CN103825617B - Device and method for conditioning front-end analog signal of broadband data collecting system - Google Patents
Device and method for conditioning front-end analog signal of broadband data collecting system Download PDFInfo
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- CN103825617B CN103825617B CN201410070664.5A CN201410070664A CN103825617B CN 103825617 B CN103825617 B CN 103825617B CN 201410070664 A CN201410070664 A CN 201410070664A CN 103825617 B CN103825617 B CN 103825617B
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Abstract
The invention provides a device and method for conditioning a front-end analog signal of a broadband data collecting system. The device comprises a direct-current/alternating-current signal selection circuit, a signal attenuation and compensation circuit, a voltage follower circuit, a programmable amplifying circuit, a level moving circuit and a controller. The output end of the direct-current/alternating-current signal selection circuit is connected with the signal attenuation and compensation circuit. The output end of the signal attenuation and compensation circuit is connected with the voltage follower circuit. The output end of the voltage follower circuit is connected with the programmable amplifying circuit. The output end of the programmable amplifying circuit is connected with the level moving circuit. The level moving circuit outputs the front-end analog signal which is processed by a processing device of the front-end analog signal of the broadband data collecting system to a multi-channel AD converter connected with the level moving circuit so that the processed front-end analog signal can be sampled. The output end of the controller controls operation of all the modules by outputting control signals. By the adoption of the device and method for conditioning the front-end analog signal of the broadband data collecting system, analog signals with the frequency ranging from the direct current to 100Mhz and the amplitude ranging from zero to 200 V can be conditioned.
Description
Technical field
The present invention relates to technical field of electric power, more particularly, to a kind of wideband data acquisition system front end analogue signal condition dress
Put and method.
Background technology
For technical field of optical fiber sensing, two kinds of important technology are light source technology and light signal collection technology.?
In light signal collection technology, the optical signal of collection is needed to be broadly divided into two kinds：Optical interference signals and light scattering signal, wherein light are done
Relate to signal after opto-electronic conversion, the signal frequency changed out is relatively low, go to process using low-speed circuits；Light scattering signal
After opto-electronic conversion, the signal frequency changed out is high, needs high speed circuit to go to process.
Because the technology that present modulus (AD) is sampled is highly developed, for the signal characteristic of different frequency, Ke Yixuan
Go to process with different AD converters.
But the difficult point of the AD Sampling techniques of prior art is the process to AD sampling front-end analogue signal, that is, whole
The process of the front end analogue signal of individual data collecting system, this directly determines the degree of accuracy of the data of rear class AD sampling.
There is no the technology that AD sampling front-end analogue signal can be carried out with high Precision Processing in prior art.
Content of the invention
The technical problem to be solved in the present invention is, provides a kind of wideband data acquisition system front end analogue signal condition skill
Art, especially a kind of can be 0 analogue signal that arrive 200V for direct current to 100Mhz, amplitude with processing frequency conditioning technology.
For solving above-mentioned technical problem, scheme of the present invention is：
A kind of processing meanss of wideband data acquisition system front end analogue signal, including：AC/DC signal behavior electricity
Road, signal attenuation and compensation circuit, voltage follower circuit, programmable amplifying circuit, voltage movement circuit and controller；
The outfan of described AC/DC signal selecting circuit is connected with compensation circuit with described signal attenuation；Described letter
Number decay is connected with described voltage follower circuit with the outfan of compensation circuit；The outfan of described voltage follower circuit with described
Programmable amplifying circuit connects；The outfan of described programmable amplifying circuit is connected with described voltage movement circuit；
Described voltage movement circuit the processing meanss of this wideband data acquisition system front end analogue signal are processed after before
End analog signal output carries out sampling processing to connected multichannel AD converter.
The outfan of described controller and described AC/DC signal selecting circuit, signal attenuation and compensation circuit, voltage
Follow circuit, programmable amplifying circuit, voltage movement circuit connect, and control its operation by output control signal.
Wherein, described AC/DC signal selecting circuit is made up of with relay RE1 electric capacity C1；Relay RE1 has 1-
No. 4 pins, wherein No. 1 pin is control end, and this No. 1 pin is connected with the I/O port of described controller by a resistance R13,
Junction point is CH1_ACDC.
Wherein, described signal attenuation and compensation circuit be by fixed capacity C2 in parallel and tunable capacitor C2*, and parallel connection
Fixed capacity C3 and tunable capacitor C3*, and resistance R1, R2, R3, R4 and relay TQ2-5V composition, described relay TQ2-
5V has 1-10 pin, and wherein No. 10 pins are control end, are connected with described controller by PNP type triode Q1
Connect, junction point is CH1_ATT.
Wherein, described voltage follower circuit using high accuracy, at a high speed, the track to track operational amplifier of high input impedance
U5AD8065；
Described programmable amplifying circuit is using referring to programmable amplifier AD603；
Described voltage movement circuit is made up of with the capacitance resistance ware being connected it operational amplifier U7.
Another aspect of the present invention provides a kind of wideband data acquisition system front end analogue signal condition method, and it is based on aforementioned
Wideband data acquisition system front end analogue signal processing meanss realize, including：
Receiving front-end analogue signal；
Described AC/DC signal selecting circuit carries out coupling to described front end analogue signal under the control of described controller
Conjunction is processed；
Front end analogue signal through the coupling of described AC/DC signal selecting circuit enters described signal attenuation and compensates electricity
Road carries out signal attenuation process and compensation deals, and the deamplification obtaining high internal resistance is to meet described voltage follower circuit for defeated
Enter the requirement of voltage；
The deamplification of described high internal resistance inputs to described voltage follower circuit, and this voltage follower circuit is high interior to input
The deamplification of resistance carries out impedance conversion, and the front end analogue signal exporting little internal resistance is to described programmable amplifying circuit；
Described programmable amplifying circuit obtains bipolar letter to inputting after front end analogue signal therein is amplified processing
Number；
Described voltage movement circuit by described bipolar signal be converted into after unipolar signal exporting to described broadband number
Carry out sampling processing according to the multichannel AD converter that acquisition system front end analogue signal processing connects.
Wherein, described AC/DC signal selecting circuit under the control of described controller to described front end analogue signal
The step carrying out coupling processing, including：
Described controller sends opening of the relay RE1 of a level signal described AC/DC signal selecting circuit of control
Close；
During described relay RE1 closure, described AC/DC signal selecting circuit is in direct-current coupling mode and using straight
Stream coupled modes carry out coupling processing to described front end analogue signal；
When described relay RE1 opens, described AC/DC signal selecting circuit is in AC coupled mode and using friendship
Stream coupled modes carry out coupling processing to described front end analogue signal.
Wherein, through described AC/DC signal selecting circuit coupling front end analogue signal enter described signal attenuation with
The step that compensation circuit carries out signal attenuation process includes：
When the attenuation multiple default setting of described signal attenuation and compensation circuit is 2 times of decay；
Described entering signal decay is N with the front end analogue signal of compensation circuit, when this front end analogue signal N is peak-to-peak value
During signal less than 10V, give tacit consent to its 2 times of decay, the front end analogue signal after attenuation processing is N* (R2+R3+R4)/(R1+R2+
R3+R4)=1/2*N；When this front end analogue signal N is signal between 10V～400V for the peak-to-peak value, give tacit consent to its decay 50
Times, the front end analogue signal after attenuation processing is N*R4/R1+R2+R3+R4=1/50*N, wherein, R1 in formula, R2, R3,
R4 is respectively the resistance of resistance R1, R2, R3, R4.
Wherein, to obtain one bipolar to inputting after front end analogue signal therein is amplified processing for described programmable amplifying circuit
The step of property signal, including：
Produce a voltage signal by 12 D/A converter of a two-way；
This voltage signal is inputted to the input in described programmable amplifying circuit, with control this programmable amplifying circuit with
The corresponding amplification of this voltage signal is amplified process to described front end analogue signal and obtains bipolar signal.
Wherein, the step that described bipolar signal is converted into unipolar signal by described voltage movement circuit, including：
Produce another voltage signal by described 12 D/A converter of two-way；
This voltage signal is inputted to the input in described voltage movement circuit, to control this voltage movement circuit by institute
State bipolar signal and be converted into unipolar signal.
Compared with prior art, the wideband data acquisition system front end analogue signal regulating device of the present invention and method have
Following beneficial effect：
Wideband data acquisition system front end analogue signal regulating device and method that the present invention provides, with processing frequency can be
Direct current is the 0 front end analogue signal arriving 200V to 100Mhz, amplitude, is to carry out sampling to front end analogue signal to provide guarantee,
Precision that front end analogue signal is sampled and accuracy are greatly improved.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the conditioning device embodiment one of wideband data acquisition system front end analogue signal of the present invention
Figure.
Fig. 2 is the structural representation of the conditioning device embodiment two of wideband data acquisition system front end analogue signal of the present invention
Figure.
Fig. 3 is that the flow process of the Opsonizing method embodiment one of wideband data acquisition system front end analogue signal of the present invention is illustrated
Figure.
Specific embodiment
In order to solve front end analogue signal cannot to be carried out present in above prior art processing a difficult problem, the present invention proposes
A kind of conditioning device of wideband data acquisition system front end analogue signal and method, can apply simultaneously to interference signal and dissipate
Penetrate the process of signal, the process of other Signal Collection Technology field associated analog signals can also be widened.Manageable mould
The frequency of plan signal is from direct current to 100Mhz, amplitude is -200V to 200V.
As shown in figure 1, a kind of processing meanss of wideband data acquisition system front end analogue signal of present invention offer, this dress
After putting for nursing one's health to front end analogue signal, input the multichannel AD converter connecting as it and carry out AD sampling processing,
It specifically includes：
AC/DC signal selecting circuit 10, signal attenuation and compensation circuit 11, voltage follower circuit 12, programming amplifying
Circuit 13, voltage movement circuit 14 and controller 15；
The outfan of described AC/DC signal selecting circuit 10 is connected with compensation circuit 11 with described signal attenuation；Institute
State signal attenuation to be connected with described voltage follower circuit 12 with the outfan of compensation circuit 11；Described voltage follower circuit 12 defeated
Go out end to be connected with described programmable amplifying circuit 13；The outfan of described programmable amplifying circuit 13 is with described voltage movement circuit 14 even
Connect；
After the processing meanss of this wideband data acquisition system front end analogue signal are processed by described voltage movement circuit 14
Front end analogue signal output to connected multichannel AD converter 2 carries out sampling processing.
The outfan of described controller 15 and described AC/DC signal selecting circuit 10, signal attenuation and compensation circuit
11st, voltage follower circuit 12, programmable amplifying circuit 13, voltage movement circuit 14 connect, and control its fortune by output control signal
OK.
In implementing, as shown in Figure 2：
Described AC/DC signal selecting circuit is made up of with relay RE1 electric capacity C1；Relay RE1 has No. 1-4 and draws
Foot, wherein No. 1 pin is control end, and this No. 1 pin is connected with the I/O port of described controller (not shown) by a resistance R13
Connect, junction point is CH1_ACDC.
And described signal attenuation and compensation circuit are by fixed capacity C2 in parallel and tunable capacitor C2*, and the consolidating of parallel connection
Determine electric capacity C3 and tunable capacitor C3*, and resistance R1, R2, R3, R4 and relay TQ2-5V composition, described relay TQ2-5V
There is 1-10 pin, wherein No. 10 pins are control end, by PNP type triode Q1 and described controller (not shown)
It is connected, junction point is CH1_ATT.
Wherein, described voltage follower circuit using high accuracy, at a high speed, the track to track operational amplifier of high input impedance
U5AD8065；Described programmable amplifying circuit is using referring to programmable amplifier AD603；Described voltage movement circuit is by operational amplifier U7
With the capacitance resistance ware composition being connected it.
Another aspect of the present invention provides a kind of wideband data acquisition system front end analogue signal condition method, and it is based on aforementioned
Wideband data acquisition system front end analogue signal processing meanss realize, as shown in figure 3, its concrete steps includes：
Step 100, receiving front-end analogue signal；
Step 101, described AC/DC signal selecting circuit is believed to described front end analogue under the control of described controller
Number carry out coupling processing；
In implementing, described AC/DC signal selecting circuit is under the control of described controller to described front end mould
Intend the step that signal carries out coupling processing, including：
Described controller sends opening of the relay RE1 of a level signal described AC/DC signal selecting circuit of control
Close；
During described relay RE1 closure, described AC/DC signal selecting circuit is in direct-current coupling mode and using straight
Stream coupled modes carry out coupling processing to described front end analogue signal；
When described relay RE1 opens, described AC/DC signal selecting circuit is in AC coupled mode and using friendship
Stream coupled modes carry out coupling processing to described front end analogue signal.
Step 102, the front end analogue signal through the coupling of described AC/DC signal selecting circuit enters described signal attenuation
Carry out signal attenuation process and compensation deals with compensation circuit, the deamplification obtaining high internal resistance is to meet described voltage follow electricity
Road is for the requirement of input voltage；
In implementing, this step includes：
When the attenuation multiple default setting of described signal attenuation and compensation circuit is 2 times of decay；
Described entering signal decay is N with the front end analogue signal of compensation circuit, when this front end analogue signal N is peak-to-peak value
During signal less than 10V, give tacit consent to its 2 times of decay, the front end analogue signal after attenuation processing is N* (R2+R3+R4)/(R1+R2+
R3+R4)=1/2*N；When this front end analogue signal N is signal between 10V～400V for the peak-to-peak value, give tacit consent to its decay 50
Times, the front end analogue signal after attenuation processing is N*R4/R1+R2+R3+R4=1/50*N.
Step 103, the deamplification of described high internal resistance inputs to described voltage follower circuit, and this voltage follower circuit is to defeated
The deamplification of the high internal resistance entering carries out impedance conversion, and the front end analogue signal exporting little internal resistance is to described programmable amplifying circuit；
Step 104, described programmable amplifying circuit obtains one to inputting after front end analogue signal therein is amplified processing
Bipolar signal；
In implementing, this step includes：
Produce a voltage signal by 12 D/A converter of a two-way；
This voltage signal is inputted to the input in described programmable amplifying circuit, with control this programmable amplifying circuit with
The corresponding amplification of this voltage signal is amplified process to described front end analogue signal and obtains bipolar signal.
Step 105, described voltage movement circuit by described bipolar signal be converted into after unipolar signal exporting to institute
The multichannel AD converter stating the connection of wideband data acquisition system front end analogue signal processing carries out sampling processing.
In implementing, this step includes：
Produce another voltage signal by described 12 D/A converter of two-way；
This voltage signal is inputted to the input in described voltage movement circuit, to control this voltage movement circuit by institute
State bipolar signal and be converted into unipolar signal.
Describe the wideband data acquisition system front end analogue signal regulating device that the present invention provides below with reference to Fig. 2 in detail
The method carrying out signal condition realizes process.
First, front end analogue signal is connected to wideband data acquisition system front end analogue signal condition dress by BNC connector
In putting, controller (concretely FPGA or arm processor) sends a level signal by connection end CH1_ACDC and controls
The folding of relay RE1.When relay RE1 closes, then select direct-current coupling mode；When relay RE1 opens, then select
AC coupled mode.
Subsequently, the front end analogue signal entering signal decay of coupled process and compensation circuit, the front end analogue letter of entrance
Number acquiescence decay 2 times, note signal be N, then through overdamping with compensate network signal be N* (R2+R3+R4)/(R1+R2+R3+
R4)=1/2*N.
When the signal that peak-to-peak value is less than 10V enters, according to 2 times of the decay of acquiescence；When peak-to-peak value is in 10V～400V
Between signal then decay about 50 times when coming in, N*R4/R1+R2+R3+R4=1/50*N.So through the front end of attenuation processing
Analogue signal then can meet the requirement (concrete amplitude is that -5V arrives+5V) for input voltage for the next stage voltage follower circuit.
Simultaneously because the attenuation of signal makes the front end analogue signal inputting at a high speed, the such as edge of square-wave signal becomes
Slow, so R1, R2, R3 are done shunt capacitance with compensation circuit using the method compensating by signal attenuation processing, simultaneously in order to reach
Optimized effect, electric capacity by the way of fixing capacitance electric capacity is in parallel with tunable capacitor, the such as C2 of in figure and C2*, C3 and
C3*, the edge of so convenient adjustment signal, until allow the change of square-wave signal edge precipitous till.
So, the front end analogue signal of high speed, after decay with compensation network, the loss of front end analogue signal is dropped to
Minimum.Enter voltage follower circuit through overdamping with the front end analogue signal compensating network.This voltage follower circuit is by voltage
Follower AD8065 forms.Voltage follower AD8065 is a kind of high accuracy, at a high speed, the track to track operation amplifier of high input impedance
Device, carries out impedance conversion to the deamplification of the high internal resistance of input, the signal internal resistance very little through its No. 1 pin output, Ran Houjin
Enter to programmable amplifying circuit.
The essential core device of programmable amplifying circuit is AD603, inputs a voltage signal in its connection end CH1_VAMP, can
With the amplification of control input signal, wherein voltage signal is to be produced by 12 D/A converter TLV5618 of a two-way, can
So that voltage signal is carried out with the control of accurate, trickle stepping, thus the amplification to input signal for precise control AD603.Tool
During body is realized, amplification is set according to actual needs.
D/A converter TLV5618 is connected with controller by SPI interface, makes, inside controller, the voltage needing to control
The form of one look-up table exports to AD converter in order to set AD output voltage.
It should be noted that the signal through programming amplifying is bipolar signal, because most AD converter needs
Want unipolar signal it is therefore desirable to one DC level signal of superposition, in order to be converted into unipolar signal, bipolar signal is turned
The function of changing unipolar signal into is completed by voltage movement circuit.
Input a voltage signal in the connection end CH1_VPOS of voltage movement circuit, it is possible to achieve bipolar signal and one pole
The conversion of property signal.This voltage signal is equally realized by two-way D/A converter TLV5618, realizes principle and controls programming amplifying together
The method of device.
After bipolar signal is converted to unipolar signal by voltage movement circuit, complete to front end analogue signal condition
Finish.Nurse one's health the signal finishing to export by AD_CH1 end, supply multichannel AD sample circuit (in figure marks) is sampled
Process.
Compared with prior art, the wideband data acquisition system front end analogue signal regulating device of the present invention and method have
Following beneficial effect：
Wideband data acquisition system front end analogue signal regulating device and method that the present invention provides, with processing frequency can be
Direct current is the 0 front end analogue signal arriving 200V to 100Mhz, amplitude, is to carry out sampling to front end analogue signal to provide guarantee,
Precision that front end analogue signal is sampled and accuracy are greatly improved.
Above content is to further describe it is impossible to assert with reference to specific preferred implementation is made for the present invention
Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of present inventive concept, some simple deduction or replace can also be made, all should be considered as belonging to the present invention's
Protection domain.
Claims (9)
1. a kind of processing meanss of wideband data acquisition system front end analogue signal are it is characterised in that include：AC/DC is believed
Number selection circuit, signal attenuation and compensation circuit, voltage follower circuit, programmable amplifying circuit, voltage movement circuit and control
Device；
The outfan of described AC/DC signal selecting circuit is connected with compensation circuit with described signal attenuation；Described signal declines
Subtract and be connected with described voltage follower circuit with the outfan of compensation circuit；The outfan of described voltage follower circuit is program control with described
Amplifying circuit connects；The outfan of described programmable amplifying circuit is connected with described voltage movement circuit；
Described voltage movement circuit the processing meanss of this wideband data acquisition system front end analogue signal are processed after front end mould
Intend signal output to connected multichannel AD converter and carry out sampling processing;
The outfan of described controller and described AC/DC signal selecting circuit, signal attenuation and compensation circuit, voltage follow
Circuit, programmable amplifying circuit, voltage movement circuit connect, and control its operation by output control signal.
2. the processing meanss of wideband data acquisition system front end analogue signal as claimed in claim 1 are it is characterised in that described
AC/DC signal selecting circuit is made up of with relay RE1 electric capacity C1；Relay RE1 has 1-4 pin, and wherein No. 1 is drawn
Foot is control end, and this No. 1 pin is connected with the I/O port of described controller by a resistance R13, and junction point is CH1_ACDC.
3. the processing meanss of wideband data acquisition system front end analogue signal as claimed in claim 1 are it is characterised in that described
Signal attenuation and compensation circuit are by fixed capacity C2 in parallel and tunable capacitor C2*, and fixed capacity C3 of parallel connection and adjustable
Electric capacity C3*, and resistance R1, R2, R3, R4 and relay TQ2-5V composition, described relay TQ2-5V has No. 1-10 and draws
Foot, wherein No. 10 pins are control end, are connected with described controller by PNP type triode Q1, and junction point is CH1_
ATT.
4. the processing meanss of wideband data acquisition system front end analogue signal as claimed in claim 1 are it is characterised in that described
Voltage follower circuit using high accuracy, at a high speed, the track to track operational amplifier U5AD8065 of high input impedance；
Described programmable amplifying circuit is using referring to programmable amplifier AD603；
Described voltage movement circuit is made up of with the capacitance resistance ware being connected it operational amplifier U7.
5. a kind of wideband data acquisition system front end analogue signal condition method, it is based on any one of Claims 1-4
Wideband data acquisition system front end analogue signal processing meanss realize it is characterised in that include：
Receiving front-end analogue signal；
Described AC/DC signal selecting circuit is carried out at coupling to described front end analogue signal under the control of described controller
Reason；
Front end analogue signal through the coupling of described AC/DC signal selecting circuit is entered described signal attenuation and is entered with compensation circuit
Row signal attenuation process and compensation deals, the deamplification obtaining high internal resistance is to meet described voltage follower circuit for input electricity
The requirement of pressure；
The deamplification of described high internal resistance inputs to described voltage follower circuit, and this voltage follower circuit is to the high internal resistance inputting
Deamplification carries out impedance conversion, and the front end analogue signal exporting little internal resistance is to described programmable amplifying circuit；
Described programmable amplifying circuit obtains bipolar signal to inputting after front end analogue signal therein is amplified processing；
Described bipolar signal is converted into after unipolar signal exporting and adopts to described wideband data by described voltage movement circuit
The multichannel AD converter that collecting system front end analogue signal processing connects carries out sampling processing.
6. wideband data acquisition system front end analogue signal condition method as claimed in claim 5 is it is characterised in that described straight
The step that stream/AC signal selection circuit carries out coupling processing to described front end analogue signal under the control of described controller,
Including：
Described controller sends the folding that a level signal controls the relay RE1 of described AC/DC signal selecting circuit；
During described relay RE1 closure, described AC/DC signal selecting circuit is in direct-current coupling mode and adopts direct current coupling
Conjunction mode carries out coupling processing to described front end analogue signal；
When described relay RE1 opens, described AC/DC signal selecting circuit is in AC coupled mode and using exchange coupling
Conjunction mode carries out coupling processing to described front end analogue signal.
7. wideband data acquisition system front end analogue signal condition method as claimed in claim 5 is it is characterised in that through institute
The front end analogue signal stating the coupling of AC/DC signal selecting circuit enters described signal attenuation and carries out signal with compensation circuit and decline
The step subtracting process includes：
When the attenuation multiple default setting of described signal attenuation and compensation circuit is 2 times of decay；
Described entering signal decay is N with the front end analogue signal of compensation circuit, when this front end analogue signal N is less than for peak-to-peak value
During the signal of 10V, give tacit consent to its 2 times of decay, the front end analogue signal after attenuation processing is N* (R2+R3+R4)/(R1+R2+R3+
R4)=1/2*N；When this front end analogue signal N is signal between 10V～400V for the peak-to-peak value, gives tacit consent to its 50 times of decay, decline
Subtracting the front end analogue signal after process is N*R4/R1+R2+R3+R4=1/50*N, and wherein, R1, R2, R3, R4 in formula are respectively
Resistance for resistance R1, R2, R3, R4.
8. wideband data acquisition system front end analogue signal condition method as claimed in claim 5 is it is characterised in that described journey
Control amplifying circuit obtains bipolar signal step after input front end analogue signal therein is amplified processing, including：
Produce a voltage signal by 12 D/A converter of a two-way；
This voltage signal is inputted to the input in described programmable amplifying circuit, with control this programmable amplifying circuit with this electricity
The pressure corresponding amplification of signal is amplified process to described front end analogue signal and obtains bipolar signal.
9. wideband data acquisition system front end analogue signal condition method as claimed in claim 8 is it is characterised in that described electricity
Put down and move the step that described bipolar signal is converted into unipolar signal by circuit, including：
Produce another voltage signal by described 12 D/A converter of two-way；
This voltage signal is inputted to the input in described voltage movement circuit, to control this voltage movement circuit described double
Polar signal is converted into unipolar signal.
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| CN114600050A (en) * | 2020-09-30 | 2022-06-07 | 焦旭 | Multi-signal parallel acquisition circuit, electronic device and body characteristic signal acquisition instrument |
| CN115225079A (en) | 2021-04-21 | 2022-10-21 | 集益威半导体(上海)有限公司 | Circuit for improving linearity and channel compensation of PAM4 analog receiving front end |
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| "一种高精度数据采集系统模拟信号调理电路的设计";陈淑芳;《长沙铁道学院学报（社会科学版）》;20080315;第9卷(第1期);第215-217页 * |
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| CN103825617A (en) | 2014-05-28 |
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