CN203800895U - Offset current parameter programmable type operational amplifier - Google Patents
Offset current parameter programmable type operational amplifier Download PDFInfo
- Publication number
- CN203800895U CN203800895U CN201320732861.XU CN201320732861U CN203800895U CN 203800895 U CN203800895 U CN 203800895U CN 201320732861 U CN201320732861 U CN 201320732861U CN 203800895 U CN203800895 U CN 203800895U
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- CN
- China
- Prior art keywords
- operational amplifier
- offset current
- gear
- relay
- unit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000012360 testing method Methods 0.000 abstract description 8
- 238000003745 diagnosis Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
The utility model provides an offset current parameter programmable type operational amplifier which is composed of a core operational amplifier unit, an offset current grading unit and a logic control unit. According to the operational amplifier, specific offset currents can be presented through external digital logical control; specific offset voltage values are obtained through adjustment by means of a high-input-impedance operational amplifier body with an adjusting end, offset current gears are formed by means of multiple precision resistors connected to the positive input end and negative input end of the core operational amplifier, and gear switching is achieved by means of a relay. A relay control signal is generated through a digital logic device which has at least one digital input end to achieve selection of offset current values. The operational amplifier can be used for function and precision diagnosis of an offset current measurement part of an auxiliary operation amplifier loop circuit in an operational amplifier testing system.
Description
Technical field
The utility model provides a kind of operational amplifier of program-controlled offset current parameter, this operational amplifier can pass through external digital logic control, make it to have standard offset current value, can be used for function and the Accuracy Diagnosis of the offset current measure portion of auxiliary operation amplifier loop circuit in operational amplifier test macro.
Background technology
Operational amplifier is a very important class device in analog circuit, is widely used in various electronic equipments.In simulated testing system, for realizing the test of operational amplifier, according to standard GB/T 3442-86, GB6798-86, adopts the offset current I of auxiliary operation amplifier loop circuit to tested operational amplifier
iOparameter is tested.
In national standard, specify offset current I
iObe defined as: operational amplifier after offset compensation, the additional input offset current of two inputs, making operational amplifier output voltage is zero (or setting), now the numerical value of additional offset current, is offset current.Method of testing is KK1, the KK2 in first closed auxiliary operation amplifier loop circuit, records the output voltage V L0 of auxiliary operation amplifier A, then cut-off switch KK1, KK2, records the output voltage V L1 of auxiliary operation amplifier A, has:
But when practical application, auxiliary operation amplifier loop circuit needs and tested operational amplifier forms normally work of closed circuit jointly, can only rely in the past the method that retains some operational amplifiers " standard sample of photo " to carry out comparing, therefore be difficult to independently the certainty of measurement of circuit is diagnosed and assessed.The method is difficult to cover larger parameter area, the offset current I of " standard sample of photo " simultaneously
iOparameter value is not often the required optimal selection of function and Accuracy Diagnosis yet.
Summary of the invention
The utility model provides a kind of operational amplifier of program-controlled offset current parameter, on same operational amplifier, realize the program control selection of multiple offset current values, can substitute " standard sample of photo " function and Accuracy Diagnosis for simulated testing system auxiliary operation amplifier loop circuit.
The utility model is achieved through the following technical solutions: the utility model comprises that its main operational amplifier unit, offset current divide gear unit, logic control element.Described its main operational amplifier unit adopts the high input impedance single channel operational amplifier U1 with adjustable side, accesses potentiometer W1 between the adjustable side of its main operational amplifier.Its main operational amplifier unit positive input terminal divides the two ends that keep off unit to be connected with described offset current respectively with negative input end.Described offset current divides gear unit to have more than one gear, is relation in parallel between each gear.Every gear is in series by a precision resistance (RJ1, RJ2, RJ3) and a relay (K1, K2, K3), and precision resistance one end is connected with the relay of this gear, and the other end is connected with the precision resistance of other gear; Relay one end is connected with the precision resistance of this gear, and the other end is connected with the relay of other gear.Offset current divides the relay control signal that keeps off unit to be produced by the digital logic device in described logic control element, realizes operational amplifier and organize more the program control selection of offset current value.
Brief description of the drawings
Fig. 1 is the offset current I specifying in standard GB/T 3442-86
iOtest philosophy figure, has drawn auxiliary operation amplifier loop circuit, has marked to offset current and has tested relevant relay K K1 and KK2 and the resistance R position in circuit;
Fig. 2 is theory diagram of the present utility model, has illustrated that the operational amplifier each several part of program-controlled offset current parameter forms and annexation.
Embodiment
Its main operational amplifier U1 select there is adjustable side, offset current is little and the little high input impedance operational amplifier that drifts about, as make one and there are 3 I
iOthe operational amplifier of gear need to be placed 3 precision resistances between the positive-negative input end of its main operational amplifier, as RJ1=20K Ω, RJ2=200K Ω, RJ3=2M Ω, and switches with relay K 1-K3 respectively.Between the adjustable side of its main operational amplifier, access potentiometer W1, by high accuracy number multimeter or operational amplifier test macro, regulate this potentiometer, the offset voltage of its main operational amplifier is adjusted to the particular value of non-zero, as 200uV.As one of attracting electric relay K1-K3, with auxiliary operation amplifier loop circuit measurement I
iOwhen value, one of bias current Ib+ and Ib-part current flowing resistance RJ1-RJ3, but do not flow into its main operational amplifier.The I producing
iOvalue is:
Wherein I
iOXfor the offset current value of its main operational amplifier, can in the time that K1-K3 all disconnects, record, and can carry out software deduction, because select high input impedance operational amplifier, work as I
iOXmuch smaller than I
iOi when value
iOXcan ignore.
As offset voltage V
oS=200uV, attracting electric relay K1, RJ1=20K Ω place in circuit, measures I
iOvalue, and have I
iO=10nA × 2-I
iOX, then disconnect relay K 1, now bias current Ib-=Ibx-, Ib+=Ibx+, can record the I of its main operational amplifier
iOX, and calculate according to formula, should obtain 20nA accurately.
Work as again and disconnect relay K 1 and K3, adhesive K2, RJ2=200K Ω place in circuit, can obtain offset current value 2nA accurately by above method.Attracting electric relay K3, RJ3=2M Ω place in circuit, can obtain offset current value 200pA accurately.
Logic control element receives outside control signal, and adhesive and the disconnection of go forward side by side row decoding and control relay only allow a relay adhesive when a certain state.Decoding circuit can be selected programmable logic device, or general digital decoding circuit carries out logic control.
The utility model has been practically applicable to diagnosis and the assessment of auxiliary operation amplifier loop circuit in simulated testing system, and obtains good effect.
Claims (3)
1. an operational amplifier for program-controlled offset current parameter, its technical characterictic is: be made up of its main operational amplifier unit, offset current stepping unit, logic control element three parts.
2. the operational amplifier of program-controlled offset current parameter according to claim 1, it is characterized in that: its main operational amplifier unit adopts the high input impedance single channel operational amplifier U1 with adjustable side, accesses potentiometer W1 between the adjustable side of its main operational amplifier.Its main operational amplifier unit positive input terminal divides the two ends that keep off unit to be connected with described offset current respectively with negative input end.
3. the operational amplifier of program-controlled offset voltage parameter according to claim 1, is characterized in that: offset current divides gear unit to have more than one gear, is relation in parallel between each gear.Every gear is in series by a precision resistance (RJ1, RJ2, RJ3) and a relay (K1, K2, K3), and precision resistance one end is connected with the relay of this gear, and the other end is connected with the precision resistance of other gear; Relay one end is connected with the precision resistance of this gear, and the other end is connected with the relay of other gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320732861.XU CN203800895U (en) | 2013-11-20 | 2013-11-20 | Offset current parameter programmable type operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320732861.XU CN203800895U (en) | 2013-11-20 | 2013-11-20 | Offset current parameter programmable type operational amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203800895U true CN203800895U (en) | 2014-08-27 |
Family
ID=51383079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320732861.XU Expired - Lifetime CN203800895U (en) | 2013-11-20 | 2013-11-20 | Offset current parameter programmable type operational amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203800895U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2612872C1 (en) * | 2016-01-14 | 2017-03-13 | Акционерное общество "Российская корпорация ракетно-космического приборостроения и информационных систем" (АО "Российские космические системы") | Device for measuring electrical parameters of operational amplifiers and voltage comparators |
| RU191613U1 (en) * | 2019-03-21 | 2019-08-14 | Публичное акционерное общество "Микрон" (ПАО "Микрон") | The scheme for measuring the parameters of the input and transfer characteristics of operational amplifiers and voltage comparators |
| CN110361646A (en) * | 2019-07-12 | 2019-10-22 | 北京华峰测控技术股份有限公司 | A kind of operational amplifier test circuit and test method |
-
2013
- 2013-11-20 CN CN201320732861.XU patent/CN203800895U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2612872C1 (en) * | 2016-01-14 | 2017-03-13 | Акционерное общество "Российская корпорация ракетно-космического приборостроения и информационных систем" (АО "Российские космические системы") | Device for measuring electrical parameters of operational amplifiers and voltage comparators |
| RU191613U1 (en) * | 2019-03-21 | 2019-08-14 | Публичное акционерное общество "Микрон" (ПАО "Микрон") | The scheme for measuring the parameters of the input and transfer characteristics of operational amplifiers and voltage comparators |
| CN110361646A (en) * | 2019-07-12 | 2019-10-22 | 北京华峰测控技术股份有限公司 | A kind of operational amplifier test circuit and test method |
| CN110361646B (en) * | 2019-07-12 | 2024-01-02 | 北京华峰测控技术股份有限公司 | Operational amplifier test circuit and test method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140827 |
|
| CX01 | Expiry of patent term |