CN206517373U - A kind of zeroing circuit of operational amplifier - Google Patents
A kind of zeroing circuit of operational amplifier Download PDFInfo
- Publication number
- CN206517373U CN206517373U CN201621082570.0U CN201621082570U CN206517373U CN 206517373 U CN206517373 U CN 206517373U CN 201621082570 U CN201621082570 U CN 201621082570U CN 206517373 U CN206517373 U CN 206517373U
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- Prior art keywords
- operational amplifier
- potentiometer
- utility
- zero
- model
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- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a kind of zeroing circuit of operational amplifier, the output end of operational amplifier is connected with one end of first resistor, it is connected after first resistor other end series connection second resistance with the sliding contact terminal of potentiometer, the two ends of potentiometer connect positive reference voltage and negative reference voltage respectively.The circuit can realize the input voltage of operational amplifier when being zero, and no matter the null offset of operational amplifier in itself is positively biased and is negative bias, can be by adjusting the potentiometer in zeroing circuit so that operational amplifier is output as zero.The technical solution of the utility model circuit form is practical simple, it is adaptable to which operational amplifier has the occasion of small zero drift.
Description
Technical field
The utility model belongs to analog circuit field, and in particular to the zeroing circuit of operational amplifier.
Background technology
In Analogical Electronics, the applied signal voltages of many operational amplifiers is from zero to one positive potential or from one
Scope of the individual negative potential to zero, the output voltage for also requiring that operational amplifier be also it is adjustable from zero, due to operational amplifier all
There is imbalance, when input voltage Vi is zero, its output voltage Vo is not zero, generally polarization or partially negative, thus not
It is zero that output voltage, which may be caused, and when input voltage is the small-signal near zero, the nonlinear problem of output just occurs.
The content of the invention
For Improvement requirement more than prior art, the utility model provides a kind of zeroing circuit of operational amplifier.
The zeroing circuit of operational amplifier of the present utility model, the output end of the operational amplifier and the one of first resistor
End is connected, and is connected after the other end series connection second resistance of first resistor with the sliding contact terminal of potentiometer, the two ends of potentiometer
Positive reference voltage and negative reference voltage are connect respectively.
After the technical solution of the utility model, when the input voltage Vi of operational amplifier is zero, no matter operation amplifier
What device lacked of proper care generation in itself is the potentiometer in positively biased or negative bias, zeroing circuit that can be by adjusting utility model, is made
The output voltage Vo for obtaining operational amplifier is zero, reaches the effect that output voltage is zero.
The circuit form of technical solutions of the utility model is practical simple, can conveniently realize the zeroing of operational amplifier, special
Not Shi Yongyu operational amplifier have the occasion of small zero drift, to ensure the high-precision realization of accurate amplification.
Brief description of the drawings
Fig. 1 is a kind of circuit theory diagrams of the zeroing circuit for operational amplifier that the utility model is provided.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.In addition, institute in each embodiment of the utility model disclosed below
As long as the technical characteristic being related to does not constitute conflict and can be just mutually combined each other.
As illustrated, and with reference to the operation principle of the calculation specifications zeroing circuit.When operational amplifier N1 input voltage
For 0V, at the output end V2 of operational amplifier, the current potential at this is denoted as V2+For the voltage of polarization, to make between R2 and R3
The output voltage Vo that the node of connection is drawn is 0V, then according to Ohm's law, the electric current I2 flowed through in electric R2 is：
I2=（V2+-0）/R2
=V2+/R2
Because current potential is positive at V2, and the output voltage Vo drawn to the node for making to connect between R2 and R3 is 0V,
Then according to the node law of circuit, the electric current sum at the node should be zero, so the electric current all flows to resistance by node
R3, it is assumed that voltage is defined as V at potentiometer RP2 sliding contactRP2, then the node current produced on resistance R3 voltage calculating
It is as follows, it can be obtained according to Ohm's law：
（0V- VRP2）=R3×V2+/R2
Then there is VRP2= -R3×V2+/ R2, illustrates VRP2It is a negative voltage, due to the two positive and negative benchmark of termination of potentiometer
Voltage, passes through moving left and right for potentiometer sliding contact so that voltage V at potentiometer sliding contactRP2Can be transferred to from+Vref-
Vref, due in formula VRP2= -R3×V2+In/R2, R2, R3 are fixed resistance values, and V2+Be again a very little just
Inclined current potential, so VRP2The negative bias current potential of a very little, thus can by adjust potentiometer RP2 sliding contact it is past-
Finely tune at Vref ends, it is possible to so that the output voltage Vo of the operational amplifier is 0V.
Similarly, it is past by the sliding contact for adjusting potentiometer RP2 if the output V2 of operational amplifier is the voltage born partially
Finely tune at+Vref ends, it is possible to so that the output voltage Vo of the operational amplifier is 0V.
In this embodiment, reference voltage+the Vref ,-Vref at potentiometer RP2 two ends are required using high-precision benchmark electricity
Source, resistance R3, potentiometer RP2 require that high accuracy, stability are good, so just can guarantee that the stability and standard of operational amplifier zeroing
True property.
As it will be easily appreciated by one skilled in the art that the foregoing is only preferred embodiment of the present utility model, not
To limit the utility model, all any modifications made within spirit of the present utility model and principle, equivalent substitution and change
Enter, should be included within protection domain of the present utility model.
Claims (1)
1. a kind of zeroing circuit of operational amplifier, it is characterised in that：The output end of the operational amplifier and first resistor
One end is connected, and is connected after the other end series connection second resistance of first resistor with the sliding contact terminal of potentiometer, and the two of potentiometer
End connects positive reference voltage and negative reference voltage respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621082570.0U CN206517373U (en) | 2016-09-27 | 2016-09-27 | A kind of zeroing circuit of operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621082570.0U CN206517373U (en) | 2016-09-27 | 2016-09-27 | A kind of zeroing circuit of operational amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206517373U true CN206517373U (en) | 2017-09-22 |
Family
ID=59861044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621082570.0U Expired - Fee Related CN206517373U (en) | 2016-09-27 | 2016-09-27 | A kind of zeroing circuit of operational amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206517373U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008162A (en) * | 2018-01-12 | 2018-05-08 | 东华大学 | A kind of separator of the adjustable two-wire system current sensor exported in proportion |
| CN112445260A (en) * | 2020-11-25 | 2021-03-05 | 上海城建职业学院 | Automatic zero drift adjusting system and method |
-
2016
- 2016-09-27 CN CN201621082570.0U patent/CN206517373U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008162A (en) * | 2018-01-12 | 2018-05-08 | 东华大学 | A kind of separator of the adjustable two-wire system current sensor exported in proportion |
| CN112445260A (en) * | 2020-11-25 | 2021-03-05 | 上海城建职业学院 | Automatic zero drift adjusting system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170922 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |