CN113114144B - Circuit for correcting input offset voltage in quantum measurement and control system - Google Patents
Circuit for correcting input offset voltage in quantum measurement and control system Download PDFInfo
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- CN113114144B CN113114144B CN202110511946.4A CN202110511946A CN113114144B CN 113114144 B CN113114144 B CN 113114144B CN 202110511946 A CN202110511946 A CN 202110511946A CN 113114144 B CN113114144 B CN 113114144B
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- operational amplifier
- offset voltage
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
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Abstract
A circuit for correcting input offset voltage in a quantum measurement and control system is characterized in that a second output end of a single-pole double-throw switch is communicated with an input end, a non-inverting input end of an operational amplifier is grounded, an inverting input end of the operational amplifier is connected to an adjustable power supply, the output voltage of the operational amplifier is converted by an analog-to-digital converter and then input and measured, the voltage value of the adjustable power supply is adjusted until the output voltage value of the operational amplifier is 0, the output voltage of the adjustable power supply is just equal to the offset voltage of the operational amplifier, the offset voltage correction is completed, then the connection with a quantum measurement and control board card can be realized after the first output end o of the single-pole double-throw switch is connected with the input end, the precision of the quantum measurement and control board card is improved, and the purpose of eliminating the offset voltage output by the operational amplifier is achieved.
Description
Technical Field
The invention relates to a circuit for correcting input offset voltage in a quantum measurement and control system.
Background
In a differential amplifier or a differential input operational amplifier, in order to obtain a constant zero voltage output at an output terminal, a difference between dc voltages applied to two input terminals is required. This parameter characterizes the degree of matching of the present stage of the differential amplifier. When equal input voltages are applied to the two input terminals of the differential amplifier, the differential output voltage is referred to as an output offset voltage. The existence of offset voltage can influence the precision of quantum measurement and control integrated circuit board, therefore need eliminate offset voltage.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a circuit for correcting offset voltage through an adjustable power supply.
The technical scheme adopted by the invention for overcoming the technical problems is as follows:
a circuit for correcting input offset voltage in a quantum measurement and control system comprises:
the non-inverting input end of the operational amplifier is connected to one end of a resistor V, the other end of the resistor V is respectively grounded and connected to the input end of a single-pole double-throw switch, the first output end of the single-pole double-throw switch is connected to the input end of the quantum measurement and control board, the second output end of the single-pole double-throw switch is grounded, the inverting input end of the operational amplifier is connected to one end of an adjustable power supply through a resistor IX, and the other end of the adjustable power supply is grounded;
the input pin of the analog-to-digital converter is connected with the output end of the operational amplifier through a resistor I, and the input plus pin of the analog-to-digital converter is connected with the output end of the operational amplifier through a resistor II;
one end of the resistor III is connected to the non-inverting input end of the operational amplifier, and the other end of the resistor III is connected to the output end of the operational amplifier;
and one end of the resistor IV is connected to the non-inverting input end of the operational amplifier, and the other end of the resistor IV is connected to the output end of the operational amplifier.
Preferably, the operational amplifier is an LMH6552 type operational amplifier.
Further, a resistor VIII is connected between the resistor V and the ground, and a resistor VII is connected between the resistor V and the input end of the single-pole double-throw switch.
Further, a resistor VI is connected between the resistor IX and the adjustable power supply.
The invention has the beneficial effects that: the second output end of the single-pole double-throw switch is communicated with the input end, the non-inverting input end of the operational amplifier is grounded at the moment, the inverting input end of the operational amplifier is connected to the adjustable power supply, the output voltage of the operational amplifier is converted through the analog-to-digital converter and then input into the measurement, the voltage value of the adjustable power supply is adjusted until the output voltage value of the operational amplifier is 0, the output voltage of the adjustable power supply is just equal to the offset voltage of the operational amplifier at the moment, the offset voltage is corrected, then the connection with the quantum measurement and control board card can be realized after the first output end of the single-pole double-throw switch is connected with the input end, the precision of the quantum measurement and control board card is improved, and the purpose of eliminating the offset voltage output by the operational amplifier is achieved.
Drawings
FIG. 1 is a circuit block diagram of the present invention;
in the figure, 1, an operational amplifier 2, an analog-to-digital converter 3, a resistor I4, a resistor II 5, a resistor III 6, a resistor IV 7, a resistor V8, a resistor VI 9, an adjustable power supply 10, a resistor VII 11, a resistor VIII 12, a single-pole double-throw switch 13 and a resistor IX are shown.
Detailed Description
The invention is further described below with reference to fig. 1.
A circuit for correcting input offset voltage in a quantum measurement and control system comprises: the non-inverting input end of the operational amplifier 1 is connected to one end of a resistor V7, the other end of the resistor V7 is grounded and connected to the input end of a single-pole double-throw switch 12 respectively, the first output end of the single-pole double-throw switch 12 is connected to the input end of the quantum measurement and control board, the second output end of the single-pole double-throw switch is grounded, the inverting input end of the operational amplifier 1 is connected to one end of an adjustable power supply 9 through a resistor IX 13, and the other end of the adjustable power supply 9 is grounded; the analog-to-digital converter 2 is characterized IN that an IN-pin is connected to the output end of the operational amplifier 1 through a resistor I3, and an IN + pin is connected to the output end of the operational amplifier 1 through a resistor II 4; a resistor III 5, one end of which is connected to the non-inverting input end of the operational amplifier 1 and the other end of which is connected to the output end of the operational amplifier 1; and a resistor iv 6 having one end connected to the non-inverting input terminal of the operational amplifier 1 and the other end connected to the output terminal of the operational amplifier 1. The second output end of the single-pole double-throw switch 12 is communicated with the input end, the non-inverting input end of the operational amplifier 1 is grounded at the moment, the inverting input end of the operational amplifier 1 is connected to the adjustable power supply 9, the output voltage of the operational amplifier 1 is converted by the analog-to-digital converter 2 and then input and measured, the voltage value of the adjustable power supply 9 is adjusted until the output voltage value of the operational amplifier 1 is 0, the output voltage of the adjustable power supply 9 is just equal to the offset voltage of the operational amplifier 1 at the moment, the offset voltage is corrected, then the connection with the quantum measurement and control board card can be realized after the first output end of the single-pole double-throw switch 12 is connected with the input end, the precision of the quantum measurement and control board card is improved, and the purpose of eliminating the offset voltage output by the operational amplifier 1 is achieved. The resistor III 5 and the resistor IV 6 are used for determining the amplification factor of the operational amplifier 1, the resistor V7 and the resistor IX 13 are also used for determining the amplification factor of the operational amplifier 1, and the resistor I3 and the resistor II 4 are both used for achieving the function of line impedance matching.
Preferably, the operational amplifier 1 is an LMH6552 type operational amplifier.
A resistor VIII 11 can be connected between the resistor V7 and the ground, and a resistor VII 10 can be connected between the resistor V7 and the input end of the single-pole double-throw switch 12. And the resistor VIII 11 and the resistor VII 10 both have the function of line impedance matching.
And a resistor VI 8 can be connected between the resistor IX 13 and the adjustable power supply 9. Resistor vi 8 functions as a line impedance match.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A circuit for correcting input offset voltage in a quantum measurement and control system is characterized by comprising:
the non-inverting input end of the operational amplifier (1) is connected to one end of a resistor V (7), the other end of the resistor V (7) is grounded and connected to the input end of a single-pole double-throw switch (12), the first output end of the single-pole double-throw switch (12) is connected to the input end of the quantum measurement and control board, the second output end of the single-pole double-throw switch is grounded, the inverting input end of the operational amplifier (1) is connected to one end of an adjustable power supply (9) through a resistor IX (13), and the other end of the adjustable power supply (9) is grounded;
the analog-to-digital converter (2) is connected with the output end of the operational amplifier (1) through a resistor I (3) at the IN-pin and connected with the output end of the operational amplifier (1) through a resistor II (4) at the IN + pin;
one end of the resistor III (5) is connected to the non-inverting input end of the operational amplifier (1), and the other end of the resistor III is connected to the output end of the operational amplifier (1);
and one end of the resistor IV (6) is connected to the non-inverting input end of the operational amplifier (1), and the other end of the resistor IV is connected to the output end of the operational amplifier (1).
2. The input offset voltage correction circuit in the quantum measurement and control system according to claim 1, characterized in that: the operational amplifier (1) is an LMH6552 type operational amplifier.
3. The input offset voltage correction circuit in the quantum measurement and control system according to claim 1, characterized in that: and a resistor VIII (11) is connected between the resistor V (7) and the ground, and a resistor VII (10) is connected between the resistor V (7) and the input end of the single-pole double-throw switch (12).
4. The input offset voltage correction circuit in the quantum measurement and control system according to claim 1, characterized in that: and a resistor VI (8) is connected between the resistor IX (13) and the adjustable power supply (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110511946.4A CN113114144B (en) | 2021-05-11 | 2021-05-11 | Circuit for correcting input offset voltage in quantum measurement and control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110511946.4A CN113114144B (en) | 2021-05-11 | 2021-05-11 | Circuit for correcting input offset voltage in quantum measurement and control system |
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| CN113114144A CN113114144A (en) | 2021-07-13 |
| CN113114144B true CN113114144B (en) | 2022-05-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114062900A (en) * | 2021-12-13 | 2022-02-18 | 中国电子科技集团公司第四十七研究所 | Operational amplifier circuit offset voltage testing method |
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| JP2002374131A (en) * | 2001-06-14 | 2002-12-26 | Seiko Instruments Inc | Automatic correction circuit of operational amplifier offset voltage |
| CN101277112A (en) * | 2008-05-15 | 2008-10-01 | 复旦大学 | Low-power consumption assembly line a/d converter by sharing operation amplifier |
| CN101424533A (en) * | 2008-08-29 | 2009-05-06 | 北京大学 | Detuning capacitor compensation process and circuit in MEMS gyroscope capacitor read-out circuit |
| CN106788351A (en) * | 2016-12-23 | 2017-05-31 | 长沙景嘉微电子股份有限公司 | A kind of rail-to-rail reference voltage comparator tested with offset voltage and corrected |
| CN108494371A (en) * | 2018-07-04 | 2018-09-04 | 珠海市微半导体有限公司 | A kind of automatic calibration circuit of amplifier input offset voltage and bearing calibration |
| CN208299759U (en) * | 2018-07-04 | 2018-12-28 | 珠海市一微半导体有限公司 | A kind of automatic calibration circuit of amplifier input offset voltage |
| CN111416582A (en) * | 2020-04-08 | 2020-07-14 | 上海必阳科技有限公司 | Self-calibration circuit for input offset voltage of operational amplifier integrated circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017123534A (en) * | 2016-01-06 | 2017-07-13 | ルネサスエレクトロニクス株式会社 | Semiconductor device |
| CN108459647B (en) * | 2017-02-22 | 2021-07-30 | 普源精电科技股份有限公司 | Calibration offset circuit and method for electronic load constant current control loop |
| CN211927125U (en) * | 2020-08-25 | 2020-11-13 | 深圳市汇顶科技股份有限公司 | Temperature measurement circuit, temperature measurement and light measurement circuit, chip, module and electronic equipment |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002374131A (en) * | 2001-06-14 | 2002-12-26 | Seiko Instruments Inc | Automatic correction circuit of operational amplifier offset voltage |
| CN101277112A (en) * | 2008-05-15 | 2008-10-01 | 复旦大学 | Low-power consumption assembly line a/d converter by sharing operation amplifier |
| CN101424533A (en) * | 2008-08-29 | 2009-05-06 | 北京大学 | Detuning capacitor compensation process and circuit in MEMS gyroscope capacitor read-out circuit |
| CN106788351A (en) * | 2016-12-23 | 2017-05-31 | 长沙景嘉微电子股份有限公司 | A kind of rail-to-rail reference voltage comparator tested with offset voltage and corrected |
| CN108494371A (en) * | 2018-07-04 | 2018-09-04 | 珠海市微半导体有限公司 | A kind of automatic calibration circuit of amplifier input offset voltage and bearing calibration |
| CN208299759U (en) * | 2018-07-04 | 2018-12-28 | 珠海市一微半导体有限公司 | A kind of automatic calibration circuit of amplifier input offset voltage |
| CN111416582A (en) * | 2020-04-08 | 2020-07-14 | 上海必阳科技有限公司 | Self-calibration circuit for input offset voltage of operational amplifier integrated circuit |
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