CN2759057Y - Circuit for reducing operational amplifier misadjustment voltage temp drift - Google Patents
Circuit for reducing operational amplifier misadjustment voltage temp drift Download PDFInfo
- Publication number
- CN2759057Y CN2759057Y CN 200420114634 CN200420114634U CN2759057Y CN 2759057 Y CN2759057 Y CN 2759057Y CN 200420114634 CN200420114634 CN 200420114634 CN 200420114634 U CN200420114634 U CN 200420114634U CN 2759057 Y CN2759057 Y CN 2759057Y
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- circuit
- temperature
- misadjustment
- operational amplifier
- offset voltage
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Abstract
The utility model provides a circuit for reducing the temperature drift of misadjustment voltage of an operational amplifier. A platinum resistor (Rt) is connected to a circuit of a zero potentiometer (W); the platinum resistor (Rt) is connected in series or connected in parallel to a plurality of combined circuits of the zero potentiometer (W). When the temperature changes, the resistance value of the platinum resistor linearly changes along with the temperature; that is to say, the zero potentiometer (W) changes; consequently, the change of the misadjustment voltage (Vos) of the operational amplifier is offset; the purpose of automatic zero setting is played. The circuit has the advantage of simple method.
Description
Technical field
The utility model relates to electronic device, particularly a kind ofly reduces the circuit that the offset voltage temperature is floated.
Background technology
There is the problem of offset voltage with temperature drift (below represent with Δ Vos/ Δ t) in operational amplifier (abbreviation amplifier) in the electronic measurements circuit, be generally 10～20 μ V/ ℃, and particularly to the amplifier of high input impedance, t is greater for Δ Vos/ Δ.
As shown in Figure 1, when amplifier A input+when being zero, amplifier output Vos promptly is an offset voltage; Potentiometer W on the adjustable side Adj of adjusting amplifier A can make Vos=0 (overregulate and will make Vos＞0, the less stress joint will make Vos＜0).But in measuring process, when variation of ambient temperature, can make offset voltage Vos ≠ 0 again, influence the accuracy of measurement result.
Summary of the invention
The utility model is in order to solve existing offset voltage with the existing technical problem of variation of ambient temperature, and provide a kind ofly reduce the circuit that the offset voltage temperature is floated.
According to above-mentioned purpose, the utility model provides a kind of circuit that the offset voltage temperature is floated that reduces, and inserts platinum resistance Rt in zero potentiometer W circuit.
Foregoing circuit, wherein platinum resistance Rt is series between zero potentiometer W and the amplifier A adjustable side Adj5.
Foregoing circuit, wherein platinum resistance Rt is series between amplifier A adjustable side Adj1 and the zero potentiometer W.
Foregoing circuit, wherein resistance R in parallel on platinum resistance Rt.
Foregoing circuit, wherein resistance R in parallel on zero potentiometer W.
The utility model is owing to having adopted above technical measures, because the resistance value of platinum resistance Rt satisfies following relation: R=R with the variation of temperature t
0+ A * t
R wherein
0Resistance value during for platinum resistance Rt zero degree; A is the temperature coefficient of platinum resistance Rt, A=3.8 when platinum resistance is Pt1000, A=0.38 when platinum resistance is Pt100.
When variations in temperature, the resistance value of platinum resistance changes with temperature linearity, and this is equivalent to zero potentiometer W in variation, thereby offsets the variation of offset voltage Vos, plays the purpose of automatic zero set.This circuit has simple, the outstanding effect advantage of method.
Description of drawings
Fig. 1 is the offset voltage zeroing circuit figure of existing amplifier.
Fig. 2 is that positive temperature drift of the present utility model is transferred voltage zeroing circuit figure.
Fig. 3 is that subzero temperature drift of the present utility model is transferred voltage zeroing circuit figure.
Fig. 4 is that the positive temperature drift of overcompensation of the present utility model is transferred voltage zeroing circuit figure.
Fig. 5 is that the positive temperature drift of undercompensation of the present utility model is transferred voltage zeroing circuit figure.
Embodiment
As shown in Figure 2, a kind of positive temperature drift is transferred voltage zeroing circuit figure.The positive temperature of offset voltage Vos is floated, and platinum resistance Rt is series between zero potentiometer W and the amplifier adjustable side Adj5, is equivalent to less stress joint zero potentiometer W, and the temperature that reduces offset voltage Vos is floated.
As shown in Figure 3, a kind of subzero temperature drift is transferred voltage zeroing circuit figure.Offset voltage Vos subzero temperature floats, and platinum resistance Rt is series between amplifier adjustable side Adj1 and the zero potentiometer W, is equivalent to overregulate zero potentiometer W, and the temperature that reduces offset voltage Vos is floated.
As shown in Figure 4, the positive temperature drift of a kind of overcompensation is transferred voltage zeroing circuit figure.The positive temperature of offset voltage Vos is floated, overcompensation, and resistance R in parallel is equivalent to reduce the resistance of platinum resistance Rt, thereby reduces the amount of influence of platinum resistance Rt on platinum resistance Rt, and the temperature that reduces offset voltage Vos is floated.
As shown in Figure 5, the positive temperature drift of a kind of undercompensation is transferred voltage zeroing circuit figure.The positive temperature of offset voltage Vos is floated, undercompensation, and resistance R in parallel on zero potentiometer W is equivalent to increase the amount of influence of platinum resistance Rt, and the temperature that reduces offset voltage Vos is floated.
For example, adopt in the circuit of OPA128 in amplifier, the variable quantity of offset voltage Vos was 0.2mV when originally ambient temperature was from 20 ℃～30 ℃ variations, and after employing sealed in the offset voltage zero adjusting circuit with Pt1000 type platinum resistance, offset voltage Vos drift value was reduced to 0.07mV.
Claims (5)
1. one kind reduces the circuit that the offset voltage temperature is floated, and it is characterized in that: insert platinum resistance (Rt) in zero potentiometer (W) circuit.
2. circuit according to claim 1 is characterized in that: wherein platinum resistance (Rt) is series between zero potentiometer (W) and amplifier (A) adjustable side (Adj5).
3. circuit according to claim 1 is characterized in that: wherein platinum resistance (Rt) is series between amplifier (A) adjustable side (Adj1) and the zero potentiometer (W).
4. circuit according to claim 1 is characterized in that: wherein go up a resistance (R) in parallel in platinum resistance (Rt).
5. circuit according to claim 1 is characterized in that: wherein go up a resistance (R) in parallel at zero potentiometer (W).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420114634 CN2759057Y (en) | 2004-12-23 | 2004-12-23 | Circuit for reducing operational amplifier misadjustment voltage temp drift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420114634 CN2759057Y (en) | 2004-12-23 | 2004-12-23 | Circuit for reducing operational amplifier misadjustment voltage temp drift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2759057Y true CN2759057Y (en) | 2006-02-15 |
Family
ID=36079193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420114634 Expired - Lifetime CN2759057Y (en) | 2004-12-23 | 2004-12-23 | Circuit for reducing operational amplifier misadjustment voltage temp drift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2759057Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063929A (en) * | 2013-01-05 | 2013-04-24 | 苏州市静电设备研究所有限责任公司 | Oil product conductivity tester system |
| CN105466460A (en) * | 2015-12-18 | 2016-04-06 | 深圳市贝沃德克生物技术研究院有限公司 | Circuit temperature drift compensation system and method of biosensor |
| CN109212448A (en) * | 2018-08-22 | 2019-01-15 | 中国科学院地质与地球物理研究所 | Auto zeroing circuit |
-
2004
- 2004-12-23 CN CN 200420114634 patent/CN2759057Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063929A (en) * | 2013-01-05 | 2013-04-24 | 苏州市静电设备研究所有限责任公司 | Oil product conductivity tester system |
| CN105466460A (en) * | 2015-12-18 | 2016-04-06 | 深圳市贝沃德克生物技术研究院有限公司 | Circuit temperature drift compensation system and method of biosensor |
| WO2017101549A1 (en) * | 2015-12-18 | 2017-06-22 | 深圳市贝沃德克生物技术研究院有限公司 | Biosensor circuit temperature drift compensation system and method |
| CN105466460B (en) * | 2015-12-18 | 2019-08-30 | 深圳市贝沃德克生物技术研究院有限公司 | The circuit temperature drift compensating system and method for biosensor |
| CN109212448A (en) * | 2018-08-22 | 2019-01-15 | 中国科学院地质与地球物理研究所 | Auto zeroing circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI LEICI CHUANGYI INSTRUMENT CO. LTD. |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20111101 Address after: 200233 No. 7, Cangwu Road, Shanghai, Xuhui District Co-patentee after: Shanghai Leici Chuangyi Instrument Co., Ltd. Patentee after: Shanghai Co., Ltd of Fine Scientific Instruments Address before: 200233 No. 168, Shanghai, Tianlin Road Patentee before: Shanghai Co., Ltd of Fine Scientific Instruments |
|
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI INESA SCIENTIFIC INSTRUMENT CO., LTD. Free format text: FORMER OWNER: SHANGHAI CO., LTD OF FINE SCIENTIFIC INSTRUMENTS Effective date: 20120606 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 200233 XUHUI, SHANGHAI TO: 201805 JIADING, SHANGHAI |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120606 Address after: 201805 Shanghai City, Anting, Miquan Road, No. 111, room 2, building 101, room Co-patentee after: Shanghai Leici Chuangyi Instrument Co., Ltd. Patentee after: INESA Scientific Instrument Co., Ltd. Address before: 200233 No. 7, Cangwu Road, Shanghai, Xuhui District Co-patentee before: Shanghai Leici Chuangyi Instrument Co., Ltd. Patentee before: Shanghai Co., Ltd of Fine Scientific Instruments |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20141223 Granted publication date: 20060215 |