CN109546983A - A kind of automatic gain control equipment and auto gain control method - Google Patents
A kind of automatic gain control equipment and auto gain control method Download PDFInfo
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- CN109546983A CN109546983A CN201811382988.7A CN201811382988A CN109546983A CN 109546983 A CN109546983 A CN 109546983A CN 201811382988 A CN201811382988 A CN 201811382988A CN 109546983 A CN109546983 A CN 109546983A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
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Abstract
A kind of automatic gain control equipment and auto gain control method, the automatic gain control equipment includes: power port, suitable for connecting to power supply；Gain adjustment voltage generation circuit, suitable for generating gain adjustment voltage according to the electric current of the power port；Automatic gain adjustment circuit is suitable for receiving the gain adjustment voltage, and the gain adjustment voltage is compared with the first predetermined voltage threshold, in response to comparison result, incremental count or countdown is executed, to obtain yield value；Variable gain circuit is suitable for receiving signal to be processed, and is adjusted according to the yield value to the signal to be processed, to obtain output signal.Technical solution of the present invention can effectively simplify circuit structure, saving components cost.
Description
Technical field
The present invention relates to carrier communication field more particularly to a kind of automatic gain control equipment and automatic gain controls
Method processed.
Background technique
Power carrier communication (Power line Communication) is the distinctive communication mode of electric system, is referred to
Using existing power line, analog or digital signal is carried out to the technology of high-speed transfer by carrier system.It is logical using power carrier
News, do not need to set up new communication network again, can be carried out data transmitting as long as using existing power line.However, due to
Complicated communication environment, for example, the fading effect (such as path loss, multipath fading etc.) and power grid of voltage Power Line Carrier Channel
The factors such as the variation of power load all can cause receiving end signal intensity to be widely varied and rise and fall, the reception to communication system
Power has a significant impact.
In order to reduce influence of the environmental factor to power carrier communication system receiving end signal, lead to usually after receiving signal
It crosses after gain adjustment circuit carries out gain adjustment to input signal and exports again.Gain adjustment circuit in the prior art, usually
Gain adjustment circuit is configured to the form of negative feedback loop.For coupling analog signals and digital signal, needs to increase D/A and turn
Circuit is changed, causes circuit structure complicated, integral device cost increases, and the D/A switch process in circuit also will affect letter
Number the processing time, cause the delay of output signal.
Summary of the invention
Present invention solves the technical problem that being the circuit structure and gain adjusting method of optimized gain adjustment circuit, improves and increase
Beneficial regulated efficiency.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of automatic gain control equipment, which is characterized in that packet
It includes: power port, suitable for connecting to power supply；Gain adjustment voltage generation circuit, suitable for raw according to the electric current of the power port
At gain adjustment voltage；Automatic gain adjustment circuit, is suitable for receiving the gain adjustment voltage, and by the gain adjustment voltage
It is compared with the first predetermined voltage threshold, in response to comparison result, incremental count or countdown is executed, to obtain gain
Value；Variable gain circuit is suitable for receiving signal to be processed, and is adjusted according to the yield value to the signal to be processed,
To obtain output signal.
Optionally, the gain adjustment voltage generation circuit includes: current detection circuit, is adapted to detect for the power port
Electric current, with obtain detection voltage；Range-adjusting circuit is suitable for receiving the detection voltage, and carries out to the detection voltage
Range-adjusting, to obtain the gain adjustment voltage.
Optionally, the current detection circuit includes: inspection flow module, and the input terminal of the inspection flow module connects the power supply
Port；Amplification module, the first input end of the amplification module connect the output end of the inspection flow module, the amplification module
Second input terminal connects the power port, and the output end of the amplification module exports the detection voltage；Pressure limiting module, it is described
The input terminal of pressure limiting module connects the output end of the amplification module, the output end ground connection of the pressure limiting module.
Optionally, the inspection flow module includes inspection leakage resistance, and the first end of the inspection leakage resistance connects the power port,
The second end of the inspection leakage resistance connects the first input end of the amplification module.
Optionally, the amplification module includes: first resistor, and the first end of the first resistor connects the inspection flow module
Output end；The first end of second resistance, the second resistance connects the power port；First operational amplifier, described
The first input end of one operational amplifier connects the second end of the first resistor, the second input of first operational amplifier
End connects the second end of the second resistance；Transistor, the grid of the transistor connect the defeated of first operational amplifier
Outlet, the source electrode of the transistor connect the second input terminal of first operational amplifier, and the drain electrode of the transistor is passed through
3rd resistor ground connection, wherein the drain electrode of the transistor is the output end of the amplification module.
Optionally, the pressure limiting module includes pressure limiting resistance, and the first end of the pressure limiting resistance connects the amplification module
Output end, the pressure limiting resistance second end ground connection.
Optionally, the range-adjusting circuit includes: the 4th resistance, and the first end of the 4th resistance connects the electric current
The output end of detection circuit, the first end of second end the 5th resistance of connection of the 4th resistance, the second of the 5th resistance
End ground connection；Second operational amplifier, the first input end of the second operational amplifier is via the 6th resistance eutral grounding, and described second
Second input terminal of operational amplifier connects the second end of the 4th resistance, the output end output of the second operational amplifier
The gain adjustment voltage；It is first defeated to connect the second operational amplifier for 7th resistance, the first end of the 7th resistance
Enter end, the second end of the 7th resistance connects the output end of the second operational amplifier；8th resistance, the 8th resistance
First end connect the first input end of the second operational amplifier, the first of the second end connection capacitor of the 8th resistance
Pole plate, the second pole plate ground connection of the capacitor.
Optionally, first predetermined voltage threshold includes default high threshold and default Low threshold, the default high threshold
Greater than the default Low threshold；The automatic gain adjustment circuit includes: first comparator, and the first of the first comparator is defeated
Enter end and receive the default high threshold, the second input terminal of the first comparator receives the gain adjustment voltage；Second ratio
Compared with device, the first input end of second comparator receives the gain adjustment voltage, the second input of second comparator
End receives the default Low threshold；Gain forward-backward counter, the first input end connection described the of the gain forward-backward counter
The output end of one comparator, the second input terminal of the gain forward-backward counter connect the output end of second comparator, institute
The control terminal for stating gain forward-backward counter receives clock signal, and the gain forward-backward counter is suitable for according to the first comparator
Incremental count or countdown and output gain value are carried out with the output signal of the second comparator.
Optionally, the variable gain circuit includes: resistance adjustment module, and the input terminal of the resistance adjustment module receives
The signal to be processed, the control terminal of the resistance adjustment module receive control signal, and the control signal is the yield value,
The equivalent resistance of the resistance adjustment module is controlled by the control signal；Third operational amplifier, the third operation are put
The first input end of big device connects the output end of the resistance adjustment module, the second input termination of the third operational amplifier
Reference voltage is received, the output end of the third operational amplifier exports the output signal；9th resistance, the 9th resistance
First end connects the first input end of the third operational amplifier, and the second end of the 9th resistance connects the third operation
The output end of amplifier.
Optionally, the resistance adjustment module includes: multiple selective gates, described in the input terminal connection of the selective gate
The input terminal of resistance adjustment module, the output end of the selective gate connect the output end of the resistance adjustment module, Mei Yixuan
Road includes concatenated control switch and gain resistor all, and the closing or opening of the control switch is by the control signal control
System.
Optionally, the automatic gain control equipment further include: undervoltage detection circuit is adapted to detect for the electricity of the power supply
Pressure, and control whether the automatic gain adjustment circuit latches the yield value according to testing result.
In order to solve the above technical problems, the embodiment of the invention also provides a kind of auto gain control method, including it is as follows
Step: detecting the electric current of power port, and the power port connects to power supply；The electric current is converted to gain adjustment voltage；
The gain adjustment voltage is compared with the first predetermined voltage threshold, in response to comparison result, incremental count is executed or passs
Subtract counting, to obtain yield value；Signal to be processed is adjusted according to the yield value, to obtain output signal.
It is optionally, described that the electric current is converted to gain adjustment voltage includes: to convert detection voltage for the electric current；
Range-adjusting is carried out to the detection voltage, to obtain the gain adjustment voltage.
Optionally, it is described by the electric current be converted into detection voltage include: to be amplified to the electric current and carry out voltage
Conversion, to obtain the detection voltage.
Optionally, the auto gain control method further include: detect the voltage of the power supply, and according to testing result really
It is fixed whether to latch the yield value.
Optionally, first predetermined voltage threshold includes default high threshold and default Low threshold, the default high threshold
Greater than the default Low threshold；The gain adjustment voltage is compared with the first predetermined voltage threshold, in response to comparing knot
Fruit executes incremental count or countdown, includes: to preset high threshold when the gain adjustment voltage reaches described to obtain yield value
When between value and default Low threshold, incremental count or countdown are not executed, and the yield value is latched.
Optionally, first predetermined voltage threshold includes default high threshold and default Low threshold, the default high threshold
Greater than the default Low threshold；The gain adjustment voltage is compared with the first predetermined voltage threshold, in response to comparing knot
Fruit executes incremental count or countdown, includes: when the gain adjustment voltage presets low threshold less than described to obtain yield value
When value, incremental count is carried out to the yield value, until being added to maxgain value until obtained gain adjustment adjusted electricity
Pressure is between the default high threshold and the default Low threshold or under the Low threshold；When the gain adjustment voltage is big
When the default high threshold, countdown is carried out to the yield value, at obtained gain adjustment voltage adjusted
Between the default high threshold and the default Low threshold or under the Low threshold.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
Automatic gain control equipment in technical solution of the present invention includes power port, suitable for connecting to power supply；Gain tune
Whole voltage generation circuit, suitable for generating gain adjustment voltage according to the electric current of the power port；Automatic gain adjustment circuit is fitted
In the reception gain adjustment voltage, and the gain adjustment voltage is compared with the first predetermined voltage threshold, in response to
Comparison result executes incremental count or countdown, to obtain yield value；Variable gain circuit is suitable for receiving signal to be processed,
And the signal to be processed is amplified according to the yield value, to obtain output signal.Technical solution of the present invention root as a result,
Counted according to gain adjustment voltage and the comparison result of the first predetermined voltage threshold, adjust gain value come with this, be omitted number/
Analog conversion circuit is effectively simplified circuit structure, has saved device cost, while shortening the time of gain adjustment, improves
The efficiency of gain adjustment.
Further, the current detection circuit includes: inspection flow module, and the input terminal of the inspection flow module connects the power supply
Port；Amplification module, the first input end of the amplification module connect the output end of the inspection flow module, the amplification module
Second input terminal connects the power port, and the output end of the amplification module exports the detection voltage；Pressure limiting module, it is described
The input terminal of pressure limiting module connects the output end of the amplification module, the output end ground connection of the pressure limiting module.Pass through conjunction as a result,
The resistance value of reason adjustment inspection flow module and pressure limiting module, it will be able to change the voltage value of the detection voltage, the regulation of electrical circuit spirit
It is living.
Further, the automatic gain control equipment further include: undervoltage detection circuit is adapted to detect for the electricity of the power supply
Pressure, and control whether the automatic gain adjustment circuit latches the yield value according to testing result.Thus, it is possible to detect in time
Whether automatic gain control equipment works in effective status, guarantees the accuracy of output signal.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of automatic gain control equipment of the embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of current detection circuit of automatic gain control equipment in Fig. 1；
Fig. 3 is a kind of structural schematic diagram of range-adjusting circuit of automatic gain control equipment in Fig. 1；
Fig. 4 is a kind of structural schematic diagram of automatic gain adjustment circuit of automatic gain control equipment in Fig. 1；
Fig. 5 is the work flow diagram of automatic gain adjustment circuit in Fig. 4；
Fig. 6 is the structural schematic diagram of the variable gain circuit of automatic gain control equipment in Fig. 1；
Fig. 7 is a kind of stream of the auto gain control method of the automatic gain control equipment based on Fig. 1 of the embodiment of the present invention
Cheng Tu.
Specific embodiment
It will be appreciated by those skilled in the art that gain adjustment circuit in the prior art, is usually configured to negative-feedback for circuit
The form of ring.For coupling analog signals and digital signal, it usually needs increase D/A switch circuit, cause circuit structure multiple
Miscellaneous, integral device cost increases, and the D/A switch process in circuit also will affect the processing time of signal, cause to export
The delay of signal.
Automatic gain control equipment in technical solution of the present invention detects power end by gain adjustment voltage generation circuit
The electric current of mouth, and generate gain adjustment voltage；Then by automatic gain adjustment circuit, by the gain adjustment voltage and first
Predetermined voltage threshold is compared, and in response to comparison result, incremental count or countdown is executed, to obtain yield value；It connects down
Come, variable gain circuit can amplify received signal to be processed according to the yield value, to obtain output signal.By
This, technical solution of the present invention can be counted according to gain adjustment voltage and the comparison result of the first predetermined voltage threshold, with
This carrys out adjust gain value, and D/A switch circuit is omitted, effectively optimizes circuit structure, has saved device cost, has shortened simultaneously
The time of gain adjustment, improve the efficiency of gain adjustment.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to existing
There are technology and specific embodiments of the present invention to be described in detail.Obviously, described embodiment is only the present invention one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
Every other embodiment obtained, belongs to protection scope of the present invention under the premise of creative work.
Fig. 1 is a kind of structural schematic diagram of automatic gain control equipment of the embodiment of the present invention.
Referring to FIG. 1, the automatic gain control equipment may include power port V, it is suitable for connecting with power supply 1；Gain
Voltage generation circuit 2 is adjusted, suitable for generating gain adjustment voltage V_PD according to the electric current of the power port V；Automatic gain tune
Whole circuit 3, is suitable for receiving the gain adjustment voltage V_PD, and by the gain adjustment voltage V_PD and the first predeterminated voltage threshold
Value is compared, and according to comparison result, incremental count or countdown is executed, to obtain yield value gain_set；Variable gain
Circuit 4 is suitable for receiving signal to be processed, and the signal to be processed is amplified or declined according to the yield value gain_set
Subtract, to obtain output signal.
In the present embodiment, the power port V can be the automatic gain control equipment and power supply 1 carries out signal interaction
Port.Power port V can be directly connected to power supply 1, or can also be connect via component appropriate with power supply 1.
Specifically, the power supply 1 can integrate inside the automatic gain control equipment, alternatively, can also external coupling
It is connected to described device.Power supply 1 can be powered for each circuit module in the automatic gain control equipment.
More specifically, the power supply 1 can be DC power supply, for example, the voltage of the power supply can be direct current 12V or
24V。
Further, the voltage of the power supply 1 can be fixed voltage, or the adjustable voltage of voltage value, with suitable
Answer the gain requirements of different signals to be processed.Those skilled in the art can according to specific requirements and application scenarios and adaptability
Select the voltage value of power supply 1.For example, when needing device work to can choose higher voltage in the higher occasion of power ratio
Value；When needing device work to can choose lower voltage value in the lower occasion of power ratio, the embodiment of the present invention to this not
It is limited.
Specifically, the variable gain circuit 4 can according to the yield value gain_set to the signal to be processed into
Row adjustment, the variable gain circuit 4 can be adjusted the amplitude of signal to be processed, such as increase or reduce and is to be processed
The amplitude of signal.
In a non-limiting embodiment, such as: the amplitude of the signal to be processed is A, the variable gain electricity
Road 4 can according to the yield value gain_set (such as: signal to be processed gain_set=2) is adjusted to original 2 times, then
The amplitude of signal adjusted is 2A.
In another non-limiting embodiment, such as: the amplitude of the signal to be processed is B, the variable gain
Circuit can according to the yield value gain_set (such as: signal to be processed gain_set=0.5) is adjusted to original 0.5
Times, then the amplitude of signal adjusted is 0.5*B.
Further, the gain adjustment voltage generation circuit 2 may include: current detection circuit 21, be adapted to detect for institute
The electric current of power port V is stated, to obtain detection voltage Vout；Range-adjusting circuit 22 is suitable for receiving the detection voltage Vout,
And range-adjusting is carried out to the detection voltage Vout, to obtain the gain adjustment voltage V_PD.
Further, the automatic gain adjustment circuit 3 executes incremental count or countdown according to clock signal clk,
The clock signal clk can be provided by clock generation circuit 5.The clock generation circuit 5 can integrate in the automatic increasing
Inside beneficial control device, alternatively, external the automatic gain control equipment can also be coupled to.
Specifically, the clock signal clk can be automatic gain adjustment circuit 3 execute counting action when based on when
Clock number.
More specifically, the clock number can be the number of pulse.
Further, the automatic gain control equipment can also include: undervoltage detection circuit 6, be adapted to detect for the electricity
The voltage in source 1, and can control whether the automatic gain adjustment circuit 3 latches the yield value gain_ according to testing result
set。
Further, the undervoltage detection circuit 6 can directly detect the voltage of power supply 1, can also be by described in reception
The electric current detected in current detection circuit 21, and convert the electric current to after voltage and detect again.
When it is implemented, if the voltage that undervoltage detection circuit 6 detects is lower than the second predetermined voltage threshold, it may be considered that
Power supply 1 cannot normally provide voltage required for device works.For example, if the normal value of supply voltage is 12V, it can be by the
Two predetermined voltage thresholds are set as 8V, if undervoltage detection circuit 6 detects the voltage of power supply 1 lower than 8V, it can be determined that electric at this time
Source 1 is in under-voltage condition.Thus, it is possible to which whether detection automatic gain control equipment works in effective status in time, guarantee automatic
Gain control can work normally.
When undervoltage detection circuit 6 detects that power supply 1 is in under-voltage condition, the gain of the output of automatic gain adjustment circuit 3
Value is latched.Within the period that power supply 1 is in under-voltage condition, the yield value that automatic gain adjustment circuit 3 exports can only be reduced,
It not can increase.
Fig. 2 is a kind of structural schematic diagram of current detection circuit of the automatic gain control equipment.
With reference to Fig. 1, Fig. 2.The current detection circuit 21 may include: inspection flow module 211, the inspection flow module
211 input terminal connects the power port V；Amplification module 212, the amplification module 212 first input end connection described in
The output end of flow module 211 is examined, the second input terminal of the amplification module 212 connects the power port V, the amplification module
212 output end exports the detection voltage Vout；Pressure limiting module 213, the pressure limiting module 213 input terminal connection described in put
The output end of big module 212, the output end ground connection of the pressure limiting module 213.
In the present embodiment, the inspection flow module 211 may include inspection leakage resistance Rsense, the inspection leakage resistance Rsense's
First end connects the power port V, and it is first defeated to connect the amplification module 212 for the second end of the inspection leakage resistance Rsense
Enter end.
Specifically, the inspection leakage resistance Rsense can be fixed resistance or variable resistance, and resistance value size can basis
Concrete application scene is configured, and the embodiment of the present invention is without limitation.
Further, the amplification module 212 may include: first resistor R1, and the first end of the first resistor R1 connects
Connect the output end of the inspection flow module 211；The first end of second resistance R2, the second resistance R2 connect the power port V；
First operational amplifier 2121, the first input end of first operational amplifier 2121 connect the second of the first resistor R1
End, the second input terminal of first operational amplifier 2121 connect the second end of the second resistance R2；Transistor P1, it is described
The grid of transistor P1 connects the output end of first operational amplifier 2121, the source electrode connection of the transistor P1 described the
The drain electrode of second input terminal of one operational amplifier 2121, the transistor P1 is grounded by 3rd resistor R3, wherein the crystalline substance
The drain electrode of body pipe P1 is the output end of the amplification module 212.Transistor P1 can be PMOS tube, and the substrate of PMOS tube can connect
To power supply.
Specifically, the first input end of first operational amplifier 2121 can be negative input end, first operation
Second input terminal of amplifier 2121 can be positive input terminal；The first resistor R1, second resistance R2 and 3rd resistor R3
It can be fixed resistance or variable resistance, resistance value size can be configured according to concrete application scene, and the present invention is implemented
Example is without limitation.
Further, the pressure limiting module 213 may include pressure limiting resistance Rlimit, and the of the pressure limiting resistance Rlimit
One end connects the output end of the amplification module 212, the second end ground connection of the pressure limiting resistance Rlimit.
Specifically, the pressure limiting resistance Rlimit can be fixed resistance or variable resistance, and resistance value size can basis
Concrete application scene is configured, and the embodiment of the present invention is without limitation.
The current detection circuit 21 can receive the electric current of the power port V, and can be public by following conversion
The electric current is converted detection voltage Vout by formula:
Wherein, IsenseFor the electric current of the power port V；Vout is the electricity of the output end of the current detection circuit 21
Pressure；The VOSFor the offset voltage of the first operational amplifier 2121, the offset voltage refers to when the first operational amplifier 2121
First input end and the second input terminal all no signal input when, the output voltage of the output end of the first operational amplifier 2121；
The first resistor R1, second resistance R2,3rd resistor R3 match putting for common realization circuit with the first operational amplifier 2121
Big effect；Rout is the resistance value after 3rd resistor R3 is in parallel with pressure limiting resistance Rlimit.
It, can be by adjusting the inspection leakage resistance Rlimit and pressure limiting electricity in the current detection circuit 21 in the present embodiment
The resistance value of Rsense is hindered the voltage value of detection voltage Vout is adjusted flexibly.
Since the electric current in the automatic gain control equipment will receive the influence of continually changing signal to be processed, because
This, the electric current I of the power port VsenseAlso it can be among constantly variation, that is to say, that the electric current with the power port V
IsenseCorresponding detection voltage Vout is also among constantly variation.Therefore, it is necessary to carry out amplitude to detection voltage Vout in real time
Adjustment.
It please also refer to Fig. 1, Fig. 2, Fig. 3.Wherein, Fig. 3 is a kind of range-adjusting electricity of the automatic gain control equipment
The structural schematic diagram on road.
The range-adjusting circuit 22 can be proportional-plusderivative controller.Specifically, the proportional-plusderivative controller packet
Include: the first end of the 4th resistance R4, the 4th resistance R4 connect the output end of the current detection circuit 21, the 4th electricity
The second end for hindering R4 connects the first end of the 5th resistance R5, the second end ground connection of the 5th resistance R5；Second operational amplifier
221, the first input end of the second operational amplifier 221 is grounded via the 6th resistance R6, the second operational amplifier 221
The second input terminal connect the second end of the 4th resistance R4, described in the output end output of the second operational amplifier 221
Gain adjustment voltage V_PD；The first end of 7th resistance R7, the 7th resistance R7 connect the second operational amplifier 221
The second end of first input end, the 7th resistance R7 connects the output end of the second operational amplifier 221；8th resistance
The first end of R8, the 8th resistance R8 connect the first input end of the second operational amplifier 221, the 8th resistance R8
Second end connection capacitor C the first pole plate, the capacitor C the second pole plate ground connection.
Specifically, the first input end of the second operational amplifier 221 can be negative input end, and second operation is put
Second input terminal of big device 221 can be positive input terminal；The 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th electricity
Hinder R7 and the 8th resistance R8 can be fixed resistance or variable resistance, resistance value size can according to concrete application scene come into
Row setting, the embodiment of the present invention are without limitation.
The effect of proportional component was reacted to deviation moment in the proportional-plusderivative controller.In the present embodiment,
The deviation refers to voltage (i.e. detection voltage Vout) voltage between two adjacent moments of 22 input terminal of range-adjusting circuit
The variable quantity of amplitude.During range-adjusting, controller generates control action, and deviation can be promoted to become to reduced direction
Change.The power of control action depends on proportionality coefficient, and proportionality coefficient is bigger, and control action is stronger, then transient process is faster, control
The static deviation of process is also just smaller.But proportionality coefficient is bigger, is also more easy to produce oscillation, destroys the stability of system.Therefore
And proportionality coefficient selection appropriately must be just able to achieve when transit time is less, while reach that static difference is small and system is stable
Effect.
The effect of differentiation element is the moment in change of error in the proportional-plusderivative controller, can be according to deviation
Variation tendency provides correction appropriate in advance, prevents the variation of deviation.Specifically, differentiation element can be according to the variation speed of deviation
Degree is controlled.Change of error it is faster, the output of derivative controller is bigger, and can be repaired before deviation becomes larger
Just.The introducing of the differential action, it will help reduce overshoot, overcome oscillation, system is made to tend towards stability.The control that differential part plays
The power of production is determined by derivative time constant.When derivative time constant is bigger, then differentiation element inhibits the work of change of error
With stronger；Derivative time constant is got over hour, then the effect of differentiation element resistance change of error is weaker.Properly select derivative time
Constant can be such that the differential action is optimal.
In the present embodiment, ratio-is carried out by the voltage (i.e. detection voltage Vout) to 22 input terminal of range-adjusting circuit
Differential regulation reduces the overshoot in detection voltage Vout amplitude, with the voltage after being adjusted, as the increasing in subsequent conditioning circuit
Benefit adjustment voltage V_PD.
Using the 22 calculated gain voltage of range-adjusting circuit in attached drawing 3 V_PD's specific formula is as follows:
Wherein, V_PD is gain adjustment voltage, and Vout is detection voltage；
For the proportionality coefficient of proportional component；R8 × C is that the derivative time of differentiation element is normal
Number.R4 is the resistance value of the 4th resistance R4, and r5 is the resistance value of the 5th resistance R5, and r6 is the resistance value of the 6th resistance R6, and r7 is
The resistance value of 7th resistance R7, r8 are the resistance value of the 8th resistance R8.
It should be noted that, although proportion of utilization-differential controls to carry out the deviation of voltage magnitude in the embodiment of the present invention
Adjustment, those skilled in the art can also select other suitable control modes according to concrete application scene.For example, it is also possible to select
Select proportional integral differential control, proportional, integral control, fuzzy control, fuzzy-proportional integral differential control, neural network
The control mode of one or more deviation adjustings such as control, the embodiment of the present invention are without limitation.
It please collective reference Fig. 1, Fig. 4.Wherein, Fig. 4 is the automatic increasing of one kind of automatic gain adjustment device of the embodiment of the present invention
The structural schematic diagram of beneficial adjustment circuit.
In the present embodiment, first predetermined voltage threshold includes default high threshold and default Low threshold, the default height
Threshold value is greater than the default Low threshold.Wherein, first predetermined voltage threshold can be configured according to specific requirements, but not
More than the voltage of power supply 1.
Further, the automatic gain adjustment circuit 3 may include: first comparator 31, the first comparator
First input end receives the default high threshold, and the second input terminal of the first comparator 31 receives the gain adjustment voltage
V_PD；Second comparator 32, the first input end of second comparator 32 receive the gain adjustment voltage V_PD, and described the
Second input terminal of two comparators 32 receives the default Low threshold；Gain forward-backward counter 33, the gain forward-backward counter
33 first input end connects the output end of the first comparator 31, and the second input terminal of the gain forward-backward counter 33 connects
The output end of second comparator 32 is connect, the control terminal of the gain forward-backward counter 33 receives clock signal clk, the increasing
Increasingly down counter 33 be suitable for being carried out according to the first comparator 31 and the output signal of the second comparator 32 incremental count or
Countdown and output gain value gain_set.
Specifically, the first input end of the first comparator 31 can be negative input end, the first comparator 31
Second input terminal can be positive input terminal；The first input end of second comparator 32 can be negative input end, described second
Second input terminal of comparator 32 can be positive input terminal.
When it is implemented, the first comparator 31 by the gain adjustment voltage V_PD compared with default high threshold, institute
The second comparator 32 is stated by the gain adjustment voltage V_PD compared with default Low threshold.The gain forward-backward counter 33 can be with
Increasing counting action and decreasing order counting action are carried out according to the first comparator 31 and the output signal of the second comparator 32.
When specifically executing counting operation, initial minimum gain value can be set for the gain forward-backward counter 33,
For example, minimum gain value can be set to 000, described 000 as binary digit form.
Next, the gain forward-backward counter 33 can carry out plus/minus counting using binary counting mode.For example,
Can successively carry out plus counting are as follows: 000,001,010,011 ...
Below according to the size for the gain adjustment voltage V_PD that the input terminal of the automatic gain adjustment circuit 3 receives,
The course of work that the gain forward-backward counter 33 can occur in counting process is illustrated.
It please also refer to Fig. 1, Fig. 5, wherein Fig. 5 is the work flow diagram of the automatic gain adjustment circuit of Fig. 4.
If obtaining initial gain adjustment voltage V_PD higher than described after the automatic gain control equipment powers on
Default high threshold, then turn off operational amplifier all in the automatic gain control equipment, the automatic gain control equipment
It does not work, at this point, energization should be re-started, then starts follow-up work process.
If obtaining initial gain adjustment voltage V_PD not higher than institute after the automatic gain control equipment powers on
Default high threshold is stated, then following workflow can occur:
Workflow one:
When gain adjustment voltage V_PD reaches between default high threshold and default Low threshold, the first comparator 31 is defeated
Low level out, second comparator 32 export low level, and gain forward-backward counter 33 is at the clock frequency interval of setting at this time
Afterwards, without counting operation, yield value gain_set is latched.
Workflow two:
When gain adjustment voltage V_PD is less than default Low threshold, the first comparator 31 exports low level, and described the
Two comparators 32 export high level, and it is dynamic can to carry out incremental count according to the clock frequency of setting for gain forward-backward counter 33 at this time
Make, i.e., successively increased since 000, until being added to maxgain value, the maxgain value can be with being represented in binary as
111.Gain forward-backward counter 33 is behind the clock frequency interval of setting at this time, without counting operation, by yield value gain_
Set is latched.
Workflow three:
When gain adjustment voltage V_PD is less than default Low threshold, the first comparator 31 exports low level, and described the
Two comparators 32 export high level, and it is dynamic can to carry out incremental count according to the clock frequency of setting for gain forward-backward counter 33 at this time
Make, i.e., is successively increased since 000.
During yield value gain_set increases, the current signal that current detection circuit 21 detects becomes constantly
Change, that is to say, that gain adjustment voltage V_PD is also constantly changing.If gain adjustment voltage V_PD, which reaches, presets high threshold
When between value and default Low threshold, then first comparator 31 exports low level, and second comparator 32 exports low level, at this time
Gain forward-backward counter 33 no longer carries out counting action, by yield value gain_ in the next cycle of the clock frequency of setting
Set is latched.
Workflow four:
When gain adjustment voltage V_PD is less than default Low threshold, the first comparator 31 exports low level, and described the
Two comparators 32 export high level, and it is dynamic can to carry out incremental count according to the clock frequency of setting for gain forward-backward counter 33 at this time
Make, i.e., is successively increased since 000.
During yield value gain_set increases, the current signal that current detection circuit 21 detects becomes constantly
Change, that is to say, that gain adjustment voltage V_PD is also constantly changing.If increasing during yield value gain_set increases
There is no the stages by being between default Low threshold and default high threshold by benefit adjustment voltage V_PD, but directly reach and be greater than
The stage of default high threshold, then first comparator 31 exports high level, and second comparator 21 exports low level, at this time gain
For forward-backward counter 33 in the next cycle of the clock frequency of setting, yield value gain_set will reduce a gear.
If yield value gain_set reduce a gear after, gain adjustment voltage V_PD there is no through being in preset it is low
Stage between threshold value and default high threshold, but directly reach the stage for being less than default Low threshold, then first comparator 31 is defeated
Low level out, second comparator 32 export high level, and gain forward-backward counter 33 is under the clock frequency of setting at this time
When a cycle, yield value gain_set is latched in no longer progress incremental count movement.
Workflow five:
When gain adjustment voltage V_PD is less than default Low threshold, the first comparator 31 exports low level, and described the
Two comparators 32 export high level, and gain forward-backward counter 33 carries out incremental count movement according to the clock frequency of setting at this time,
Successively increased since 000.
Yield value gain_set increase during, if gain adjustment voltage V_PD there is no through being in default Low threshold and
Stage between default high threshold, but directly reach the stage for being greater than default high threshold, then gain forward-backward counter 33 is being set
When the next cycle of fixed clock frequency, yield value gain_set is reduced into a gear.If after reducing a gear, increased
Default high threshold is still greater than in benefit adjustment voltage V_PD, then first comparator 31 exports high level, and the second comparator 32 exports low
Level, gain forward-backward counter 33 continues in the next cycle of the clock frequency of setting by yield value gain_set at this time
Reduce a gear.If default high threshold is still greater than in gain adjustment voltage V_PD, then continues to increase after reducing a gear
Benefit value gain_set reduces a gear.At this point, if gain adjustment voltage V_PD reach default high threshold and default Low threshold it
Between, then gain forward-backward counter 33 can be behind the clock frequency interval of setting, without counting operation, by yield value gain_
Set is latched.
It should be noted that, although the five kind work that may have of the embodiment of the present invention to automatic gain adjustment circuit 3
Process is described in detail.Since gain adjustment voltage V_PD is constantly changing, the work of automatic gain adjustment circuit 3
Above-mentioned five kinds are not limited to as process, there may also be other workflows, the embodiment of the present invention is without limitation.
In addition, above-mentioned five kinds of workflows be not it is isolated, as gain adjustment voltage V_PD constantly changes, five kinds of works
Make mutually switch between process.Such as: automatic gain adjustment circuit 3 enters after workflow five, yield value gain_
Set is successively increased since 000, during yield value gain_set increases, is greater than if gain adjustment voltage V_PD is directly reached
Yield value gain_set can then be reduced a gear by the stage of default high threshold.If after reducing a gear, gain adjustment
Default high threshold is still greater than in voltage V_PD, then continues yield value gain_set reducing a gear.At this point, if gain adjustment
Voltage V_PD reaches between default high threshold and default Low threshold, then gain forward-backward counter 33 can be in the clock frequency of setting
Behind interval, without counting operation, yield value gain_set is latched.That is, in this case, automatic gain adjustment
Circuit 3 can jump to working condition one from working condition five.
After the completion of any operative process of the workflow one into workflow five, yield value gain_set can be kept
To signal end of transmission to be processed.The step of providing in Fig. 5 can be re-executed when signal to be processed next time starts transmission.
It please also refer to Fig. 1, Fig. 6, wherein described Fig. 6 is that one kind of gain automatic control device of the embodiment of the present invention can
The structural schematic diagram of variable-gain circuit.
The variable gain circuit 4 may include: resistance adjustment module 41, the input termination of the resistance adjustment module 41
The signal to be processed is received, the control terminal of the resistance adjustment module 41 receives control signal, and the control signal is the increasing
Beneficial value gain_set, the equivalent resistance of the resistance adjustment module 41 are controlled by the control signal；Third operational amplifier
42, the first input end of the third operational amplifier 42 connects the output end of the resistance adjustment module 41, the third fortune
The second input terminal for calculating amplifier 42 receives reference voltage Vref, and the output end output of the third operational amplifier 42 is described defeated
Signal out；The first end of 9th resistance R9, the 9th resistance R9 connect the first input end of the third operational amplifier 42,
The second end of the 9th resistance R9 connects the output end of the third operational amplifier 42.
Specifically, the reference voltage Vref can be configured according to specific requirements, but be not more than the voltage of power supply 1.
For example, reference voltage Vref can be set to the half of the voltage of power supply 1.
Further, the resistance adjustment module 41 may include: multiple selective gates, the input terminal of the selective gate
The input terminal of the resistance adjustment module 41 is connected, the output end of the selective gate connects the defeated of the resistance adjustment module 41
Outlet, each selective gate may include concatenated control switch and gain resistor, the closing or opening of the control switch by
The control signal control.
Specifically, given each yield value gain_set both corresponds to the resistance of gain resistor in a selective gate
Value.That is, can be accessed after the control switch in each selective gate is closed for the resistance adjustment module 41
The gain resistor of different resistance values.
In a non-limiting embodiment, the resistance adjustment module 41 can have 8 selective gates, Mei Gexuan
Road respectively corresponds to the resistance value of a gear all, i.e. resistance adjustment module 41 can have 8 gears, and 8 gears can be by
It is ranked up according to the resistance value size of gain resistor.Yield value gain_set controls the gain electricity of different stalls as control signal
Resistance access resistance adjustment module 41.
It please also refer to Fig. 1, Fig. 7, wherein Fig. 7 is that one kind of the embodiment of the present invention is based on the automatic gain control equipment
Auto gain control method flow chart.
The gain control method may include steps of:
Step S1: detecting the electric current of power port, and the power port connects to power supply；
Step S2: the electric current is converted to gain adjustment voltage；
Step S3: the gain adjustment voltage is compared with the first predetermined voltage threshold, in response to comparison result, is held
Row incremental count or countdown, to obtain yield value；
Step S4: signal to be processed is adjusted according to the yield value, to obtain output signal.
Further, it is described the electric current be converted to gain adjustment voltage include: by the electric current be converted into detection electricity
Pressure；Range-adjusting is carried out to the detection voltage, to obtain the gain adjustment voltage.
Further, it is described by the electric current be converted into detection voltage include: to be amplified to the electric current and carry out electricity
Pressure conversion, to obtain the detection voltage.
Further, the auto gain control method further include: detect the voltage of the power supply, and according to testing result
Determine whether to latch the yield value.
Further, first predetermined voltage threshold may include presetting high threshold and default Low threshold, described default
High threshold is greater than the default Low threshold；The gain adjustment voltage V_PD is compared with the first predetermined voltage threshold, is rung
Incremental count or countdown should be executed in comparison result, include: when the gain adjustment electricity to obtain yield value gain_set
When pressure V_PD is reached between the default high threshold and default Low threshold, incremental count or countdown are not executed, and will be described
Yield value gain_set is latched.
Further, first predetermined voltage threshold includes presetting high threshold and default Low threshold, described to preset high threshold
Value is greater than the default Low threshold；The gain adjustment voltage V_PD is compared with the first predetermined voltage threshold, in response to
Comparison result executes incremental count or countdown, includes: as the gain adjustment voltage V_ to obtain yield value gain_set
When PD is less than the default Low threshold, incremental count is carried out to the yield value gain_set, until obtained increasing adjusted
Benefit adjustment voltage is between the default high threshold and the default Low threshold or under the Low threshold；When the gain tune
When whole voltage is greater than the default high threshold, countdown is carried out to the yield value, until obtained gain tune adjusted
Whole voltage is between the default high threshold and the default Low threshold or under the Low threshold.
About the detailed description of auto gain control method in Fig. 7, Fig. 1 is referred into Fig. 6 about automatic gain control
The working principle of device processed and the associated description of workflow, which is not described herein again.
It should be noted that the voltage value of " high level " and " low level " in present specification and be not specifically limited,
As long as the voltage value of high level is higher than low level voltage value.For example, the voltage value of high level can be identified as logic
1, and low level voltage value can be identified as logical zero.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (17)
1. a kind of automatic gain control equipment characterized by comprising
Power port, suitable for connecting to power supply；
Gain adjustment voltage generation circuit, suitable for generating gain adjustment voltage according to the electric current of the power port；
Automatic gain adjustment circuit is suitable for receiving the gain adjustment voltage, and the gain adjustment voltage is preset with first
Voltage threshold is compared, and in response to comparison result, incremental count or countdown is executed, to obtain yield value；
Variable gain circuit is suitable for receiving signal to be processed, and is adjusted according to the yield value to the signal to be processed,
To obtain output signal.
2. automatic gain control equipment according to claim 1, which is characterized in that the gain adjustment voltage generation circuit
Include:
Current detection circuit is adapted to detect for the electric current of the power port, to obtain detection voltage；
Range-adjusting circuit is suitable for receiving the detection voltage, and carries out range-adjusting to the detection voltage, described to obtain
Gain adjustment voltage.
3. automatic gain control equipment according to claim 2, which is characterized in that the current detection circuit includes:
Flow module is examined, the input terminal of the inspection flow module connects the power port；
Amplification module, the first input end of the amplification module connect the output end of the inspection flow module, the amplification module
Second input terminal connects the power port, and the output end of the amplification module exports the detection voltage；
Pressure limiting module, the input terminal of the pressure limiting module connect the output end of the amplification module, the output of the pressure limiting module
End ground connection.
4. automatic gain control equipment according to claim 3, which is characterized in that the inspection flow module includes inspection galvanic electricity
Resistance, the first end of the inspection leakage resistance connect the power port, and the second end of the inspection leakage resistance connects the amplification module
First input end.
5. automatic gain control equipment according to claim 3, which is characterized in that the amplification module includes:
First resistor, the first end of the first resistor connect the output end of the inspection flow module；
The first end of second resistance, the second resistance connects the power port；
The first input end of first operational amplifier, first operational amplifier connects the second end of the first resistor, institute
The second input terminal for stating the first operational amplifier connects the second end of the second resistance；
Transistor, the grid of the transistor connect the output end of first operational amplifier, and the source electrode of the transistor connects
The second input terminal of first operational amplifier is connect, the drain electrode of the transistor is grounded by 3rd resistor, wherein the crystalline substance
The drain electrode of body pipe is the output end of the amplification module.
6. automatic gain control equipment according to claim 3, which is characterized in that the pressure limiting module includes pressure limiting electricity
Resistance, the first end of the pressure limiting resistance connect the output end of the amplification module, the second end ground connection of the pressure limiting resistance.
7. automatic gain control equipment according to claim 2, which is characterized in that the range-adjusting circuit includes:
4th resistance, the first end of the 4th resistance connect the output end of the current detection circuit, the 4th resistance
Second end connects the first end of the 5th resistance, the second end ground connection of the 5th resistance；
Second operational amplifier, the first input end of the second operational amplifier is via the 6th resistance eutral grounding, second fortune
The second input terminal for calculating amplifier connects the second end of the 4th resistance, and the output end of the second operational amplifier exports institute
State gain adjustment voltage；
7th resistance, the first end of the 7th resistance connect the first input end of the second operational amplifier, and the described 7th
The second end of resistance connects the output end of the second operational amplifier；
8th resistance, the first end of the 8th resistance connect the first input end of the second operational amplifier, and the described 8th
First pole plate of the second end connection capacitor of resistance, the second pole plate ground connection of the capacitor.
8. automatic gain control equipment according to claim 1, which is characterized in that first predetermined voltage threshold includes
Default high threshold and default Low threshold, the default high threshold are greater than the default Low threshold；
The automatic gain adjustment circuit includes:
The first input end of first comparator, the first comparator receives the default high threshold, the first comparator
Second input terminal receives the gain adjustment voltage；
The first input end of second comparator, second comparator receives the gain adjustment voltage, second comparator
The second input terminal receive the default Low threshold；
The first input end of gain forward-backward counter, the gain forward-backward counter connects the output end of the first comparator,
Second input terminal of the gain forward-backward counter connects the output end of second comparator, the gain forward-backward counter
Control terminal receives clock signal, and the gain forward-backward counter is suitable for the output according to the first comparator and the second comparator
Signal carries out incremental count or countdown and exports the yield value.
9. automatic gain control equipment according to claim 1, which is characterized in that the variable gain circuit includes:
The input terminal of resistance adjustment module, the resistance adjustment module receives the signal to be processed, the resistance adjustment module
Control terminal receive control signal, the control signal is the yield value, the equivalent resistance of the resistance adjustment module by
The control signal control；
Third operational amplifier, the first input end of the third operational amplifier connect the output of the resistance adjustment module
End, the second input terminal of the third operational amplifier receive reference voltage, the output end output of the third operational amplifier
The output signal；
9th resistance, the first end of the 9th resistance connect the first input end of the third operational amplifier, and the described 9th
The second end of resistance connects the output end of the third operational amplifier.
10. automatic gain control equipment according to claim 9, which is characterized in that the resistance adjustment module includes:
Multiple selective gates, the input terminal of the selective gate connect the input terminal of the resistance adjustment module, and the gating is logical
The output end on road connects the output end of the resistance adjustment module, and each selective gate includes concatenated control switch and gain electricity
Resistance, the closing or opening of the control switch are controlled by the control signal.
11. automatic gain control equipment according to claim 1, which is characterized in that further include:
Undervoltage detection circuit is adapted to detect for the voltage of the power supply, and controls the automatic gain adjustment electricity according to testing result
Whether the yield value is latched in road.
12. a kind of auto gain control method, which comprises the steps of:
The electric current of power port is detected, the power port connects to power supply；
The electric current is converted to gain adjustment voltage；
The gain adjustment voltage is compared with the first predetermined voltage threshold, in response to comparison result, executes incremental count
Or countdown, to obtain yield value；
Signal to be processed is adjusted according to the yield value, to obtain output signal.
13. auto gain control method according to claim 12, which is characterized in that described that the electric current is converted to increasing
Benefit adjusts voltage
Detection voltage is converted by the electric current；
Range-adjusting is carried out to the detection voltage, to obtain the gain adjustment voltage.
14. auto gain control method according to claim 13, which is characterized in that described to convert inspection for the electric current
Surveying voltage includes:
Voltage conversion is amplified and carries out, to the electric current to obtain the detection voltage.
15. auto gain control method according to claim 12, which is characterized in that further include:
The voltage of the power supply is detected, and determines whether to latch the yield value according to testing result.
16. auto gain control method according to claim 12, which is characterized in that the first predetermined voltage threshold packet
Default high threshold and default Low threshold are included, the default high threshold is greater than the default Low threshold；
It is described to be compared the gain adjustment voltage with the first predetermined voltage threshold, in response to comparison result, executes and be incremented by
Counting or countdown include: to obtain yield value
When the gain adjustment voltage reaches between the default high threshold and default Low threshold, incremental count is not executed or is passed
Subtract counting, and the yield value is latched.
17. auto gain control method according to claim 12, which is characterized in that the first predetermined voltage threshold packet
Default high threshold and default Low threshold are included, the default high threshold is greater than the default Low threshold；
It is described to be compared the gain adjustment voltage with the first predetermined voltage threshold, in response to comparison result, executes and be incremented by
Counting or countdown include: to obtain yield value
When the gain adjustment voltage is less than the default Low threshold, incremental count is carried out to the yield value, until obtaining
Gain adjustment voltage adjusted be between the default high threshold and the default Low threshold or under the Low threshold；
When the gain adjustment voltage is greater than the default high threshold, countdown is carried out to the yield value, until obtaining
Gain adjustment voltage adjusted be between the default high threshold and the default Low threshold or under the Low threshold.
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| CN111786691A (en) * | 2020-07-13 | 2020-10-16 | 北京百瑞互联技术有限公司 | Automatic gain control method and system of receiver |
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