CN104734653A - Receiving device and control method of amplifying coefficients thereof - Google Patents
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Abstract
The invention relates to a receiving device and a control method of amplifying coefficients thereof. The method includes the steps that a first variable of the equivalent length of a cable is detected, a second variable of the amplifying coefficient of an automatic digital gain controller is detected, a first updating value of the amplifying coefficient of an automatic simulation gain controller is determined according to the first variable and the second variable, the tuning ratio between the first updating value and the current value of the amplifying coefficient of the automatic simulation gain controller is computed, a second updating value of the amplifying coefficient of the automatic digital gain controller is computed according to the tuning ratio, the set value of the amplifying coefficient of the automatic simulation gain controller is updated according to the first updating value, and the set value of the amplifying coefficient of the automatic digital gain controller is updated according to the second updating value.
Description
Technical field
The present invention relates to a kind of parameter tunable technology of communications network system, be specifically related to the control method of a kind of receiving system and amplification coefficient thereof, it is applicable in communications network system.
Background technology
In the receiver, programmable gain amplifier device (programmable gain amplifier; PGA) namely gain no longer changes after determining in start-up routine.But the change of environment can cause the variation of relevant parameter, and then cause analog to digital converter (analog-to-digital converter; ADC) output signal generation slicing (clipping) phenomenon.
For example, in Ethernet (Ethernet) system, same cable (cable), under the different temperatures of-40 DEG C to 125 DEG C, changes to more than 100 meters to the large appointment of insertion loss (insertion loss) conversion equivalent length of signal measured by it from 10 meters.When the impact of ambient temperature on cable causes insertion loss to change violent, papr (the peak-to-averagepower ratio of signal; PAPR) also can change thereupon, thus cause clipping phenomena to occur.
Summary of the invention
In one embodiment, a kind of control method of amplification coefficient of receiving system, comprise: the first variable detecting the equivalent length of a cable, detect the second variable of the amplification coefficient of a digital resources obtainment device, the first updated value of the amplification coefficient of a simulation automatic gain controller is determined according to the first variable and the second variable, calculate the first updated value and simulation automatic gain controller amplification coefficient currency between tuning ratio, the second updated value of the amplification coefficient of digital resources obtainment device is calculated according to tuning ratio, the set point of the amplification coefficient of simulation automatic gain controller is upgraded according to the first updated value, and foundation second updated value upgrades the set point of the amplification coefficient of digital resources obtainment device.
In one embodiment, a kind of receiving system comprises a front end receive circuit, a feed forward equalizer, an add circuit, a digital resources obtainment device, a feedback equalizer, a channel estimation device and a control unit.
Front end receive circuit has a simulation automatic gain controller.Feed forward equalizer electrical connection front end receive circuit.Add circuit electrical connection feed forward equalizer.Digital resources obtainment device is connected electrically between feed forward equalizer and add circuit.Feedback equalizer electrical connection add circuit.Channel estimation device is in order to estimate the equivalent length of a cable.Control unit electrical connection simulation automatic gain controller, digital resources obtainment device and channel estimation device, and in order to determine one first updated value of the amplification coefficient of simulating automatic gain controller according to the variable of the variable of equivalent length and the amplification coefficient of digital resources obtainment device, according to one second updated value of the amplification coefficient of the tuning ratio determination digital resources obtainment device between the currency of the amplification coefficient of the first updated value and simulation automatic gain controller and the set point upgrading multiple amplification coefficients of simulating automatic gain controller and digital resources obtainment device according to the first updated value and the second updated value respectively.
To sum up, control method according to receiving system of the present invention and amplification coefficient thereof is applied in communications network system, it can the change of monitoring environment temperature the amplification coefficient of the tuning automatic gain controller of adaptability, thus the convergence of accelerating system promote signal quality, and then avoid system break online (linkdown) and elevator system performance.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of receiving system according to an embodiment of the present invention.
Fig. 2 is the schematic diagram of an execution mode of front end receive circuit in Fig. 1.
Fig. 3 to Fig. 5 is the flow chart of the control method of the amplification coefficient of receiving system according to an embodiment of the present invention.
Symbol description
10 receiving systems
110 front end receive circuit
111 noise elimination apparatus
112 simulation automatic gain controllers
113 low pass filters
114 samplings/holding circuit
115 anti-phase partial-response filtering devices
116 analog to digital converters
120 noise elimination apparatus
130 feed forward equalizers
140 digital resources obtainment devices
150 add circuits
160 feedback equalizers
170 time sequence restorers
180 decision feedback sequence estimators
190 decision data devices
200 channel estimation devices
210 control units
220 memory cell
230 timers
L equivalent length
G1 amplification coefficient
S30 performs monitoring temperature program
S310 estimates the equivalent length of a cable
S330 reads the amplification coefficient of digital resources obtainment device
S350 calculates the first variable according to the currency of equivalent length and preceding value
S370 calculates the second variable according to the currency of the amplification coefficient of digital resources obtainment device and preceding value
S390 compares the first variable with first threshold and compare the second variable and Second Threshold
S40 starts tuner program
S410 calculates target average power according to equivalent length
The average output power of S430 calculating simulation automatic gain controller
S450 compares average output power and target average power
S470 tune direction is for increasing
S472 tune direction is for reducing
Whether S480 tune direction is contrary
S490 increases the amplification coefficient of simulation automatic gain controller to obtain the first updated value
S492 reduces the amplification coefficient of simulation automatic gain controller to obtain the first updated value
Whether S510 first updated value drops in critical value
S530 calculates the tuning ratio between the currency of the amplification coefficient of the first updated value and simulation automatic gain controller
S550 calculates the second updated value of the amplification coefficient of digital resources obtainment device according to tuning ratio
S570 upgrades the set point of the amplification coefficient of simulation automatic gain controller according to the first updated value
S580 waits for a very first time
S590 upgrades the set point of the amplification coefficient of digital resources obtainment device according to the second updated value
S610 records tune direction
S630 waited for for one second time
S70 removes the record of tune direction
S80 starts timing
Embodiment
Fig. 1 is the schematic diagram of receiving system according to an embodiment of the present invention.This receiving system 10 can be applicable in communications network system.At this, communications network system can such as ether (Ethernet) network system, but is not limited thereto.
With reference to Fig. 1, receiving system 10 comprises front end receive circuit 110, noise elimination apparatus 120, feed forward equalizer (feed-forward equalizer; FFE) 130, one digital resources obtainment device (digital automatic gain controller; DAGC) 140, one add circuit 150, feedback equalizer (feedback equalizer; FBE) 160, one time sequence restorer 170, decision feedback sequence estimator (decision-feedback sequence estimation; DFSE) 180, one decision data device (slicer) 190, channel estimation device 200 and a control unit 210.
Front end receive circuit 110, noise elimination apparatus 120, feed forward equalizer 130, digital resources obtainment device 140, add circuit 150 and decision feedback sequence estimator 180 are electrically connected (series connection) successively.In other words, noise elimination apparatus 120 is connected electrically between front end receive circuit 110 and feed forward equalizer 130, and digital resources obtainment device 140 is connected electrically between feed forward equalizer 130 and add circuit 150.
Feedback equalizer 160 is electrically connected to add circuit 150, and time sequence restorer 170 is connected electrically between front end receive circuit 110 and feedback equalizer 160.At this, two inputs of add circuit 150 are electrically connected feed forward equalizer 130 and feedback equalizer 160 respectively, and the output of add circuit 150 electrical connection decision feedback sequence estimator 180.Wherein, decision data device 190 is connected electrically between the output of add circuit 150 and feedback equalizer 160.
Control unit 210 is electrically connected to front end receive circuit 110, digital resources obtainment device 140 and channel estimation device 200.
Front end receive circuit 110 is in order to receive the input signal of teletransmission and to convert thereof into digital signal.Noise elimination apparatus 120 is in order to eliminate the near-end interference in signal.Feed forward equalizer 130 is in order to front vernier (precursor) composition of intersymbol interference in erasure signal (inter-symbol interference, ISI).Add circuit 150 is in order to eliminate the long-range interference in signal according to the digital input signals of the eliminating through near-end interference of other near-end receivers, time sequence reply and channel equalization.Feedback equalizer 160 is in order to eliminate rear vernier (postcursor) composition of intersymbol interference.Time sequence restorer 170 in order to the reply of executive signal sequential, with the frequency of the frequency signal of the frequency and phase place and transmission ends that make the frequency signal of receiving terminal and Phase synchronization.Decision feedback sequence estimator 180 is in order to carry out decoding and the rear vernier composition of intersymbol interference in erasure signal.Channel estimation device 200 be to master/slave transceiver between channel length (namely, be coupled in the equivalent length L of the cable between master/slave R-T unit) estimate, to preset and to upgrade every component parameter, thus the convergence of accelerating system promote signal quality.
Substantially, the structure of front end receive circuit 110 be operating as known in the art, for example, with reference to Fig. 2, in multiple execution mode, front end receive circuit 110 can comprise: a noise elimination apparatus 111, simulates automatic gain controller (analog automatic gain controller; AAGC) 112, one low pass filter (low pass filter, LPF) 113, one sampling/holding circuit (S/H circuit) 114, anti-phase partial-response filtering device (inverse partial response, IPR) 115 and an analog to digital converter (analog-to-digital converter, ADC) 116.
Noise elimination apparatus 111, simulation automatic gain controller 112, low pass filter 113, sampling/holding circuit 114, anti-phase partial-response filtering device 115 are electrically connected (series connection) successively with analog-to-digital converter 116 and noise elimination apparatus 120.Time sequence restorer 170 is connected electrically between analog-to-digital converter 116 and feedback equalizer 160.
After input signal is received by noise elimination apparatus 111, export to noise elimination apparatus 120 via noise elimination apparatus 111, simulation automatic gain controller 112, low pass filter 113, sampling/holding circuit 114, anti-phase partial-response filtering device 115 after processing with analog-to-digital converter 116 successively.
Substantially, the structure of noise elimination apparatus 120 be operating as known in the art, for example, in multiple execution mode, noise elimination apparatus 120 can comprise an Echo Canceller (echocanceller), multiple near-end crosstalk arrester (near-end crosstalk canceller, NEXTcanceller) and an adder.Echo Canceller and near-end crosstalk arrester are electrically connected to another input of adder.The output of adder is then electrically connected to feed forward equalizer 130.
Substantially, the method of the estimation equivalent length L of channel estimator 200 is known in the art, for example, evaluation method can be such as utilize Received signal strength to estimate at the slope (slope) of transitional period (transition period), utilize measure Received signal strength energy (measure received signalenergy) estimate, by Israel Greiss institute propose to utilize the channel response of 6MHz and 43MHz to estimate, based on Israel Greiss theory employing simplification discrete Fourier transform (DFT) (discretefourier transform; DFT) estimate (such as: China TWI2205611 patent) or utilize the channel samples of feed forward equalizer 130 and feedback equalizer 160 to estimate (such as: China's No. 102129205 patent application case) etc., but at this not to its restriction.
In multiple execution mode, digital resources obtainment device 140 and simulation automatic gain controller 112 can respectively by programmable gain amplifier (programmable gain amplifier; PGA) realize.
Generally speaking, in the start-up routine of receiving system 10, control unit 210 can preset the component parameter of each assembly.In the present case, in the operating process (after completing start-up routine) of receiving system 10, control unit 210 is also according to the amplification coefficient of the tuning automatic gain controller of variation of ambient temperature.
With reference to Fig. 3, control unit 210 performs monitoring temperature program (step S30), carrys out the change of testing environment temperature with the variable (hereinafter referred to as the second variable) by detecting the variable (hereinafter referred to as the first variable) of equivalent length L and the amplification coefficient G1 of digital resources obtainment device 140.
At this, control unit 210 control channel estimator 200 estimates that the equivalent length L of a cable to obtain the equivalent length L(estimated is, currency) (step S310), and the amplification coefficient G1(of reading digital resources obtainment device 140 is namely, currency) (step S330).
Then, control unit 210 according to the currency of the equivalent length L obtained and the front preceding value once obtained (namely, before the equivalent length L that once estimates) calculate the first variable, that is, calculate the difference (step S350) between the currency of equivalent length L and preceding value.
And, control unit 210 according to the currency of the amplification coefficient G1 obtained and the front preceding value once obtained (namely, before the amplification coefficient G1 that once reads) calculate the second variable, that is, calculate the difference (step S370) between the currency of amplification coefficient G1 and preceding value.
Wherein, control unit 210 can be electrically connected a memory cell 220.When the currency of the equivalent length L obtained and amplification coefficient G1 at every turn, control unit 210 can be stored in memory cell 220 by the currency of the equivalent length L obtained and amplification coefficient G1, using as next time in order to calculate the preceding value of variable.
Control unit 210 compares the first variable again with first threshold and compare the second variable and Second Threshold, to judge ambient temperature whether acute variation (step S390).Wherein, first threshold and Second Threshold are the set value preset.Such as: to be stored in the memory cell 220 of receiving system 10 with firmware or software set when receiving system 10 dispatches from the factory.
When the first variable be greater than first threshold or the second variable be greater than Second Threshold or both be all greater than each self-corresponding threshold value time, control unit 210 judges ambient temperature acute variation and starts tuner program (tuning program) (step S40).
When the first variable is not more than first threshold and the second variable is not more than Second Threshold (that is, both are neither greater than each self-corresponding threshold value), control unit 210 judges the non-acute variation of ambient temperature.
With reference to Fig. 4 and Fig. 5, when judging ambient temperature acute variation, control unit 210 performs tuner program S40, to reset the amplification coefficient of automatic gain controller.
At this, control unit 210 calculates a target average power (step S410) according to the currency of equivalent length L.
Further, the average output power (step S430) of control unit 210 calculating simulation automatic gain controller 212.
Then, control unit 210 compares the tune direction (increase or reduce) (step S450) that average output power and target average power judge to simulate the amplification coefficient G2 of automatic gain controller 212.
When average output power is less than target average power, control unit 210 judges that tune direction is as increase amplification coefficient (being denoted as G2 below) (step S470), and foundation tune direction increases the gear of the amplification coefficient G2 of simulation automatic gain controller 212 to obtain the updated value (hereinafter referred to as the first updated value) (step S490) of the amplification coefficient G2 simulating automatic gain controller 212.
When average output power is not less than target average power, control unit 210 judges that tune direction is as minimizing amplification coefficient G2(step S472), and simulate the gear of the amplification coefficient G2 of automatic gain controller 212 to obtain the first updated value (step S492) according to tune direction minimizing.
Then, control unit 210 compares critical value (that is, maxima and minima) (the step S510) of the first updated value and the amplification coefficient G2 obtained.Wherein, critical value is the set value preset.Such as: to be stored in the memory cell 220 of receiving system 10 with firmware or software set when receiving system 10 dispatches from the factory.
When the first updated value drops on (that is, between maxima and minima) in critical value, the tuning ratio (step S530) between the currency of the amplification coefficient G2 of the first updated value that control unit 210 calculates and simulation automatic gain controller 212.For example, suppose currency be gear 3(namely, by signal amplify 0.2) and the first updated value be gear 4(namely, by signal amplify 0.3), then tuning ratio is then 1.5(=0.3/0.2).
Control unit 210 calculates the updated value (hereinafter referred to as the second updated value) (step S550) of the amplification coefficient G1 of digital resources obtainment device 140 according to tuning ratio.For example, suppose that tuning ratio is 1.5, currency/1.5 of the second updated value=amplification coefficient G1.
Control unit 210 upgrades the set point (step S570) of the amplification coefficient G2 of simulation automatic gain controller 212 according to the first updated value.In other words, the first updated value substitutes in simulation automatic gain controller 212 using the set point as amplification coefficient G2 by control unit 210.
Then, control unit 210 upgrades the set point (step S590) of the amplification coefficient G1 of digital resources obtainment device 140 according to the second updated value.In other words, the second updated value substitutes in digital resources obtainment device 140 using the set point as amplification coefficient G1 by control unit 210.
At this, control unit 210 after execution step S570, first can be waited for a given time (hereinafter referred to as the very first time) (step S580), then just performs step S590, to guarantee the continuous of data.In other words, upgrade when the amplification coefficient G2 of simulation automatic gain controller 212 is different from the amplification coefficient G1 of digital resources obtainment device 140, but between both update times, there is the delay of a very first time.
Wherein, the very first time is corresponding to the component count be connected between simulation automatic gain controller and digital resources obtainment device.In other words, the very first time is for same group of data is from the time outputted to by simulation automatic gain controller needed for digital resources obtainment device exports.
At this, control unit 210 can record this tune direction (such as: be stored in memory cell 220) (step S610).
Further, control unit 210 waits for that a given time (hereinafter referred to as the second time) (step S630) is with after making system convergence, re-executes tuner program S40.At this, in step S410, control unit 210 can calculate target average power (such as: be stored in memory cell 220) by recording gauge, and when re-executing, then without the need to again calculating.In other words, after system convergence, control unit 210 is back to step S430, to re-execute step S430 to step S630.
At this, whether control unit 210 changes by detection tune direction determines whether to terminate tuner program (step S40).In other words, after obtaining tune direction (step S470 or step S472), control unit 210 first compares the tune direction of tune direction and the previous record obtained to determine whether tune direction changes (step S480).
When tune direction does not change, control unit 210 just continues to perform step S490 or step S492.
When tune direction changes or the first updated value drops on critical value outer (that is, be greater than maximum or be less than minimum value), control unit 210 terminates tuner program (step S40).
Before the end, control unit 210 first can remove the record (that is, removing the tune direction stored in memory cell 220) of tune direction.
In multiple execution mode, monitoring temperature program can be a backdrop procedure.Further, control unit 210 starts execution monitoring temperature program (step S30) every a given time (hereinafter referred to as the 3rd time).
At this, the wait of the above-mentioned very first time, the second time and the 3rd time then can utilize timer to realize.In multiple execution mode, control unit 210 can be electrically connected one or more timer 2 30.Bide one's time at need etc., control unit 210 starts timer 2 30 timing.When timer 2 30 timing reaches given time, then trigger control unit 210 continues to perform subsequent step.
For example, when control unit 210 completes start-up routine, the judgement non-acute variation of ambient temperature or terminates tuner program S40, control unit 210 starts timer 2 30 and carries out timing (step S80).When timer 2 30 timing reached for the 3rd time, trigger control unit 210 starts execution monitoring temperature program (step S30).
In multiple execution mode, control unit 210 and channel estimator 200 can be realized by one or more processing components.At this, processing components can be such as microcontroller (microcontroller; MCU), embedded controller (embedded controller), microprocessor (microprocesser; Or ASIC(Application Specific Integrated Circuit) (application specific integrated circuit MPU); ASIC) etc., but this not to its restriction.
For example, suppose that control unit 210 can be a microprocessor and a microcontroller.Monitoring temperature program and tuner program can be the work of microprocessor.
Monitoring temperature program can be a backdrop procedure, and controls a tuning mark (tuning flag).This tuning mark can be stored in memory cell 220.When judging ambient temperature acute variation, monitoring temperature program can be set to 1 by tuning mark.When the non-acute variation of judgement ambient temperature, monitoring temperature program then remains tuning and is masked as 0.
Under data pattern (data mode), microcontroller constantly can check tuning mark.When find tuning be masked as 1 time, microcontroller is then called out tuner program and is performed tuner program (step S40) suspend monitoring temperature program to cause microprocessor to start.
At power saving Ethernet pattern (energy-sufficient Ethernet mode; EEE mode) under, when find tuning be masked as 1 time, microcontroller can get back to data pattern from power saving Ethernet pattern, and data pattern calling tuner program.
Memory cell 220 can be realized by one or more memory module.At this, memory module can be such as memory or buffer etc., but at this not to its restriction.Timer 2 30 can be such as Abort Timer etc., but at this not to its restriction.
Should will be understood that, in embodiments each step description order and be not used to limit its execution sequence, in zone of reasonableness, the execution sequence of each step can change arbitrarily.For example, step S310 only need perform before step S330, and there is no the request of sequencing between step S310, step S320 and step S340; Similarly, step S330 only need perform between step S310 and step S350, and there is no the request of sequencing between step S330, step S320 and step S340.
To sum up, control method according to receiving system of the present invention and amplification coefficient thereof is applied in communications network system, it can the change of monitoring environment temperature the amplification coefficient of the tuning automatic gain controller of adaptability, thus the convergence of accelerating system promote signal quality, and then avoid system break online (linkdown) and elevator system performance.
Although the present invention with aforesaid execution mode openly as above; but itself and be not used to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore scope of patent protection of the present invention should define depending on this specification appending claims and be as the criterion.
Claims (12)
1. a control method for the amplification coefficient of receiving system, comprising:
Detect one first variable of an equivalent length of a cable;
Detect one second variable of the amplification coefficient of a digital resources obtainment device;
One first updated value of the amplification coefficient of a simulation automatic gain controller is determined according to described first variable and described second variable;
A tuning ratio between the currency calculating the described amplification coefficient of described first updated value and described simulation automatic gain controller;
One second updated value of the described amplification coefficient of described digital resources obtainment device is calculated according to described tuning ratio;
The set point of the described amplification coefficient of described simulation automatic gain controller is upgraded according to described first updated value; And
The set point of the described amplification coefficient of described digital resources obtainment device is upgraded according to described second updated value.
2. control method according to claim 1, wherein, multiple described detecting step is realized by a backdrop procedure.
3. control method according to claim 2, wherein, described backdrop procedure is triggered by a timer.
4. control method according to claim 1, wherein, described determining step comprises:
More described first variable and a first threshold;
More described second variable and a Second Threshold;
When described first variable is greater than described first threshold, according to the described amplification coefficient of the tuning described simulation automatic gain controller of an average output power of described equivalent length and described simulation automatic gain controller to obtain described first updated value;
When described second variable is greater than described Second Threshold, according to the described amplification coefficient of the tuning described simulation automatic gain controller of an average output power of described equivalent length and described simulation automatic gain controller to obtain described first updated value; And
When described first variable is not more than described first threshold and described second variable is not more than described Second Threshold, maintain the described amplification coefficient of described simulation automatic gain controller.
5. control method according to claim 4, wherein, each described tuning step comprises:
A target average power is calculated according to described equivalent length;
Calculate the described average output power of described simulation automatic gain controller; And
Increase or reduce the described amplification coefficient of described simulation automatic gain controller according to described target average power and described average output power selectivity to obtain described first updated value.
6. control method according to claim 1, wherein, the described step of updating of described digital resources obtainment device performs after the described step of updating of described simulation automatic gain controller performs and multiple described step of updating given time apart.
7. control method according to claim 6, wherein, described given time is corresponding to the component count be connected between described simulation automatic gain controller and described digital resources obtainment device.
8. a receiving system, comprising:
One front end receive circuit, has a simulation automatic gain controller;
One feed forward equalizer, is electrically connected described front end receive circuit;
One add circuit, is electrically connected described feed forward equalizer;
One digital resources obtainment device, is connected electrically between described feed forward equalizer and described add circuit;
One feedback equalizer, is electrically connected described add circuit;
One channel estimation device, in order to estimate an equivalent length of a cable; And
One control unit, be electrically connected described simulation automatic gain controller, described digital resources obtainment device and described channel estimation device, in order to determine one first updated value of the amplification coefficient of described simulation automatic gain controller according to the variable of the variable of described equivalent length and the amplification coefficient of described digital resources obtainment device, determine one second updated value of the described amplification coefficient of described digital resources obtainment device according to the tuning ratio between the currency of the described amplification coefficient of described first updated value and described simulation automatic gain controller and upgrade the set point of the described amplification coefficient of described simulation automatic gain controller and described digital resources obtainment device according to described first updated value and described second updated value respectively.
9. receiving system according to claim 8, also comprises:
One Abort Timer, detects the described variable of described equivalent length of described cable and the described variable of the described amplification coefficient of described digital resources obtainment device in order to trigger described control unit according to a given time with backdrop procedure.
10. receiving system according to claim 8, wherein, when the described variable of described equivalent length is not more than a first threshold and the described variable of the described amplification coefficient of described digital resources obtainment device is not more than a Second Threshold, described control unit maintains the described amplification coefficient of described simulation automatic gain controller; Otherwise described control unit is according to described equivalent length and the described amplification coefficient of the tuning described simulation automatic gain controller of an average output power of described simulation automatic gain controller and the described amplification coefficient according to the tuning described digital resources obtainment device of described tuning ratio.
11. receiving systems according to claim 8, wherein, upgrade described digital resources obtainment device after the given time of described control unit after upgrading described simulation automatic gain controller.
12. receiving systems according to claim 11, wherein, described given time is corresponding to the component count be connected between described simulation automatic gain controller and described digital resources obtainment device.
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| CN107919859A (en) * | 2016-10-07 | 2018-04-17 | 硅实验室公司 | The automatic growth control of amplifier gain is controlled based on the duration of overload conditions（AGC）Circuit and method |
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