CN106411321A - Optimized analog signal conditioning circuit and working method thereof - Google Patents
Optimized analog signal conditioning circuit and working method thereof Download PDFInfo
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- CN106411321A CN106411321A CN201610883131.8A CN201610883131A CN106411321A CN 106411321 A CN106411321 A CN 106411321A CN 201610883131 A CN201610883131 A CN 201610883131A CN 106411321 A CN106411321 A CN 106411321A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 238000005457 optimization Methods 0.000 claims description 25
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 16
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/46—One-port networks
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/129—Means for adapting the input signal to the range the converter can handle, e.g. limiting, pre-scaling ; Out-of-range indication
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Abstract
The invention aims at solving the problem that according to an existing analog signal conditioning circuit, the employed devices are many, a circuit structure is complex, and the circuit design flexibility for the unipolarity/bipolarity difference of an A/D converter is relatively poor, and provides an optimized analog signal conditioning circuit and a working method thereof. The conditioning circuit comprises a filtering module composed of an active second-order low-pass filtering circuit; and an amplifier bias module composed of a bias circuit or a bias selection circuit and an amplifier circuit. An input end of the bias circuit is connected with an output end of the active second-order low-pass filtering circuit; the output end of the bias circuit is connected with the input end of the amplifier circuit; and the output end of the amplifier circuit outputs a conditioned analog signal. According to the circuit and the method, a circuit structure is optimized, the number of devices is reduced, the transmission distance is shortened, a fault rate is reduced, and the space and cost are reduced. Moreover, a working mode can be switched flexibly for the unipolarity/bipolarity of the A/D converter, the repeated design of the conditioning circuit is avoided, and the time cost is saved.
Description
Technical field
The present invention relates to circuit design and its work correlative technology field, specifically, it is related to a kind of simulation letter of optimization
Number modulate circuit and its method of work.
Background technology
At present, modulate circuit is the indispensable link of analogue signal acquisition circuit in power control system, and analog signal needs
Change into suitable electric parameters and deliver to the A/D converter that sampling A/D chip or DSP carry after conditioning, conventional analog signal is adjusted
Reason circuit is as shown in figure 1, formed by following module, amplification module, biasing module and 4 parts of filtration module.Permissible from Fig. 1
Find out, the device that existing analog signal conditioner circuit has employing is more there is circuit structure complexity, signal transmission distance
Long, area occupied is big, and fault rate is high, the problems such as less economical.
Additionally, A/D converter have unipolarity and bipolarity point, conventional analog signal conditioner circuit is more suitable for one pole
The A/D converter of property（The A/D converter that such as DSP carries）, for ambipolar A/D converter, actually do not need
It is adaptable to the modulate circuit of unipolar A/D converter, other circuit structures turn biasing circuit link for ambipolar A/D
It is redundancy for parallel operation.Therefore, in actual applications, often due to the mono-/bis-different polarities of A/D converter, cause again
Design modulate circuit, increased time cost, flexibility is poor.
Content of the invention
The present invention is more in order to solve the device that existing analog signal conditioner circuit presence adopts, and circuit structure is complicated,
Signal transmission distance is long, and area occupied is big, and fault rate is high, the problems such as less economical, provides a kind of analog signal conditioner of optimization
Circuit, passes through the selection of more reasonably circuit structure design and mode of operation further, solves due to the mono-/bis-of A/D converter
Different polarities, cause to redesign modulate circuit, increased time cost, the poor problem of flexibility.
The technical problem solving required for the present invention, can be achieved through the following technical solutions：
A first aspect of the present invention, a kind of analog signal conditioner circuit of optimization is it is characterised in that include：
Filtration module, described filtration module is active second-order low-pass filter circuit, the input input of active second-order low-pass filter
Primary simulation signal；
Amplify biasing module, described amplification biasing module includes, biasing circuit and amplifying circuit, the input of described biasing circuit
Connect the output end of active second-order low-pass filter, the output end of biasing circuit connects the input of amplifying circuit, amplifying circuit
Output end output is through the analog signal of conditioning.
In the present invention, described active second-order low-pass filter circuit, including the first operational amplifier U1, first resistor R1,
Two resistance R2, the first electric capacity C1 and the second electric capacity C2, the two ends of described second resistance R2 connect first resistor R1 and first respectively
The in-phase input end of operational amplifier U1, the other end of first resistor R1 is the input of active second-order low-pass filter circuit；The
One end of one electric capacity C1 connects the tie point between first resistor R1 and second resistance R2, and the other end connects the first operational amplifier
The reverse input end of U1；One end of second electric capacity C2 is connected with the in-phase input end of the first operational amplifier U1, and the other end is grounded；
The inverting input of the first operational amplifier U1 is connected with output end, and the output end of the first operational amplifier U1 is that active second order is low
Bandpass filter circuit output end.
In the present invention, described biasing circuit includes 3rd resistor R3, the 4th resistance R4 and bias voltage Vref, and the described 3rd
One end of resistance R3 is the input of biasing circuit, and the other end is the output end of biasing circuit；One end of 4th resistance R4 connects
The output end of biasing circuit, the other end connects bias voltage Vref.
Described amplifying circuit is in-phase amplification circuit, including the 5th resistance R5, the 6th resistance R6 and the second operational amplifier
U2, the output end of described biasing circuit connects the in-phase input end of the second operational amplifier U2；One end of described 5th resistance R5
Connect the inverting input of the second operational amplifier U2, the other end is grounded；The two ends of described 6th resistance R6 connect second respectively
The inverting input of operational amplifier U2 and output end；The output end of the second operational amplifier U2 is the output end of amplifying circuit.
A second aspect of the present invention, another kind of analog signal conditioner circuit optimizing is it is characterised in that include：
Filtration module, described filtration module is active second-order low-pass filter circuit, the input input of active second-order low-pass filter
Primary simulation signal；
Amplify biasing module, described amplification biasing module includes, bias selection circuit and amplifying circuit, described biasing selection circuit
It is provided with biasing selecting switch, described biasing selecting switch controls whether bias voltage accesses biasing selection circuit, described biasing choosing
The input selecting circuit connects the output end of active second-order low-pass filter, and the output end of biasing selection circuit connects amplifying circuit
Input, the output end output of amplifying circuit is through the analog signal nursed one's health.
In the present invention, described active second-order low-pass filter circuit, including the first operational amplifier U1, first resistor R1,
Two resistance R2, the first electric capacity C1 and the second electric capacity C2, the two ends of described second resistance R2 connect first resistor R1 and first respectively
The in-phase input end of operational amplifier U1, the other end of first resistor R1 is the input of active second-order low-pass filter circuit；The
One end of one electric capacity C1 connects the tie point between first resistor R1 and second resistance R2, and the other end connects the first operational amplifier
The reverse input end of U1；One end of second electric capacity C2 is connected with the in-phase input end of the first operational amplifier U1, and the other end is grounded；
The inverting input of the first operational amplifier U1 is connected with output end, and the output end of the first operational amplifier U1 is that active second order is low
Bandpass filter circuit output end.
In the present invention, described biasing selection circuit includes 3rd resistor R3, the 4th resistance R4, biasing selecting switch and biasing
Voltage Vref, one end of described 3rd resistor R3 is the input of biasing circuit, and the other end is the output end of biasing circuit；Biasing
One end of selecting switch connects the output end of biasing circuit, and the other end of biasing selecting switch connects the 4th resistance R4, the 4th electricity
The other end of resistance R4 connects bias voltage Vref.
Described biasing selecting switch is bouncing pilotage J, and two pins of bouncing pilotage J connect the output end and the 4th of biasing circuit respectively
Resistance R4.
Described amplifying circuit is in-phase amplification circuit, including the 5th resistance R5, the 6th resistance R6 and the second operational amplifier
U2, the output end of described biasing circuit connects the in-phase input end of the second operational amplifier U2；One end of described 5th resistance R5
Connect the inverting input of the second operational amplifier U2, the other end is grounded；The two ends of described 6th resistance R6 connect second respectively
The inverting input of operational amplifier U2 and output end；The output end of the second operational amplifier U2 is the output end of amplifying circuit.
A third aspect of the present invention, a kind of method of work of the analog signal conditioner circuit of optimization, through the simulation of conditioning
Signal input A/D converter is it is characterised in that include：
1）Judge that the analog signal through conditioning intends the polarity of the A/D converter of input；
2）When the A/D converter intending input is unipolarity, accesses bias voltage by biasing selecting switch, work as A/D converter
During for bipolarity, do not access bias voltage by biasing selecting switch.
The analog signal conditioner circuit of the optimization of the present invention and its method of work, abandoned in prior art modulate circuit by
Follow module, the defect of amplification module, biasing module and 4 complicated part compositions of filtration module, optimize circuit structure, reduce
The quantity of device, shorten transmission range, reduce fault rate, greatly save space and cost；In addition the simulation letter optimizing
The A/D converter that number modulate circuit can be directed to mono-/bis-polarity be operated pattern and flexibly switch, it is to avoid the weight of modulate circuit
Multiple design, has saved time cost.
Brief description
To further illustrate the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the electrical block diagram of existing analog signal conditioner circuit.
Fig. 2 is the electrical block diagram of analog signal conditioner the first embodiment of circuit of the present invention
Fig. 3 is the electrical block diagram of analog signal conditioner circuit second embodiment of the present invention.
Fig. 4 is applied to the equivalent circuit structure schematic diagram of unipolarity A/D converter for Fig. 3 illustrated embodiment.
Fig. 5 is applied to the equivalent circuit structure schematic diagram of bipolarity A/D converter for Fig. 3 illustrated embodiment.
Specific embodiment
In order that the technological means of the present invention, creation characteristic, reached purpose and effect are easy to understand, with reference to tool
Body illustrates, and the present invention is expanded on further.
Idea of the invention is that, by the circuit structure of the modulate circuit to existing analog signal and dividing using scene
Analysis, finds that the device that existing analog signal conditioner circuit presence adopts is more, circuit structure is complicated, and signal transmission distance is long,
Area occupied is big, and fault rate is high, the problems such as less economical, for the mono-/bis-different polarities of A/D converter, causes to need again
Design modulate circuit, increased time cost, there is a problem of that flexibility is poor, provide a kind of simulation of optimization by the present invention
Signal conditioning circuit and its method of work are to solve the above problems.
Referring to Fig. 2, in the analog signal conditioner circuit of the optimization of present embodiment, including filtration module and amplification biasing mould
2 parts of block, are greatly reduced with respect to prior art module number, circuit structure is greatly simplified, initial analog signal Uin warp
Cross filtration module, then export suitable electric parameters Uout by amplifying biasing module（Analog signal through conditioning）.
In the present embodiment, filtration module adopt active second-order low-pass filter circuit, active second-order low-pass filter defeated
Enter end to be used for inputting primary simulation signal, it including the first operational amplifier U1, first resistor R1, second resistance R2,
One electric capacity C1 and the second electric capacity C2, the two ends of second resistance R2 connect the same of first resistor R1 and the first operational amplifier U1 respectively
Phase input, the other end of first resistor R1 is the input of active second-order low-pass filter circuit；One end of first electric capacity C1 is even
Connect the tie point between first resistor R1 and second resistance R2, the other end connects the reverse input end of the first operational amplifier U1；
One end of second electric capacity C2 is connected with the in-phase input end of the first operational amplifier U1, and the other end is grounded；First operational amplifier
The inverting input of U1 is connected with output end, and the output end of the first operational amplifier U1 is active second-order low-pass filter circuit output
End.
Filtration module, using using active second-order low-pass filter circuit, can filter the high frequency division in initial analog signal
Amount；In addition filtration module also has larger input impedance, and the feature of less output impedance, with conventional analog signal conditioner
The function of following module in circuit is similar to, therefore also serve as in circuit following part, plays buffering buffer action so that rear stage
Amplify biasing module more good berth.
Active second-order low-pass filter circuit output end connects amplification biasing module, specifically, amplifies biasing module and includes,
Biasing circuit and amplifying circuit, the input of biasing circuit connects the output end of active second-order low-pass filter, biasing circuit defeated
Go out the input that end connects amplifying circuit, the output end output of amplifying circuit is through the analog signal nursed one's health.
In present embodiment, biasing circuit includes 3rd resistor R3, the 4th resistance R4 and bias voltage Vref, 3rd resistor
One end of R3 is the input of biasing circuit, and the other end is the output end of biasing circuit；One end of 4th resistance R4 connects biasing
The output end of circuit, the other end connects bias voltage Vref.Amplifying circuit then adopts in-phase amplification circuit, and analog signal is carried out
In-phase proportion amplifies, and it includes the 5th resistance R5, the 6th resistance R6 and the second operational amplifier U2, and the output end of biasing circuit is even
Connect the in-phase input end of the second operational amplifier U2；One end of 5th resistance R5 connects the anti-phase input of the second operational amplifier U2
End, the other end is grounded；The two ends of the 6th resistance R6 connect inverting input and the output end of the second operational amplifier U2 respectively；The
The output end of two operational amplifier U2 is the output end of amplifying circuit, and present embodiment can also be by adjusting the 6th resistance R6 electricity
Resistance realizes the multiplication factor adjustment of analog signal, to meet the sampling range area requirement of AD sampling A/D chip or DSP.
In a specific example, the first operational amplifier U1 adopts OP735 to present embodiment, and first resistor R1 is
15.8k Ω, second resistance R2 is 15.8k Ω, the first electric capacity C1 is 10nF, and the second electric capacity C2 is 10nF；Second operational amplifier
U2 equally adopts OP735, and 3rd resistor R3 is 20 k Ω, and the 4th resistance R4 is 50 k Ω, and the 5th resistance R5 is 20 k Ω, and the 6th
Resistance R6 is 50k Ω, and bias voltage Vref is set to 2.5V.By above-mentioned setting, active in the filtration module of present embodiment
The cut-off frequency of second-order low-pass filter circuit is 1kHz, and low-frequency gain is 1, really achieves active second-order low-pass filter circuit
Input impedance is very big, the feature of output impedance very little, also possesses the function of following module；Amplifying biasing circuit in biasing module will
Analog signal raises more than zero potential, then carries out in-phase proportion amplification, meets the sampling range of AD sampling A/D chip or DSP well
Scope, optimizes circuit structure, reduces the quantity of device, shortens transmission range, reduces fault rate, greatly save space
And cost.
The analog signal conditioner circuit that present embodiment optimizes, it is single through the more preferably suitable input of analog signal of conditioning
The A/D converter of polarity, when intending inputting ambipolar A/D converter through the analog signal of conditioning, biasing circuit is actually
It is redundancy.
Referring to Fig. 3, the simulation of the analog signal conditioner circuit of the optimization of present embodiment and the optimization of aforementioned embodiments
Signal conditioning circuit is similar in basic circuit structure, equally includes filtration module and amplifies 2 parts of biasing module, and
The circuit structure of filtration module and aforesaid embodiment are identicals, and using active second-order low-pass filter circuit, it is specifically tied
Structure has been carried out describing in detail in the foregoing embodiment, is not repeated herein.
From aforementioned embodiments, present embodiment differs primarily in that amplification biasing module is different, specifically,
In the present embodiment, amplify biasing module to include, bias selection circuit and amplifying circuit, biasing selection circuit is and aforementioned reality
The main distinctive points of mode of applying, biasing selection circuit is provided with biasing selecting switch, and whether biasing selecting switch controls bias voltage
Access biasing selection circuit, the input of biasing selection circuit equally connects the output end of active second-order low-pass filter, biasing choosing
The output end selecting circuit connects the input of amplifying circuit, and the output end output of amplifying circuit is through the analog signal nursed one's health.
Biasing selection circuit includes 3rd resistor R3, the 4th resistance R4, biases selecting switch and bias voltage Vref, and the 3rd
One end of resistance R3 is the input of biasing circuit, and the other end is the output end of biasing circuit；One end of biasing selecting switch is even
Connect the output end of biasing circuit, the other end of biasing selecting switch connects the 4th resistance R4, and the other end of the 4th resistance R4 connects
Bias voltage Vref, in the present embodiment, biasing selecting switch adopts bouncing pilotage J, and two pins of bouncing pilotage J connect biasing respectively
The output end of circuit and the 4th resistance R4.
Based on above-mentioned setting, the analog signal conditioner circuit of the optimization of present embodiment, the choosing based on biasing selecting switch
Select, equivalent circuit structure can rapidly switch over to whether accessing bias voltage, through the analog signal of conditioning, permissible
It is quickly switched into and is applied to output to unipolar A/D converter and ambipolar A/D converter, and be applied to bipolarity
A/D converter when, there is not redundancy in circuit structure.
The analog signal conditioner circuit of the optimization of present embodiment operationally, first determines whether the analog signal through conditioning
Intend the polarity of the A/D converter of input, when the A/D converter intending input is unipolarity, accessed partially by biasing selecting switch
Put voltage, when A/D converter is for bipolarity, do not access bias voltage by biasing selecting switch, judge that analog signal is intended defeated
The polarity of the A/D converter entering can be realized by user or machine.
Referring to Fig. 4 and Fig. 5, when present embodiment adopts bouncing pilotage J as biasing selecting switch, if it is judged that analog signal
When the polarity of the A/D converter of plan input is unipolarity, No. 1 of bouncing pilotage J1 is connected with No. 2 pins, the analog signal of optimization is adjusted
The equivalent circuit structure of reason circuit is as shown in figure 4, bias voltage Vref is chosen to access；If it is judged that analog signal intends input
The polarity of A/D converter when being bipolarity, No. 1 of bouncing pilotage J1 and No. 2 pins are not attached to, the analog signal conditioner of optimization is electric
The equivalent circuit structure on road as shown in figure 5, bias voltage Vref is not then accessed, at this moment, modulate circuit mode of operation
Be equivalent to and isolated biasing link.By above-mentioned setting, analog signal conditioner circuit can be directed to the A/D converter of mono-/bis-polarity
The pattern that is operated flexibly switches, it is to avoid the design iterations of modulate circuit, has saved time cost.
The amplifying circuit of present embodiment and aforesaid embodiment are also identical, and amplifying circuit adopts homophase to amplify electricity
Road, including the 5th resistance R5, the 6th resistance R6 and the second operational amplifier U2, the output end of biasing circuit connects the second computing and puts
The in-phase input end of big device U2；One end of 5th resistance R5 connects the inverting input of the second operational amplifier U2, another termination
Ground；The two ends of the 6th resistance R6 connect inverting input and the output end of the second operational amplifier U2 respectively；Second operation amplifier
The output end of device U2 is the output end of amplifying circuit.
In addition, it is necessary to it is noted that the type selecting of aforementioned embodiments of the present invention each prototype part and parameter are equally applicable to this
Embodiment, aforementioned embodiments have been carried out detailed description, are not repeated herein.
Below only preferred embodiments of the present invention are described, but are not to be construed as limiting the scope of the invention.This
Invention is not only limited to above example, and its concrete structure allows to change.In a word, all guarantors in independent claims of the present invention
The various change made in the range of shield is all within the scope of the present invention.
Claims (10)
1. a kind of analog signal conditioner circuit of optimization is it is characterised in that include：
Filtration module, described filtration module is active second-order low-pass filter circuit, the input input of active second-order low-pass filter
Primary simulation signal；
Amplify biasing module, described amplification biasing module includes, biasing circuit and amplifying circuit, the input of described biasing circuit
Connect the output end of active second-order low-pass filter, the output end of biasing circuit connects the input of amplifying circuit, amplifying circuit
Output end output is through the analog signal of conditioning.
2. a kind of optimization according to claim 1 analog signal conditioner circuit it is characterised in that：Described active second order is low
Bandpass filter circuit, including the first operational amplifier U1, first resistor R1, second resistance R2, the first electric capacity C1 and the second electric capacity C2,
The two ends of described second resistance R2 connect first resistor R1 and the in-phase input end of the first operational amplifier U1, first resistor respectively
The other end of R1 is the input of active second-order low-pass filter circuit；One end of first electric capacity C1 connects first resistor R1 and second
Tie point between resistance R2, the other end connects the reverse input end of the first operational amplifier U1；One end of second electric capacity C2 with
The in-phase input end of the first operational amplifier U1 is connected, and the other end is grounded；The inverting input of the first operational amplifier U1 with defeated
Go out end to be connected, the output end of the first operational amplifier U1 is active second-order low-pass filter circuit output end.
3. a kind of optimization according to claim 1 analog signal conditioner circuit it is characterised in that：Described biasing circuit bag
Include 3rd resistor R3, the 4th resistance R4 and bias voltage Vref, one end of described 3rd resistor R3 is the input of biasing circuit,
The other end is the output end of biasing circuit；One end of 4th resistance R4 connects the output end of biasing circuit, and the other end connects biasing
Voltage Vref.
4. a kind of optimization according to claim 3 analog signal conditioner circuit it is characterised in that：Described amplifying circuit is
In-phase amplification circuit, including the 5th resistance R5, the 6th resistance R6 and the second operational amplifier U2, the output end of described biasing circuit
Connect the in-phase input end of the second operational amplifier U2；One end of described 5th resistance R5 connects the anti-of the second operational amplifier U2
Phase input, the other end is grounded；The two ends of described 6th resistance R6 connect the inverting input of the second operational amplifier U2 respectively
And output end；The output end of the second operational amplifier U2 is the output end of amplifying circuit.
5. a kind of analog signal conditioner circuit of optimization is it is characterised in that include：
Filtration module, described filtration module is active second-order low-pass filter circuit, the input input of active second-order low-pass filter
Primary simulation signal；
Amplify biasing module, described amplification biasing module includes, bias selection circuit and amplifying circuit, described biasing selection circuit
It is provided with biasing selecting switch, described biasing selecting switch controls whether bias voltage accesses biasing selection circuit, described biasing choosing
The input selecting circuit connects the output end of active second-order low-pass filter, and the output end of biasing selection circuit connects amplifying circuit
Input, the output end output of amplifying circuit is through the analog signal nursed one's health.
6. a kind of optimization according to claim 5 analog signal conditioner circuit it is characterised in that：Described active second order is low
Bandpass filter circuit, including the first operational amplifier U1, first resistor R1, second resistance R2, the first electric capacity C1 and the second electric capacity C2,
The two ends of described second resistance R2 connect first resistor R1 and the in-phase input end of the first operational amplifier U1, first resistor respectively
The other end of R1 is the input of active second-order low-pass filter circuit；One end of first electric capacity C1 connects first resistor R1 and second
Tie point between resistance R2, the other end connects the reverse input end of the first operational amplifier U1；One end of second electric capacity C2 with
The in-phase input end of the first operational amplifier U1 is connected, and the other end is grounded；The inverting input of the first operational amplifier U1 with defeated
Go out end to be connected, the output end of the first operational amplifier U1 is active second-order low-pass filter circuit output end.
7. a kind of optimization according to claim 5 analog signal conditioner circuit it is characterised in that：Described biasing selects electricity
Road includes 3rd resistor R3, the 4th resistance R4, biasing selecting switch and bias voltage Vref, and one end of described 3rd resistor R3 is
The input of biasing circuit, the other end is the output end of biasing circuit；One end of biasing selecting switch connects the defeated of biasing circuit
Go out end, the other end of biasing selecting switch connects the 4th resistance R4, and the other end of the 4th resistance R4 connects bias voltage Vref.
8. a kind of optimization according to claim 7 analog signal conditioner circuit it is characterised in that：Described biasing selection is opened
Close as bouncing pilotage J, two pins of bouncing pilotage J connect output end and the 4th resistance R4 of biasing circuit respectively.
9. a kind of optimization according to claim 7 or 8 analog signal conditioner circuit it is characterised in that：Described amplification electricity
Road is in-phase amplification circuit, including the 5th resistance R5, the 6th resistance R6 and the second operational amplifier U2, described biasing circuit defeated
Go out the in-phase input end that end connects the second operational amplifier U2；One end of described 5th resistance R5 connects the second operational amplifier U2
Inverting input, the other end be grounded；The two ends of described 6th resistance R6 connect the anti-phase defeated of the second operational amplifier U2 respectively
Enter end and output end；The output end of the second operational amplifier U2 is the output end of amplifying circuit.
10. the method for work of the analog signal conditioner circuit of a kind of optimization, using the arbitrary described optimization of claim 5 to 9
Analog signal conditioner circuit, through conditioning analog signal input a/d converter it is characterised in that include：
1）Judge that the analog signal through conditioning intends the polarity of the A/D converter of input；
2）When the A/D converter intending input is unipolarity, accesses bias voltage by biasing selecting switch, work as A/D converter
During for bipolarity, do not access bias voltage by biasing selecting switch.
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| CN109873294A (en) * | 2019-04-10 | 2019-06-11 | 西安电子科技大学 | A kind of circuit and method generating laser linear FM signal |
| CN111044159A (en) * | 2020-01-02 | 2020-04-21 | 电子科技大学 | Room-temperature terahertz focal plane array bias voltage adjusting circuit and application method thereof |
| CN111640404A (en) * | 2020-06-10 | 2020-09-08 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit and display device thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109873294A (en) * | 2019-04-10 | 2019-06-11 | 西安电子科技大学 | A kind of circuit and method generating laser linear FM signal |
| CN111044159A (en) * | 2020-01-02 | 2020-04-21 | 电子科技大学 | Room-temperature terahertz focal plane array bias voltage adjusting circuit and application method thereof |
| CN111044159B (en) * | 2020-01-02 | 2021-11-09 | 电子科技大学 | Room-temperature terahertz focal plane array bias voltage adjusting circuit and application method thereof |
| CN111640404A (en) * | 2020-06-10 | 2020-09-08 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit and display device thereof |
| CN111640404B (en) * | 2020-06-10 | 2022-06-14 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit and display device thereof |
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| Publication number | Publication date |
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| CN106411321B (en) | 2024-02-06 |
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