gain value of working region, controller 101 configures gain for first order amplifier 102 again, is first before reduction The gain that level amplifier 102 is configured.Again it is being after first order amplifier 102 configures gain, due to first order amplifier 102 Gain reduction, therefore controller 101 is the gain increase that second level amplifier 103 is reconfigured, therefore can be put the second level The Gain tuning that big device 103 is configured is to the linear operating region of second level amplifier 103.
Understand in actual applications, the index parameter of receiver circuit is in addition to system noise, in addition to sensitivity.Connect The sensitivity definition for receiving electromechanical road is as follows：Under conditions of given output signal-to-noise ratio, receiver circuit can be detected most Low input-signal level.It can be seen from the definition of the sensitivity of receiver circuit, sensitivity with it is defeated required by receiver circuit Go out signal quality, namely output signal-to-noise ratio is compared, also the system noise to receiver circuit in itself is related.
In actual applications, the output signal of first order amplifier 102 and second level amplifier 103 is usually simulation letter Number, and controller 101 generally carries out the processing of data signal.Consequently, to facilitate controller 101 can carry out normal processing behaviour Make, it is necessary to which the output signal of second level amplifier 103 is converted into digital signals format by analog signal format.
In specific implementation, analog-digital commutator 106 can be arranged on the second low pass filter 108 and controller 101 it Between, the output signal of the second level amplifier 103 after low-pass filtering treatment is converted into digital letter from analog signal format Number form, and the output signal of obtained digital signals format is exported to controller 101.Controller 101 is to number format Output signal carries out the processing such as demodulation accordingly, decoding, and specific handling process is not repeated.
In specific implementation, analog-digital commutator 106 is used to transmit jitter or the relatively low channel ring of signal to noise ratio In border, by way of the signal amplitude integration within to a period of time, calculate the energy of signal and be converted into data signal lattice Formula exports to controller 101 to realize automatic growth control.By using analog-digital commutator 106 so that the embodiment of the present invention The automatic gain control circuit of middle offer be able to can also carry out adaptive in the relatively low environment of jitter or signal to noise ratio The Gain tuning answered.
In a particular application, analog-digital commutator 106 can be analog-digital converter, or other can realize modulus The component or circuit of translation function.
Reference picture 2, gives the structural representation of another automatic gain control circuit in the embodiment of the present invention.Below Illustrated with reference to Fig. 1.
In actual applications, due to the first low pass filter 107 and the second low pass filter 108 may by resistance, The components such as electric capacity are constituted, and under different temperature values, the electrical parameter of the component such as resistance, electric capacity can occur accordingly to change Become, therefore when temperature value changes, the frequency filtering of the first low pass filter 107 may change, the second low pass filter 108 frequency filtering be able to may also change.
To avoid the frequency filtering of the first low pass filter 107 and the frequency filtering of the second low pass filter 108 from occurring Change, cause the part useful signal in pending signal to be filtered out, in specific implementation, the first calibration circuit can be set 109 and second calibration circuit 110, wherein：First calibration circuit 109 is coupled with the first low pass filter 107, the second calibration electricity Road 110 is coupled with the second low pass filter 108.
First calibration circuit 109 can carry out frequency compensation when temperature changes to the first low pass filter 107. Second calibration circuit 110 can carry out frequency compensation when temperature changes to the second low pass filter 108.Actually should In, the first calibration calibration of circuit 109 and second circuit 110 can be temperature-compensation circuit, when the temperature varies, Frequency compensation is carried out to the first calibration calibration circuit 110 of circuit 109 and second respectively.
Frequency compensation is carried out by first calibration 109 pair of first low pass filter 107 of circuit, passes through the second calibration circuit 110 pair of second low pass filter 108 carries out frequency compensation, can avoid causing the first low pass filter 107 because of temperature change Frequency response skew, the second low pass filter 108 frequency response skew phenomenon occur.
Understand in actual applications, controller 101 is typically that data signal is handled.Therefore, the first signal intensity Detection unit 104 can be quantified the amplitude of the output signal of the first order amplifier 102 detected, generate data signal And export to controller 101.
For example, using 0.5V DC voltage as one grade, when the amplitude pair for the output signal for detecting first order amplifier 102 When the DC voltage answered is less than or equal to 0.5V, the data signal of generation is binary number 000；When detecting first order amplifier When the corresponding DC voltage of amplitude of 102 output signal is more than 0.5V and is less than or equal to 1V, the data signal of generation is two System number 001；When detecting the corresponding DC voltage of the amplitude of output signal of first order amplifier 102 more than 1V, generation Data signal be 010.
Correspondingly, secondary signal intensity detection unit 105 can also believe the output of the second level amplifier 103 detected Number amplitude quantified, generation data signal is simultaneously exported to controller 101.Specifically, to the output of second level amplifier 103 When the amplitude of signal is quantified, different voltage gears, the different binary system of different voltage gear correspondences can also be set Number, so as to the quantized value of the amplitude of the output signal that obtains second level amplifier 103.
In specific implementation, controller 101 receive the first signal strength detection unit 104 output quantized value and After the quantized value that secondary signal intensity detection unit 105 is exported, with reference to the target voltage amplitude of pending signal, generate respectively First control signal is simultaneously exported to first order amplifier 102, is generated the second control signal and is exported to second level amplifier 103.
First order amplifier 102 is under the control of the first control signal, according to the corresponding gain of the first control signal to defeated The pending signal entered carries out corresponding enhanced processing.Second level amplifier 103 is under the control of the second control signal, according to The corresponding gain of two control signals carries out corresponding secondary enhanced processing to the output signal of first order amplifier 102.
In specific implementation, the first control signal and the second control signal can be control word format.For difference The first control signal, the output gain of first order amplifier 102 is different.Correspondingly, for the second different control signals, the The output gain of two-stage amplifier 103 is also differed.
In an embodiment of the present invention, with reference to table 1 below, a kind of first control signal and first order amplifier 102 are given Output gain mapping table.
Table 1
First control signal Output gain
000 0dB
001 6dB
010 12dB
011 15dB
100 18dB
101 21dB
110 It is unused, available for extending
111 It is unused, available for extending
In table 1, when the first control signal is 000, the output gain of first order amplifier 102 is 0dB；When the first control When signal is 001, the output gain of first order amplifier 102 is 6dB；When the first control signal is 010, first order amplifier 102 output gain is 12dB；When the first control signal is 011, the output gain of first order amplifier 102 is 15dB；When When first control signal is 100, the output gain of first order amplifier 102 is 18dB；When the first control signal is 101, the The output gain of first stage amplifier 102 is 21dB；When the first control signal is 110 or 111, this programme is unused, can be used for Extend other gain shifts or decay gear.
It is understood that in actual applications, the first control signal that controller 101 is exported can also be other lattice Formula, the value of the first control signal can also be other values, as long as the output gain of first order amplifier 102 can be controlled.
In an embodiment of the present invention, with reference to table 2, a kind of second control signal and second level amplifier 103 are given The mapping table of output gain.
Table 2
In table 2, when the second control signal is 00, the output gain of second level amplifier 103 is 0dB；When the second control When signal is 01, the output gain of second level amplifier 103 is 6dB；When the second control signal is 10, second level amplifier 103 output gain is 12dB；When the second control signal is 11, this programme is unused, can be used for extending other gain shifts Or decay gear.
It should be noted that table 1, table 2 are by way of example only.In specific implementation, the first control signal and output gain Mapping relations, the mapping relations of the second control signal and output gain are not limited in being illustrated in the above embodiment of the present invention Table 1 and table 2, table 1 do not constitute any limitation with table 2 to the embodiment of the present invention.
In specific implementation, controller 101 can be precomputed according to the corresponding target voltage amplitude of pending signal The corresponding target gain of first order amplifier 102 and the corresponding target gain of second level amplifier 103, and then obtain the first order Target amplitude corresponding to the corresponding target gain of amplifier 102, and the corresponding target gain of second level amplifier 103 institute are right The target amplitude answered.
Controller 101 is getting the first order amplifier after the low-pass filtering treatment of the first low pass filter 107 After the amplitude of 102 output signals, you can by the amplitude of the output signal of first order amplifier 102 after low-pass filtering treatment It is compared with the corresponding target amplitude of first order amplifier 102.When the first order amplifier 102 after low-pass filtering treatment When the amplitude of output signal is less than the first order 102 corresponding target amplitude of amplifier, controller 101 can generate the first control letter Number and export to first order amplifier 102 control end.First order amplifier 102 is after the first control signal is received, you can Increase output gain.
For example, the output gain of first order amplifier 102 is 6dB, the first order amplifier after low-pass filtering treatment The quantized value of the actual margin of 102 output signal is binary number 000, the corresponding target amplitude of first order amplifier 102 Quantized value is binary number 010, therefore, it can judge that the output gain of first order amplifier 102 is less than first order amplifier 102 Target gain.It is binary number 010 that controller 101, which generates the information carried in the first control signal, the first control signal,.The Primary controller 101 is received after the first control signal, and output gain is adjusted into 12dB from 6dB.
When the amplitude of the output signal of first order amplifier 102 after low-pass filtering treatment is more than first order amplifier During 102 corresponding target amplitude, controller 101 can generate the first control signal and export to the control of first order amplifier 102 End processed.First order amplifier 102 is after the first control signal is received, you can reduction output gain.
For example, the output gain of first order amplifier 102 is 15dB, the first order amplifier after low-pass filtering treatment The amplitude quantizing of 102 output signal is binary number 010, and the quantized value of the corresponding target amplitude of first order amplifier 102 is 001.It is binary number 010 that controller 101, which generates the information carried in the first control signal, the first control signal,.First order control Device 101 processed is received after the first control signal, and output gain is adjusted into 12dB from 15dB.
Correspondingly, controller 101 is getting the output signal of second level amplifier 103 after low-pass filtering treatment After amplitude, you can amplify the amplitude of the output signal of second level amplifier 103 after low-pass filtering treatment and the second level The corresponding target amplitude of device 103 is compared.When the width of the output signal of second level amplifier 103 after low-pass filtering treatment When degree is less than the second level 103 corresponding target amplitude of amplifier, controller 101 can generate the second control signal and export to the The control end of two-stage amplifier 103, the corresponding output gain of the second control signal becomes big.Second level amplifier 103 is being received After second control signal, you can increase output gain.When the output signal of second level amplifier 103 after low-pass filtering treatment Amplitude be more than the second level 103 corresponding target amplitude of amplifier when, controller 101 can generate the second control signal and export To the control end of second level amplifier 103, the corresponding output gain of the second control signal diminishes.Second level amplifier 103 is connecing Receive after the second control signal, you can reduction output gain.
It should be noted that the automatic gain control circuit provided in the embodiment of the present invention, can also put including more stages Big device and more low pass filters, are not limited in the dual-stage amplifier that is provided in the above embodiment of the present invention and two low Bandpass filter.
In specific implementation, for every first stage amplifier in automatic gain control circuit, it can set therewith one by one Corresponding low pass filter, to carry out low-pass filtering treatment to the output of amplifier.For every first stage amplifier, controller can be with According to the amplitude of amplifier output signals at different levels and the corresponding target voltage amplitude of default pending signal, respectively generation control Signal, to control every one-level in casacade multi-amplifier so that the amplitude of the output signal per first stage amplifier is in itself Linear Amplifer working region.
Another embodiment that the present invention is provided, automatic gain control circuit includes first order amplifier, second level amplifier And third level amplifier, namely amount to third stage amplifier.Correspondingly, automatic gain control circuit includes the first LPF Device, the second low pass filter and the 3rd low pass filter.The output end of first order amplifier is defeated with the first low pass filter Enter end coupling, the output end of the first low pass filter is coupled with the input of second level amplifier, the output of second level amplifier End and the input of the second low pass filter are coupled, the output end of the second low pass filter and the input coupling of third level amplifier Connect, the output end of third level amplifier and the input of the 3rd low pass filter are coupled, and the output end of the 3rd low pass filter is led to Cross after analog-digital commutator with controller couple.Controller amplifies according to the amplitude output signal of first order amplifier, the second level Amplitude output signal, the amplitude output signal of third level amplifier and the corresponding target voltage amplitude of pending signal of device, The first control signal is generated respectively and is exported to first order amplifier, the second control signal of generation and is exported to second level amplification Device, the 3rd control signal of generation are simultaneously exported to third level amplifier so that the amplitude of the output signal of first order amplifier is in The corresponding Linear Amplifer working region of first order amplifier, the amplitude of the output signal of the second amplifier are in second level amplifier Corresponding Linear Amplifer working region, that the amplitude of the output signal of third level amplifier is in third level amplifier is corresponding linear Amplify working region.
In specific implementation, the amplifier that first order amplifier 102 can be realized for differential circuit, second level amplifier 103 amplifiers that can also be realized for differential circuit.
Understand in actual applications, differential circuit shows input and output characteristics, the i.e. f (- x) of a kind of " odd symmetry " =-f (x).Taylor expansion is odd function, and all even order terms are 0, and the differential circuit driven by differential wave will not produce idol Subharmonic.In the case where providing identical voltage gain with output voltage swing, compared with the related circuit of Single-end output, differential electricity The distortion on road is smaller, and more preferably, dynamic range is bigger for common-mode rejection ratio, PSRR performance.
Therefore, in an embodiment of the present invention, first order amplifier 102 is the amplifier that differential circuit is realized, the second level The amplifier that amplifier 103 is also realized for differential circuit.
The the first signal strength detection unit and secondary signal intensity that are there is provided in the above embodiment of the present invention are examined below Unit is surveyed to illustrate.Reference picture 3, the structure for giving a kind of first signal strength detection unit in the embodiment of the present invention is shown It is intended to.Illustrated with reference to Fig. 1 and Fig. 2.
In specific implementation, the first signal strength detection unit 104 can include：First current source 21, the first partial pressure electricity Hinder the 22, second divider resistance 23, the 3rd divider resistance 24, the first level sensitive circuit 25, first comparator 26, the second comparator 27 and first digital encoder 28.
The output end of first current source 21 and the first end of the first divider resistance 22 are coupled.
Second end of the first divider resistance 22 and the first end of the second divider resistance 23 are coupled；The of second divider resistance 23 Two ends and the first end of the 3rd divider resistance 24 are coupled, and the second end and the ground of the 3rd divider resistance 24 are coupled, namely：First partial pressure Resistance 22, the second divider resistance 23 and the 3rd divider resistance 24 are connected.
The input of first level sensitive circuit 25 is coupled with the first low pass filter 107, and output end compares with first respectively The second input coupling of the second input, the second comparator 27 compared with device 26.First level sensitive circuit 25, which can be detected, to be obtained The amplitude of the output signal of the first order amplifier 102 for low-pass filtering treatment of learning from else's experience simultaneously is converted into the first DC level, and will First DC level is exported to the second input of the second input of first comparator 26, the second comparator 27 respectively.
The second end coupling of the first input end of first comparator 26 and the first divider resistance 22, the second input and first The output end coupling of level sensitive circuit 25, output end and the input of the first digital encoder 28 are coupled.First comparator 26 The voltage at the two ends of the first divider resistance 22 and the first DC level are compared, the first comparative result is obtained, and first is compared Relatively result is exported to the first digital encoder 28.
The second end coupling of the first input end of second comparator 27 and the second divider resistance 23, the second input and first The output end coupling of level sensitive circuit 25, output end and the input of the first digital encoder 28 are coupled.Second comparator 27 The voltage at the two ends of the second divider resistance 23 and the second DC level are compared, the second comparative result is obtained, and second is compared Relatively result is exported to the first digital encoder 28.
First digital encoder 28, suitable for receiving the first comparative result, the second comparator 27 that first comparator 26 is exported Second comparative result of output, and the first comparative result and the second comparative result are encoded, obtain the first coding result.The One digital encoder 28 is using the first coding result is as the amplitude of the output signal of first order amplifier 102 and exports to controller 101。
Reference picture 4 and Fig. 5, the below operation principle to the first level sensitive circuit 25 and the first digital encoder 28 Operation principle is illustrated.
In Fig. 4, the first level sensitive circuit 25 includes the first change-over circuit 41, and the first change-over circuit 41 can believe input The direct current signal of voltage stabilization number is converted into, so as to obtain the amplitude of input signal.In Fig. 4, when input signal is During sin1, by the first change-over circuit 41, the obtained corresponding DC levels of sin1 are V1；When input signal is sin2, warp The first change-over circuit 41 is crossed, the obtained corresponding DC levels of sin2 are V2；When input signal is sin3, by the first conversion Circuit 41, the obtained corresponding DC levels of sin3 are V3.
As can be known from Fig. 4, the amplitude of input signal is bigger, and corresponding DC level is bigger.
First digital encoder 28 includes two inputs, and first input end and the output end of first comparator 26 are coupled, The output end coupling of second input and the second comparator 27.First digital encoder 28 first comparator 26 is exported first Comparative result and the second comparative result of the second comparator 27 output are encoded, the first coding knot of one 2 bit of output Really.First of first coding result is the corresponding coding of the first comparative result, and the second of the first coding result is the second ratio Coding corresponding compared with result.
When the voltage of the first input end of first comparator 26 is more than the voltage of the second input, the first comparative result pair That answers is encoded to 0；When the voltage of the first input end of first comparator 26 is less than or equal to the voltage of the second input, first Comparative result is corresponding to be encoded to 1.When the voltage of the first input end of the second comparator 27 is more than the voltage of the second input, Second comparative result is corresponding to be encoded to 0；When the voltage of the first input end of the second comparator 27 is less than or equal to the second input During the voltage at end, the second comparative result is corresponding to be encoded to 1.
Reference picture 5, gives a kind of output waveform figure of first digital encoder 28 in the embodiment of the present invention.First ratio Voltage compared with the first input end of device 26 is less than or equal to the voltage of the second input, the first input end of the second comparator 27 Voltage is more than the voltage of the second input.
In Fig. 5, when the first digital encoder 28 receives RESET signal, exports coding result includes coding 1 and coding 2, wherein, coding 1 is the corresponding coding of the first comparative result, and coding 2 is the corresponding coding of the second comparative result.
Because the voltage of the first input end of first comparator 26 is less than or equal to the voltage of the second input, therefore coding 1 corresponding coding result is 1；Because the voltage of the first input end of the second comparator 27 is more than the voltage of the second input, because This 2 corresponding coding result of coding is 0.Therefore, the coding of the first digital encoder 28 is output as binary number 10.
Reference picture 6, gives a kind of structural representation of secondary signal intensity detection unit in the embodiment of the present invention, under Face is illustrated with reference to Fig. 1 and Fig. 2.
In specific implementation, secondary signal intensity detection unit 105 can include：Second current source 61, the 4th partial pressure electricity Hinder the 62, the 5th divider resistance 63, the 6th divider resistance 64, second electrical level detection circuit 65, the 3rd comparator 66, the 4th comparator 67 and second digital encoder 68.
The output end of second current source 61 is coupled with the first end of the 4th divider resistance 62.
Second end of the 4th divider resistance 62 is coupled with the first end of the 5th divider resistance 63；The of 5th divider resistance 63 Two ends and the first end of the 6th divider resistance 64 are coupled, and the second end and the ground of the 6th divider resistance 64 are coupled, namely：4th partial pressure Resistance 62, the 5th divider resistance 63 and the 6th divider resistance 64 are connected.
The input of second electrical level detection circuit 65 is coupled with the second low pass filter 108, and output end compares with the 3rd respectively The second input coupling of the second input, the 4th comparator 67 compared with device 66.Second electrical level detection circuit 65, which can be detected, to be obtained The amplitude of the output signal of the second level amplifier 103 for low-pass filtering treatment of learning from else's experience simultaneously is converted into the second DC level, and will Second DC level exports the second input, the second input of the 4th comparator 67 to the 3rd comparator 66 respectively.
The first input end of 3rd comparator 66 and the second end of the 4th divider resistance 62 are coupled, the second input and second The output end coupling of level sensitive circuit 65, output end and the input of the second digital encoder 68 are coupled.3rd comparator 66 The voltage at the two ends of the 4th divider resistance 62 and the second DC level are compared, the 3rd comparative result is obtained, and the 3rd is compared Relatively result is exported to the second digital encoder 68.
The first input end of 4th comparator 67 and the second end of the 5th divider resistance 63 are coupled, the second input and second The output end coupling of level sensitive circuit 65, output end and the input of the second digital encoder 68 are coupled.4th comparator 67 The voltage at the two ends of the 5th divider resistance 63 and the second DC level are compared, the 4th comparative result is obtained, and the 4th is compared Relatively result is exported to the second digital encoder 68.
Second digital encoder 68, the 3rd comparative result, the 4th comparator 67 suitable for receiving the output of the 3rd comparator 66 4th comparative result of output, and the 3rd comparative result and the 4th comparative result are encoded, obtain the second coding result.The Two digital encoders 68 are using the first coding result is as the amplitude of the output signal of second level amplifier 103 and exports to controller 101。
Reference picture 7 and Fig. 8, detect the operation principle and second digital encoder 68 of circuit 65 to second electrical level below Operation principle is illustrated.
In Fig. 7, second electrical level detection circuit 65 includes the second change-over circuit 71, and the second change-over circuit 71 can believe input The direct current signal of voltage stabilization number is converted into, so as to obtain the amplitude of input signal.In the figure 7, when input signal is During sin1, by the second change-over circuit 71, the obtained corresponding DC levels of sin1 are V1；When input signal is sin2, warp The second change-over circuit 71 is crossed, the obtained corresponding DC levels of sin2 are V2；When input signal is sin3, by the second conversion Circuit 71, the obtained corresponding DC levels of sin3 are V3.
As can be known from Fig. 7, the amplitude of input signal is bigger, and corresponding DC level is bigger.
Second digital encoder 68 includes two inputs, the output end coupling of first input end and the 3rd comparator 66, The output end coupling of second input and the 4th comparator 67.The 3rd of second 68 pair the 3rd of digital encoder comparator 66 output Comparative result and the 4th comparative result of the 4th comparator 67 output are encoded, the second coding knot of one 2 bit of output Really.First of second coding result is the corresponding coding of the 3rd comparative result, and the second of the second coding result is the 4th ratio Coding corresponding compared with result.When the voltage of the first input end of the 3rd comparator 66 is more than the voltage of the second input, the 3rd Comparative result is corresponding to be encoded to 0；When the voltage of the first input end of the 3rd comparator 66 is less than or equal to the second input During voltage, the 3rd comparative result is corresponding to be encoded to 1.
When the voltage of the first input end of the 4th comparator 67 is more than the voltage of the second input, the 4th comparative result pair That answers is encoded to 0；When the voltage of the first input end of the 4th comparator 67 is less than or equal to the voltage of the second input, the 4th Comparative result is corresponding to be encoded to 1.
Reference picture 8, gives a kind of output waveform figure of second digital encoder 68 in the embodiment of the present invention.3rd ratio Voltage compared with the first input end of device 66 is less than or equal to the voltage of the second input, the first input end of the 4th comparator 67 Voltage is more than the voltage of the second input.
In Fig. 8, when the second digital encoder 68 receives RESET signal, exports coding result includes coding 3 and coding 4, wherein, coding 3 is the corresponding coding of the 3rd comparative result, and coding 4 is the corresponding coding of the 4th comparative result.
Because the voltage of the first input end of the 3rd comparator 66 is less than or equal to the voltage of the second input, therefore coding 3 corresponding coding results are 1；Because the voltage of the first input end of the 4th comparator 67 is more than the voltage of the second input, because This 4 corresponding coding result of coding is 0.Therefore, the coding of the second digital encoder 68 is output as binary number 10.
The embodiment of the present invention additionally provides a kind of control method of automatic gain control circuit, reference picture 9, below in conjunction with figure 1~8 and specific steps be described in detail.
In specific implementation, automatic gain control circuit can include first order amplifier and second level amplifier.When When automatic gain control circuit works, first the output gain of first order amplifier can be adjusted.
Step S901, obtains the amplitude of the first order amplifier output signal.
In specific implementation, the pending signal that receiver receiver/transmitter is sent.After pending signal is received, First treat process signal and be amplified processing.
In embodiments of the present invention, after pending signal is received, first order amplifier is first passed through to pending letter Number it is amplified processing.Controller can obtain the amplitude of first order amplifier output signal.In the output of first order amplifier Between end and the input of second level amplifier, the first low pass filter is provided with.First low pass filter can be to the first order The output signal of amplifier carries out low-pass filtering treatment.
In specific implementation, the first signal strength detection list can be set between the first low pass filter and controller Member, the width of the first order amplifier output signal after low-pass filtering treatment is detected by the first signal strength detection unit Degree, the amplitude of the first order amplifier output signal detected is exported to controller.
It is understood that the amplitude of first order amplifier output signal can also be obtained using other devices, this Place is not repeated.
Step S902, according to the amplitude of the first order amplifier output signal after low-pass filtering treatment and in advance If the corresponding target voltage amplitude of pending signal, control the amplitude of the first order amplifier output signal to be in the first mesh Mark in amplitude range.
In specific implementation, controller can be previously according to the corresponding target voltage amplitude of pending signal, to set The first object amplitude range of first stage amplifier output signal.In first object amplitude range, first order amplifier is in line Property amplification working region.
In specific implementation, controller can precompute according to the corresponding target voltage amplitude of pending signal The corresponding target gain of first stage amplifier and the corresponding target gain of second level amplifier, and then obtain first order amplifier pair The target amplitude corresponding to target gain answered, and the target amplitude corresponding to the corresponding target gain of second level amplifier.
Controller is after the amplitude of the first order amplifier output signal after low-pass filtering treatment is got, you can By the amplitude of the first order amplifier output signal after low-pass filtering treatment target amplitude corresponding with first order amplifier It is compared.When the amplitude of the first order amplifier output signal after low-pass filtering treatment is less than first order amplifier correspondence Target amplitude when, controller can generate the first control signal and export to first order amplifier control end, first control The corresponding output gain of signal becomes big.First order amplifier is after the first control signal is received, you can increase output gain.When The amplitude of first order amplifier output signal after low-pass filtering treatment is more than the corresponding target amplitude of first order amplifier When, controller can generate the first control signal and export to the control end of first order amplifier, and the first control signal is corresponding Output gain diminishes.First order amplifier is after the first control signal is received, you can reduction output gain.
For example, the output gain of first order amplifier is 6dB, the amplitude quantizing of the output signal of first order amplifier is two System number 000, the quantized value of the corresponding target amplitude of first order amplifier is binary number 010, therefore, it can judge the first order The output gain of amplifier is less than the target gain of first order amplifier.Controller generates the first control signal, the first control letter The information carried in number is binary number 010.First order controller is received after the first control signal, by output gain from 6dB It is adjusted to 12dB.
And for example, the output gain of first order amplifier is 15dB, and the amplitude quantizing of the output signal of first order amplifier is Binary number 010, the quantized value of the corresponding target amplitude of first order amplifier is 001.Controller generates the first control signal, the The information carried in one control signal is binary number 010.First order controller is received after the first control signal, and output is increased Benefit is adjusted to 12dB from 15dB.
Step S903, obtains the amplitude of the second level amplifier output signal.
In specific implementation, second level amplification by the pending signal after first order amplifier enhanced processing to carrying out Secondary enhanced processing, and the result that secondary enhanced processing is obtained exported to controller.In the second level output end of amplifier with Between controller, the second low pass filter is provided with.Second low pass filter can enter to the output signal of second level amplifier Row low-pass filtering treatment.
In specific implementation, secondary signal intensity detection list can be set between the second low pass filter and controller Member, the width of the second level amplifier output signal after low-pass filtering treatment is detected by secondary signal intensity detection unit Degree, the amplitude of the second level amplifier output signal detected is exported to controller.
It is understood that the amplitude of second level amplifier output signal can also be gathered using other devices, this Place is not repeated.
Step S904, according to the amplitude of the second level amplifier output signal after low-pass filtering treatment and in advance If the corresponding target voltage amplitude of the pending signal, control the amplitude of the second level amplifier output signal to be in the In the range of two target amplitudes.
In specific implementation, controller can be previously according to the corresponding target voltage amplitude of pending signal, to set Second target amplitude scope of two-stage amplifier output signal.In the range of the second target amplitude, second level amplifier is in line Property amplification working region.
Controller is after the amplitude of the second level amplifier output signal after low-pass filtering treatment is got, you can By the amplitude of the second level amplifier output signal after low-pass filtering treatment target amplitude corresponding with second level amplifier It is compared.When the amplitude of the second level amplifier output signal after low-pass filtering treatment is less than second level amplifier correspondence Target amplitude when, controller can generate the second control signal and export to second level amplifier control end, second control The corresponding output gain of signal becomes big.Second level amplifier is after the second control signal is received, you can increase output gain.When The amplitude of second level amplifier output signal after low-pass filtering treatment is more than the corresponding target amplitude of second level amplifier When, controller can generate the second control signal and export to the control end of second level amplifier, and the second control signal is corresponding Output gain diminishes.Second level amplifier is after the second control signal is received, you can reduction output gain.
In specific implementation, controller can obtain the output of the first order amplifier after low-pass filtering treatment in real time The amplitude of the amplitude of signal and the output signal of the second level amplifier after low-pass filtering treatment, with real time to the first order The gain of the output gain and second level amplifier of amplifier is adjusted so that first order amplifier and second level amplifier While the signal to input is amplified to meet target voltage amplitude, the non-linear distortion of step-down amplifier occurs generally Rate, improves receiver circuit reliability.
In specific implementation, controller is controlling the increasing of first order amplifier according to the target voltage amplitude of pending signal During the gain of benefit and second level amplifier, it is possible that following situation：Controller controls the gain of first order amplifier to be It is the maximum gain that the gain of second level amplifier configuration is more than the linear operating region of second level amplifier after some value Value, or the gain configured for second level amplifier are less than the minimum gain value of the linear operating region of second level amplifier.
When there is above-mentioned situation, second level amplifier can not be operated in linear operating region, cause receiver reliability It is poor.
In specific implementation, linear operating region is not in for the gain of second level amplifier configuration when controller detects When interior, controller can configure gain for first order amplifier again.Controller is being that first order amplifier configures gain again Afterwards, gain is configured for second level amplifier again, to cause the gain of the second level amplifier reconfigured to be put in the second level The big corresponding linear operating region of device.
Specifically, it is more than the linear of second level amplifier when controller detects for the gain of second level amplifier configuration During the maxgain value of working region, controller configures gain for first order amplifier again, amplifies before increase for the first order The gain that device is configured.Again it is being after first order amplifier configures gain, because the gain of first order amplifier increases, therefore Controller is the gain reduction that second level amplifier is reconfigured, therefore can be by the Gain tuning configured for second level amplifier extremely The linear operating region of second level amplifier.
When controller detects linear operating region of the gain configured for second level amplifier less than second level amplifier Minimum gain value when, controller again for first order amplifier configure gain, configured before reduction by first order amplifier Gain.After being again the configuration gain of first order amplifier, due to the gain reduction of first order amplifier, therefore controller is The gain increase that second level amplifier is reconfigured, therefore the Gain tuning that can configure second level amplifier to the second level is amplified The linear operating region of device.
The workflow of the automatic gain control circuit to being provided in the embodiment of the present invention is illustrated below.Reference picture 10, give a kind of workflow diagram of automatic gain control circuit in the embodiment of the present invention.
Step S1001, when detecting pending signal input, controller is respectively first order amplifier and the second level Amplifier configures initial gain.
In specific implementation, controller can be according to the corresponding target voltage amplitude of pending signal, the respectively first order Amplifier and second level amplifier configuration initial gain.Controller is the initial gain of first order amplifier configuration with being the second level The initial gain of amplifier configuration be able to can not also be waited with equal.
Step S1002, first order amplifier treats process signal and carries out first order enhanced processing.
Step S1003, the first low pass filter carries out low-pass filtering treatment to the pending signal amplified by the first order.
Step S1004, the first signal strength detection unit detects the amplitude of the output signal of the first low pass filter.
In specific implementation, the output signal of the first low pass filter is：By the first low pass filter filtering process it The output signal of first order amplifier afterwards.
Step S1005, controller judges whether the amplitude of the output signal of the first low pass filter is in first object width In the range of degree.
In specific implementation, when the amplitude of the output signal of the first low pass filter is in first object amplitude range When, perform step S1006；When the amplitude of the output signal of first order low pass filter is in outside first object amplitude range, Perform step S1007.
Step S1006, controller determines the gain of first order amplifier.
In specific implementation, when the amplitude of the output signal of the first low pass filter is in first object amplitude range When, it is possible to determine that first order amplifier operation is in linear magnification region.
Step S1007, controller adjusts the gain of first order amplifier.
In specific implementation, when the amplitude of the output signal of the first low pass filter is more than in first object amplitude range During maximum, controller can reduce the gain of first order amplifier；When the amplitude of the output signal of the first low pass filter is small During minimum value in first object amplitude range, controller can increase the gain of first order amplifier.
After step S1007 is completed, step S1002 is re-executed.
Step S1008, second level amplifier carries out second level enhanced processing to the output signal of the first low pass filter.
Step S1009, the second low pass filter carries out low-pass filtering treatment to the signal amplified by the second level.
Step S1010, secondary signal intensity detection unit detects the amplitude of the output signal of the second low pass filter.
In specific implementation, the output signal of the second low pass filter is：By the second low pass filter filtering process it The output signal of second level amplifier afterwards.
Step S1011, controller judges whether the amplitude of the output signal of the second low pass filter is in the second target width In the range of degree.
In specific implementation, when the amplitude of the output signal of the second low pass filter is in the range of the second target amplitude When, perform step S1012；When the amplitude of the output signal of second level low pass filter is in outside the second target amplitude scope, Perform step S1013.
Step S1012, controller determines the gain of second level amplifier.
In specific implementation, when the amplitude of the output signal of the second low pass filter is in the range of the second target amplitude When, it is possible to determine that second level amplifier operation is in linear magnification region.
Step S1013, controller judges whether the gain of second level amplifier is in Linear Amplifer region.
When the gain of second level amplifier is in Linear Amplifer region, step S1014 is performed；When second level amplifier When gain is not in Linear Amplifer region, step S1015 is performed.
Step S1014, controller adjusts the gain of second level amplifier.
In specific implementation, when the amplitude of the output signal of the second low pass filter is more than in the second target amplitude scope During maximum, controller can reduce the gain of second level amplifier；When the amplitude of the output signal of the second low pass filter is small During minimum value in the second target amplitude scope, controller can increase the gain of second level amplifier.
Step S1015, gain of the controller to first order amplifier is adjusted.
In specific implementation, when the gain of second level amplifier is more than the maximum in Linear Amplifer region, controller increases Plus the gain of first order amplifier；When the gain of second level amplifier is less than the minimum value in Linear Amplifer region, controller drop The gain of low first order amplifier.
After the completion of step S1015 execution, step S1002 is re-executed.
The embodiment of the present invention additionally provides a kind of receiver, and the receiver includes what is provided in the above embodiment of the present invention Automatic gain control circuit.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can Completed with indicating the hardware of correlation by program, the program can be stored in a computer-readable recording medium, storage Medium can include：ROM, RAM, disk or CD etc..
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art, are not departing from this In the spirit and scope of invention, it can make various changes or modifications, therefore protection scope of the present invention should be with claim institute The scope of restriction is defined.

Claims (10)

1. a kind of automatic gain control circuit, it is characterised in that including：Controller, first order amplifier, the first LPF Device, second level amplifier, the second low pass filter, analog-digital commutator, the first signal strength detection unit and secondary signal Intensity detection unit, wherein：
The first order amplifier, input inputs pending signal, output end and first low pass filter coupled, is suitable to The pending signal is amplified and handles and exports；
First low pass filter, is coupled in the output end of the first order amplifier and the input of the second level amplifier Between end, low-pass filtering treatment is carried out suitable for the output signal to the first order amplifier；
The second level amplifier, output end and second low pass filter coupled, suitable for by first order amplification The pending signal of device enhanced processing carries out secondary amplification and exported；
Second low pass filter, is coupled in the output end of the second level amplifier and the input of the analog-digital commutator Between end, low-pass filtering treatment is carried out suitable for the output signal to the second level amplifier；
The analog-digital commutator, output end and the controller are coupled, suitable for by described second Jing Guo low-pass filtering treatment The output signal of level amplifier is converted into digital signals format and exported to the controller；
The first signal strength detection unit, is coupled between first low pass filter and the controller, suitable for inspection Survey the amplitude of the output signal of the first order amplifier Jing Guo low-pass filtering treatment and export to the controller；
The secondary signal intensity detection unit, is coupled between second low pass filter and the controller, suitable for inspection Survey the amplitude of the output signal of the second level amplifier Jing Guo low-pass filtering treatment and export to the controller；
The controller, control end respectively with the first order amplifier, the control end of the second level amplifier, described One signal strength detection unit and secondary signal intensity detection unit coupling, suitable for defeated according to the first order amplifier Go out the amplitude of signal, the amplitude of the second level amplifier output signal and the corresponding target of the default pending signal Voltage amplitude, generates the first control signal, the second control signal, and exports first control signal to the first order and amplify The control end of device, exports second control signal to the control end of the second level amplifier, the first order is controlled respectively The gain of amplifier and the second level amplifier so that the amplitude of the output signal of the first order amplifier is in the first mesh Mark in amplitude range, the amplitude of the output signal of the second level amplifier is in the range of the second target amplitude, and described The first order amplifier is in the corresponding Linear Amplifer working region of the first order amplifier in first object amplitude range, The second level amplifier is in the corresponding Linear Amplifer work of the second level amplifier in the range of second target amplitude Make region.
2. automatic gain control circuit as claimed in claim 1, it is characterised in that the analog-digital commutator is analog-to-digital conversion Device.
3. automatic gain control circuit as claimed in claim 1, it is characterised in that also include：With first LPF First calibration circuit of device coupling, suitable for carrying out frequency compensation to first low pass filter.
4. automatic gain control circuit as claimed in claim 1, it is characterised in that also include：With second LPF Second calibration circuit of device coupling, suitable for carrying out frequency compensation to second low pass filter.
5. automatic gain control circuit as claimed in claim 1, it is characterised in that the first order amplifier is differential electricity Road.
6. automatic gain control circuit as claimed in claim 1, it is characterised in that the second level amplifier is differential electricity Road.
7. automatic gain control circuit as claimed in claim 1, it is characterised in that the first signal strength detection unit, Including：First current source, the first divider resistance, the second divider resistance, the 3rd divider resistance, the first level sensitive circuit, first Comparator, the second comparator and the first digital encoder, wherein：
First current source, output end and the first end of first divider resistance are coupled；
First divider resistance, the first end of the second end and second divider resistance and the first of the first comparator defeated Enter end coupling；
Second divider resistance, the first end of the second end and the 3rd divider resistance and the first of second comparator defeated Enter end coupling；
3rd divider resistance, the second end is coupled with ground；
First level sensitive circuit, input and first low pass filter coupled, output end is respectively with described first The second input coupling of second input of comparator and second comparator, is adapted to detect for obtaining by LPF The amplitude of the output signal of the first order amplifier of reason is simultaneously converted into the first DC level, and by first DC level Export respectively to the second input of the second input of the first comparator, second comparator；
The first comparator, the second end of first input end and first divider resistance is coupled, the second input with it is described The output end coupling of first level sensitive circuit, the input of output end and first digital encoder is coupled, suitable for by institute The voltage and first DC level for stating the first divider resistance two ends are compared, and export the first comparative result to described the One digital encoder；
Second comparator, the second end of first input end and second divider resistance is coupled, the second input with it is described The output end coupling of first level sensitive circuit, the input of output end and first digital encoder is coupled, suitable for by institute The voltage and first DC level for stating the second divider resistance two ends are compared, and export the second comparative result to described the One digital encoder；
First digital encoder, suitable for being encoded to first comparative result and second comparative result, and Using the first obtained coding result is as the amplitude of the first order amplifier output signal and exports to the controller.
8. automatic gain control circuit as claimed in claim 1, it is characterised in that the secondary signal intensity detection unit, Including：Second current source, the 4th divider resistance, the 5th divider resistance, the 6th divider resistance, second electrical level detection circuit, the 3rd Comparator, the 4th comparator and the second digital encoder, wherein：
Second current source, output end and the first end of the 4th divider resistance are coupled；
4th divider resistance, the first end of the second end and the 5th divider resistance and the first of the 3rd comparator defeated Enter end coupling；
5th divider resistance, the first end of the second end and the 6th divider resistance and the first of the 4th comparator defeated Enter end coupling；
6th divider resistance, the second end is coupled with ground；
The second electrical level detects circuit, input and second low pass filter coupled, and output end is respectively with the described 3rd The second input coupling of second input of comparator and the 4th comparator, is adapted to detect for obtaining by LPF The amplitude of the output signal of the second level amplifier of reason is simultaneously converted into the second DC level, and by second DC level The second input to the second input of the 3rd comparator and the 4th comparator is exported respectively；
3rd comparator, the second end of first input end and the 4th divider resistance is coupled, the second input with it is described The output end coupling of second electrical level detection circuit, the input of output end and second digital encoder is coupled, suitable for by institute The voltage and second DC level for stating the 4th divider resistance two ends are compared, and export the 3rd comparative result to described the Two digital encoders；
4th comparator, the second end of first input end and the 5th divider resistance is coupled, the second input with it is described The output end coupling of second electrical level detection circuit, the input of output end and second digital encoder is coupled, suitable for by institute The voltage and second DC level for stating the 5th divider resistance two ends are compared, and export the 4th comparative result to described the Two digital encoders；
Second digital encoder, suitable for being encoded to the 3rd comparative result and the 4th comparative result, and Using the second obtained coding result is as the amplitude of the second level amplifier output signal and exports to the controller.
9. a kind of receiver, it is characterised in that including：Automatic gain control circuit as described in any one of claim 1~8.
10. a kind of control method of automatic gain control circuit, it is characterised in that the automatic gain control circuit includes：According to The first order amplifier and second level amplifier of secondary coupling, the control method include：
Obtain the amplitude of the first order amplifier output signal；
According to the amplitude of the first order amplifier output signal after low-pass filtering treatment and default pending letter Number corresponding target voltage amplitude, controls the amplitude of the first order amplifier output signal to be in first object amplitude range It is interior；
Obtain the amplitude of the second level amplifier output signal；
According to the amplitude of the second level amplifier output signal after low-pass filtering treatment and it is default described in wait to locate The corresponding target voltage amplitude of signal is managed, controls the amplitude of the second level amplifier output signal to be in the second target amplitude model In enclosing；
The first order amplifier is in that the first order amplifier is corresponding linearly puts in the first object amplitude range Big working region, the second level amplifier is corresponding linear in the second level amplifier in second target amplitude Amplify working region.
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