CN114637354A - Trimming circuit for operational amplifier circuit - Google Patents
Trimming circuit for operational amplifier circuit Download PDFInfo
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- CN114637354A CN114637354A CN202210313533.XA CN202210313533A CN114637354A CN 114637354 A CN114637354 A CN 114637354A CN 202210313533 A CN202210313533 A CN 202210313533A CN 114637354 A CN114637354 A CN 114637354A
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- 238000009966 trimming Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 11
- 238000012937 correction Methods 0.000 claims description 4
- 235000012431 wafers Nutrition 0.000 description 7
- 230000002457 bidirectional effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
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Abstract
The invention relates to a trimming circuit for an operational amplifier circuit. The trimming circuit consists of a first variable resistor, a first current source, an input terminal 1, an output terminal 1, a first limit resistor, a second variable resistor, a second current source, an input terminal 2, an output terminal 2, a second limit resistor, a constant current source and a power supply; the invention has three characteristics: firstly, the circuit has very nimble input offset voltage scope, secondly sets up two-way trimming, can realize that the two-way flexibility of operational amplifier input precision is revised. Therefore, the operational amplifier circuit can be flexibly used in practical use, and the wafer of the circuit can be tested according to practical requirements, so that the use requirements of various occasions can be met through the trimming technology.
Description
Technical Field
The invention relates to a trimming circuit for an operational amplifier circuit.
Background
An operational amplifier is one of indispensable modules in a large-scale integrated circuit. The operational amplifier can be used in various circuits facilitating integration, digital-to-analog conversion, differentiation, analog-to-digital conversion, and the like. But the models are various, and the specific use requirements are different; meanwhile, in the actual production of a qualitative operational amplifier circuit, due to processing deviation brought by the procedures of etching, injecting, film forming, cleaning and the like in the manufacturing process, different areas on the same wafer can be caused, and the actual deviation of input offset voltage and output precision parameters of the operational amplifier circuit is large.
Therefore, a trimming circuit needs to be designed, all requirements can be met through wafer level testing, and meanwhile, parameter discreteness brought by production can be avoided, so that the trouble that a customer cannot select types when using the trimming circuit is reduced.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a trimming circuit for an operational amplifier circuit, which consists of a first variable resistor, a first current source, an input terminal 1, an output terminal 1, a first limit resistor, a second variable resistor, a second current source, an input terminal 2, an output terminal 2, a second limit resistor, a constant current source and a power supply;
one end of the first variable resistor is electrically connected with one end of the first current source, and the other end of the first variable resistor is electrically connected with one end of the first limiting resistor; the other end of the first limiting resistor is electrically connected with one end of the output terminal 1 and one end of the input terminal 1 respectively; the other end of the input terminal 1 is electrically connected with a constant current source;
one end of the second variable resistor is electrically connected with one end of a second current source, and the other end of the second variable resistor is electrically connected with one end of a second limiting resistor; the other end of the second limiting resistor is electrically connected with one end of the output terminal 2 and one end of the input terminal 2 respectively; the other end of the input terminal 2 is electrically connected with a constant current source;
when the other ends of the first current source and the second current source are grounded, the other end of the constant current source is electrically connected with a power supply;
when the other ends of the first current source and the second current source are electrically connected with the power supply, the other end of the constant current source is grounded.
As a preferable technical solution, the first variable resistor changes the resistance value by a trimming technique and corrects the current value of one input terminal 1.
As a preferable technical solution, the second variable resistor changes the resistance value by a trimming technique and corrects the current value of one input terminal 2.
As a preferred technical solution, the first limiting resistor and the second limiting resistor are used for controlling and making the operating conditions of the input terminal 1 and the input terminal 2 consistent as much as possible.
As a preferred technical solution, the constant current source is used for controlling the constancy of the overall current of the operational amplifier, so that the current values of one path of the input terminal 1 and one path of the input terminal 2 can be flexibly controlled on the premise that two paths of total currents are constant by correcting the first variable resistor and the second variable resistor.
As a preferable technical solution, the first variable resistor and the second variable resistor are each formed by connecting a plurality of resistors in series, and the resistance values of the plurality of resistors are scaled down or scaled up.
As a preferable technical solution, the first variable resistor and the second variable resistor implement resistance change by using a laser trimming technique, and a diode or a metal fuse connected in parallel at two ends of the resistor.
As a preferable technical solution, a diode is provided between the positive input terminal 2 and the second variable resistor, and the diode is used for performing reverse direction correction on the port of the input terminal 2.
The invention has the beneficial effects that: one is that the circuit has a wide range of use. Secondly, through an accurate bidirectional correction technology, parameter dispersion caused in circuit manufacturing is effectively reduced, and the wafer test qualified rate is improved; and thirdly, the same circuit can realize that the parameters of the circuits at all positions of the whole wafer reach a uniform level only by correcting the circuits during wafer-level testing, thereby reducing the risk of increasing the inventory by grades according to the use requirements of customers and reducing the operation cost of enterprises.
The above-described and other features, aspects, and advantages of the present application will become more apparent with reference to the following detailed description.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 shows a design concept 1 of an embodiment of the present invention.
Fig. 2 shows a design concept 2 of the embodiment of the present invention.
Fig. 3 is an illustration of the practice of the present invention.
Fig. 4 shows a first implementation of the variable resistor according to the present invention.
Fig. 5 shows a second implementation of the variable resistor according to the present invention.
Fig. 6 shows a third implementation of the variable resistor according to the present invention.
Reference numerals:
the circuit comprises a first current source 1, a first variable resistor 2, a first limit resistor 3, a second variable resistor 4, a second current source 5, a second limit resistor 6, a constant current source 7 and a diode 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
A trimming circuit for an operational amplifier circuit is composed of a first variable resistor, a first current source, an input terminal 1, an output terminal 1, a first limit resistor, a second variable resistor, a second current source, an input terminal 2, an output terminal 2, a second limit resistor, a constant current source and a power supply; one end of the first variable resistor is electrically connected with one end of the first current source, and the other end of the first variable resistor is electrically connected with one end of the first limiting resistor; the other end of the first limiting resistor is electrically connected with one end of the output terminal 1 and one end of the input terminal 1 respectively; the other end of the input terminal 1 is electrically connected with a constant current source; one end of the second variable resistor is electrically connected with one end of a second current source, and the other end of the second variable resistor is electrically connected with one end of a second limiting resistor; the other end of the second limiting resistor is electrically connected with one end of the output terminal 2 and one end of the input terminal 2 respectively; the other end of the input terminal 2 is electrically connected with a constant current source; when the other ends of the first current source and the second current source are grounded, the other end of the constant current source is electrically connected with a power supply; when the other ends of the first current source and the second current source are electrically connected with the power supply, the other end of the constant current source is grounded.
Referring to fig. 1 and fig. 2, a schematic circuit structure diagram of a bidirectional correction technique for precision of an operational amplifier circuit according to the present invention includes a first variable resistor, a second variable resistor, a first current source, a second current source, an input terminal 1, a first limiting resistor, a second limiting resistor, a constant current source, and an input terminal 2.
Specifically, the circuit resists implementation: the variable resistor changes the resistance value through a trimming technology and corrects the current value of one path of the input terminal, and the input variable resistor mainly changes the resistance value of the variable resistor through the trimming technology and corrects the current value of one path of the input terminal. The current source is a current derived from the power supply source and modified by the variable resistor, and the current source is a current derived from the power supply source and modified by the variable resistor.
The first limiting resistor and the second limiting resistor are arranged for overcoming the base width modulation effect or the channel length modulation effect of the input terminal from the practical application of the operational amplifier, and are used for controlling the working conditions of the input terminal 1 and the input terminal 2 to be consistent as much as possible.
The constant current source is used for controlling the constancy of the overall current of the operational amplifier, so that the current values of the input terminal 1 and the input terminal 2 can be flexibly controlled on the premise that two paths of total currents are constant by correcting the first variable resistor and the second variable resistor.
In particular, the patent of my company has been applied to the precise control of the input threshold voltage of the earth leakage protector. Referring to fig. 3, specifically, the diode is used for reducing the voltage at the input terminal 2, and the port of the input terminal 1 is modified in a sequentially increasing manner by 10uA, 20uA, 40uA and 80uA, and the port of the input terminal 2 is modified in advance by 200uA, so that the wafer-level test yield of 99.9% of different wafers is achieved.
Referring to fig. 4, the variable resistor is formed by connecting n +1 sets of resistor sequences in series, wherein the resistor sequences are decreased or increased once, and the resistor sequences can be respectively connected to pins, and a diode or a trimming metal wire is connected in series between two adjacent pins to form the whole trimming circuit. When the series diode is not broken down and short-circuited, the resistor is in a use state initially without trimming, and if the current of the current needs to be increased, the breakdown short circuit of the diode can be realized by sequentially enabling the current between two adjacent off pins to be as 6V voltage and 2.5A current, so that the adjustable resistor connected in parallel with the diode is short-circuited, and the purpose of increasing the current is achieved, for example, the current can be sequentially increased from 1uA,2uA,4uA and 8uA … ….
The variable resistor is formed by connecting n +1 groups of once decreasing or increasing resistor sequences in series, pins can be connected with the variable resistor in parallel, and a trimming metal wire is connected between two adjacent pins in series to form the whole trimming circuit. When the trimming resistance wire is not fused, and is not initially trimmed, the resistor is in a short-circuit state, if the current of the circuit needs to be reduced, the metal wire can be fused by sequentially electrifying the adjacent two pins for 1-10ms, such as 1-2.5A current, so that the purpose of reducing the current is achieved by using the adjustable resistor with the parallel diodes, and the current can be sequentially reduced from nuA,1/2nA …, for example.
The variable resistor sequence can be in a short circuit state through a metal wire without any pin, and the passivation layer window at the position is opened, so that the variable resistor cloud is in a short circuit state, if the variable resistor with any gear is needed, the sequence can be realized through a laser trimming technology, and the metal wires at two ends of the resistor are fused, for example, the current can be sequentially decreased from nuA and 1/2uA ….
It should be noted that, referring to fig. 5, the present invention is not limited to the same trimming method of, for example, a diode, such as a metal fuse, and can also implement a bidirectional trimming technique by different trimming methods at one end of the input terminal 1 or one end of the input terminal 2. For example, in the adjustable resistance sequence of one path of the input terminal 1, the terminals T1 to Tn are connected through diodes, and the resistance between the adjacent pins T1 to Tn is in an open circuit state, and meanwhile, the terminals Tn and Tn +1 are connected through metal fuses, and the resistance between the terminals Tn and Tn +1 is in a short circuit state, so that the adjustment can be realized in both the upper direction and the lower direction through different adjustment modes. Which is within the scope of protection of this patent.
Referring to fig. 6, the present invention is not limited to the same trimming method of, for example, a diode, such as a metal fuse, but can also realize a bidirectional trimming technique by different trimming methods at one end of the input terminal 1 or one end of the input terminal 2. For example, in the adjustable resistance sequence of one path of the input terminal 1, T1 to Tn are connected through a metal fuse, and the resistance between adjacent pins T1 to Tn is in a short-circuit state, and at the same time, Tn and Tn +1 are connected through a diode, and the resistance between pins Tn and Tn +1 is in an open-circuit state, so that the adjustment can be realized in both the upper and lower directions through different adjustment modes. Which is within the scope of protection of this patent.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and the description is given here only for clarity, and those skilled in the art should integrate the description, and the embodiments may be combined appropriately to form other embodiments understood by those skilled in the art.
Claims (8)
1. A trimming circuit for an operational amplifier circuit is characterized by comprising a first variable resistor, a first current source, an input terminal 1, an output terminal 1, a first limiting resistor, a second variable resistor, a second current source, an input terminal 2, an output terminal 2, a second limiting resistor, a constant current source and a power supply;
one end of the first variable resistor is electrically connected with one end of a first current source, and the other end of the first variable resistor is electrically connected with one end of a first limiting resistor; the other end of the first limiting resistor is electrically connected with one end of the output terminal 1 and one end of the input terminal 1 respectively; the other end of the input terminal 1 is electrically connected with a constant current source;
one end of the second variable resistor is electrically connected with one end of a second current source, and the other end of the second variable resistor is electrically connected with one end of a second limiting resistor; the other end of the second limiting resistor is electrically connected with one end of the output terminal 2 and one end of the input terminal 2 respectively; the other end of the input terminal 2 is electrically connected with a constant current source;
when the other ends of the first current source and the second current source are grounded, the other end of the constant current source is electrically connected with a power supply;
when the other ends of the first current source and the second current source are electrically connected with the power supply, the other end of the constant current source is grounded.
2. The trimming circuit of claim 1, wherein the first variable resistor changes the resistance value and corrects the current value of one input terminal 1 way by the trimming technique.
3. The trimming circuit of claim 1, wherein the second variable resistor changes the resistance value and corrects the current value of one input terminal 2 way by the trimming technique.
4. The trimming circuit for an operational amplifier circuit as set forth in claim 1, wherein the first limiting resistor and the second limiting resistor are used for controlling and making the operating conditions of the input terminal 1 and the input terminal 2 as consistent as possible.
5. The trimming circuit for an operational amplifier circuit according to claim 1, wherein the constant current source is configured to control the overall current of the operational amplifier to be constant, so that the current values of the input terminal 1 and the input terminal 2 can be flexibly controlled on the premise that two total currents are constant by modifying the first variable resistor and the second variable resistor.
6. The trimming circuit of claim 1, wherein the first variable resistor and the second variable resistor are each formed by connecting a plurality of resistors in series, and the resistances of the plurality of resistors are scaled down or scaled up.
7. The trimming circuit for an operational amplifier circuit as claimed in claim 6, wherein the first variable resistor and the second variable resistor are configured to change the resistance by using a laser trimming technique, a diode connected in parallel to the two ends of the resistor, or a metal fuse.
8. The trimming circuit for an operational amplifier circuit as set forth in claim 1, wherein a diode is disposed between the positive input terminal 2 and the second variable resistor, and the diode is used for performing reverse direction correction on the port of the input terminal 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210313533.XA CN114637354A (en) | 2022-03-28 | 2022-03-28 | Trimming circuit for operational amplifier circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210313533.XA CN114637354A (en) | 2022-03-28 | 2022-03-28 | Trimming circuit for operational amplifier circuit |
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| CN114637354A true CN114637354A (en) | 2022-06-17 |
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| CN202210313533.XA Pending CN114637354A (en) | 2022-03-28 | 2022-03-28 | Trimming circuit for operational amplifier circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115407819A (en) * | 2022-09-28 | 2022-11-29 | 上海积塔半导体有限公司 | Voltage regulating circuit, operation method thereof and chip |
| CN115588964A (en) * | 2022-12-12 | 2023-01-10 | 杭州红芯微电子信息科技有限公司 | Threshold voltage correctable full-waveband leakage detection protection circuit |
| CN116578155A (en) * | 2023-07-14 | 2023-08-11 | 上海英联电子科技有限公司 | Adjustment method and system for trimming circuit |
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| CN206595967U (en) * | 2017-03-23 | 2017-10-27 | 苏州博芯联电子科技有限公司 | A kind of amplifier input offset voltage of reducing trims circuit |
| CN107612512A (en) * | 2017-08-22 | 2018-01-19 | 西安微电子技术研究所 | High accuracy, the Flouride-resistani acid phesphatase operational amplifier of low noise trim circuit and method for repairing and regulating |
| WO2018076599A1 (en) * | 2016-10-31 | 2018-05-03 | 深圳市中兴微电子技术有限公司 | Dynamic comparator, method for calibrating offset thereof, and computer storage medium |
| CN110277966A (en) * | 2019-05-09 | 2019-09-24 | 上海类比半导体技术有限公司 | A kind of self-calibration circuit and calibration method |
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2022
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103296974A (en) * | 2013-04-27 | 2013-09-11 | 聚辰半导体(上海)有限公司 | Self-calibration buffer amplifier in voice coil motor driver and resistor trimming network |
| WO2018076599A1 (en) * | 2016-10-31 | 2018-05-03 | 深圳市中兴微电子技术有限公司 | Dynamic comparator, method for calibrating offset thereof, and computer storage medium |
| CN206595967U (en) * | 2017-03-23 | 2017-10-27 | 苏州博芯联电子科技有限公司 | A kind of amplifier input offset voltage of reducing trims circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115407819A (en) * | 2022-09-28 | 2022-11-29 | 上海积塔半导体有限公司 | Voltage regulating circuit, operation method thereof and chip |
| CN115588964A (en) * | 2022-12-12 | 2023-01-10 | 杭州红芯微电子信息科技有限公司 | Threshold voltage correctable full-waveband leakage detection protection circuit |
| CN115588964B (en) * | 2022-12-12 | 2023-03-03 | 杭州红芯微电子信息科技有限公司 | Threshold voltage correctable full-waveband leakage detection protection circuit |
| CN116578155A (en) * | 2023-07-14 | 2023-08-11 | 上海英联电子科技有限公司 | Adjustment method and system for trimming circuit |
| CN116578155B (en) * | 2023-07-14 | 2023-09-15 | 上海英联电子科技有限公司 | Adjustment method and system for trimming circuit |
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