CN105137327B - A kind of operational amplifier detection compensation network and its detection method - Google Patents
A kind of operational amplifier detection compensation network and its detection method Download PDFInfo
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- CN105137327B CN105137327B CN201510653552.7A CN201510653552A CN105137327B CN 105137327 B CN105137327 B CN 105137327B CN 201510653552 A CN201510653552 A CN 201510653552A CN 105137327 B CN105137327 B CN 105137327B
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Abstract
The invention discloses a kind of operational amplifier to detect compensation network and its detection method, including the tested operational amplifier connected by jack interface and the negative-feedback test loop around tested operational amplifier jack interface, the negative-feedback test loop has a negative feedback operational amplifier, the output of the tested operational amplifier of negative feedback operational amplifier positive pole input connection, the negative pole input of the tested operational amplifier of negative feedback operational amplifier output connection；Compensation circuit is connected with by grammed switch respectively simultaneously in the positive pole input of tested operational amplifier, negative pole input and output and negative feedback operational amplifier output；Compensation circuit is connected between tested operational amplifier port and ground by the present invention by grammed switch, or between port and port, it is not necessary to fly line connection is carried out inside from operational amplifier loop, does not destroy original circuit, and the analog switch set by screen controls, so easy to operation；The self-study of its method and automatic test improve the efficiency of test.
Description
Technical field
The invention belongs to integrated circuit testing field, more particularly to a kind of operational amplifier detection compensation network and its detection
Method.
Background technology
The operational amplifier loop of standard is defined in national standard GB 3442-86 and GB 6798-86, can be with using the loop
Test offset voltage VOS, open-loop gain AVO, offset current IOS, common-mode rejection ratio CMRR, the PSRR of operational amplifier
PSRR parameters.Go for the test of each kind operational amplifier on the loop theory, but because different cultivars is tested computing
The characteristic of amplifier is different, and especially frequency characteristic is different, when accessing standard operational amplifier go-and-return test, causes ring sometimes
The self-oscillation on road, cause individual parameters or whole parameter testings abnormal.It is pin to eliminate self-oscillatory conventional compensation approach
The phase compensation that the different parameters of operational amplifier or same kind operational amplifier to different cultivars fix, this method
Effective but less efficient, different compensation networks must be changed by often testing the operational amplifier of different cultivars, or even test is together
One kind operational amplifier is also required to change compensation network.
The content of the invention
The purpose of the present invention is to propose to a kind of operational amplifier to detect compensation network and its detection method, and compensation circuit is led to
Grammed switch is crossed to be connected between tested operational amplifier port and ground, or between port and port, it is not necessary to put from computing
Carry out fly line connection inside big device loop, do not destroy original circuit, and the analog switch set by screen controls, institute in order to
Operation.
To achieve these goals, the technical scheme is that：
A kind of operational amplifier detection compensation network, including the tested operational amplifier that is connected by jack interface and surround
The negative-feedback test loop of tested operational amplifier jack interface, the negative-feedback test loop have a negative-feedback operation amplifier
Device, the output of the tested operational amplifier of negative feedback operational amplifier positive pole input connection, negative feedback operational amplifier output connection
The negative pole input of tested operational amplifier；Wherein, the positive pole input in tested operational amplifier, negative pole are inputted and exported and bear
Feedback operational amplifier output is connected with compensation circuit by grammed switch respectively simultaneously；It is tested that the compensation circuit includes connection
Operational amplifier negative pole inputs and the first negative-feedback compensation circuit of output, the output of connection negative feedback operational amplifier and tested fortune
Calculate the second negative-feedback compensation circuit of amplifier negative pole input, connect the defeated of the tested input of operational amplifier negative pole and positive pole input
Enter a compensation circuit, and the output compensating circuit on the tested operational amplifier output of connection and analog power ground.
Scheme is further：The compensation circuit is with also including the tested operational amplifier negative pole input of connection and analog power
Negative input compensation circuit, the positive input compensation circuit on the tested operational amplifier positive pole input of connection and analog power ground.
Scheme is further：The grammed switch connects a program controller with input and display function.
Scheme is further：The program controller with input and display function is one with the program control of touch screen
Device, the touch key-press for grammed switch is provided with the touch screen, connecing for grammed switch is controlled by touch key-press
Through and off are opened.
Scheme is further：The program controller also includes an oscillation detection circuit, the inspection of the oscillation detection circuit
Survey the output of the tested operational amplifier of input connection and the output of negative feedback operational amplifier.
Scheme is further：The grammed switch is switched by the optical relay of program controller control, or by program controller
The electromagnetic relay switch of control.
Scheme is further：The grammed switch is multiple, and the compensation circuit is multiple, a grammed switch connection one
Individual compensation circuit.
Scheme is further：The compensation circuit can be electric capacity, or resistance, or the electric capacity of series connection and electricity
Resistance, or the resistance and inductance of series connection, or electric capacity, resistance and the inductance of series connection.
A kind of operational amplifier detection compensation network test method, it is the method for testing based on the compensation network, wherein,
The compensation network connection one is provided with for grammed switch with the program controller for touching screen on the touch screen
Touch key-press, the connecting and disconnecting of grammed switch are controlled by touch key-press, the grammed switch is multiple, the compensation circuit
It is multiple, a grammed switch connects a compensation circuit；The method of testing is：The tested operational amplifier of insertion, is selected first
A first negative-feedback compensation circuit and the second negative-feedback compensation circuit access test circuit are selected, by an oscillation test electricity
The tested operational amplifier output of road access and the output contact of negative feedback operational amplifier, set a tested operational amplifier defeated
Go out AC signal amplitude permission threshold value, observation output AC signal, adjustment access compensation circuit, set when AC signal amplitude is less than
When determining threshold value, tested operational amplifier test parameter is recorded；Wherein, the method for testing further comprises：The tested computing of input
Amplifier Model, it is to have crossed or do not tested after tested to judge tested operational amplifier model, if having tested
Then enter the step of automatic test, if do not tested the step of then entering learning compensation the regulation of electrical circuit process；
The step of learning compensation the regulation of electrical circuit process is：
The first step：By the output AC signal on visual observations oscillation detection circuit, the compensation for manually adjusting access is electric
Road；
Second step：When a kind of compensation circuit of access improves output AC signal amplitude, then the compensation of access is exited
Circuit, attempt to access another compensation circuit, this is then kept when the compensation circuit of access makes output AC signal amplitude reduction
The access of road compensation circuit；
3rd step：The first step is returned to continue to access compensation circuit；And the judgement of second step is performed until output AC signal
Amplitude is less than threshold value, and will record access procedure during output AC signal amplitude reduction and preserve, while preserves tested computing
Amplifier Model；
The step of automatic test is：The tested operational amplifier access procedure preserved record is called to enter compensation circuit
Row is set, and tests tested operational amplifier.
Scheme is further：Methods described further comprises：When perform the step process tested automatically can not reach make it is defeated
When going out AC signal amplitude and being less than threshold value, the step of returning to learning compensation the regulation of electrical circuit process.
The present invention can be such that the operational amplifier loop possesses to different cultivars operation amplifier by the compensation network
Device and the ability that the different parameters of same kind operational amplifier are carried out with phase compensation, improve the test effect of operational amplifier
Rate, improve the applicability of operational amplifier loop.Compensation circuit is connected to tested operational amplifier end by grammed switch
Between mouth and ground, or between port and port, it is not necessary to fly line connection is carried out inside from operational amplifier loop, does not destroy original
There is circuit, and the analog switch set by screen controls, so easy to operation.The position that compensation NE is accessed is logical
Effective and preferable position obtained by operational amplifier test practice for many years, can meet nonidentity operation amplifier substantially
Kind is tested.
Invention is described in detail with reference to the accompanying drawings and examples.
Brief description of the drawings
Fig. 1 is present invention compensation network structure block diagram.
Embodiment
Embodiment 1：
A kind of operational amplifier detection compensation network, as shown in figure 1, being put including the tested computing connected by jack interface
Big device 1 and the negative-feedback test loop around tested operational amplifier jack interface, the negative-feedback test loop have one to bear
Feedback operational amplifier 2, the input of negative feedback operational amplifier positive pole are born by the output of the tested operational amplifier of resistance R5 connections
Feedback operational amplifier output is inputted by the negative pole of the tested operational amplifier of resistance R4 connections, certainly as illustrated, according to survey
Examination requires that the negative pole input that operational amplifier is tested in circuit is connected to power supply simulation ground by resistance R1, is tested operational amplifier
Positive pole input is connected to power supply simulation ground by resistance R2, R3, and the positive input of negative feedback operational amplifier connects electricity by resistance R6
Source（Negative pole）；Wherein, in the positive pole input, negative pole input and output and negative feedback operational amplifier of tested operational amplifier
Output is connected with compensation circuit by grammed switch 3 respectively simultaneously；The compensation circuit includes：The tested operational amplifier of connection is born
Pole inputs and the first negative-feedback compensation circuit 4 of output, connection negative feedback operational amplifier export and are tested operational amplifier and bear
Compensated between the input of second negative-feedback compensation circuit 5 of pole input, the tested operational amplifier negative pole input of connection and positive pole input
Circuit 6, the negative input compensation circuit 7 of the tested operational amplifier negative pole input of connection and analog power ground, the tested computing of connection are put
Big device positive pole input and the positive input compensation circuit 8 on analog power ground and the tested operational amplifier output of connection and analog power
The output compensating circuit 9 on ground.By controlling the access and disconnection of grammed switch, operation amplifier is tested under conditions of regulation noise
The offset voltage VOS of device, open-loop gain AVO, offset current IOS, common-mode rejection ratio CMRR, PSRR PSRR parameters.
It can be controlled by computer with the mode to program for grammed switch, be provided with the present embodiment
The mode controlled manually, i.e.,：The grammed switch is to connect a program controller with input and display function.Input and display
The realization of function can pass through keyboard and display；One preferable scheme is：It is described program control with display function with inputting
Device is a program controller with touch screen, and the touch key-press for grammed switch is provided with the touch screen, is led to
Cross the connecting and disconnecting of touch key-press control grammed switch.
In embodiment：In order to realize control, the program controller also includes an oscillation detection circuit, the oscillation test
The output of the tested operational amplifier of detection input connection and the output of negative feedback operational amplifier of circuit.Its oscillation detection circuit
Can be oscillograph, or the oscillation detection circuit with microprocessor, the AC signal of output is mainly tested, is included
Noise, the sine wave of indefinite frequency or square wave, triangular wave, the detection circuit of AC signal be it is a kind of by resistance, electric capacity and
The universal test circuit that operational amplifier combines.
In embodiment：The grammed switch is switched by the optical relay of program controller control, or is controlled by program controller
Electromagnetic relay switch.
In embodiment：In order to realize the measurement to the operational amplifier of different model, and adapt to due to the change of environment
The characteristics of even output noise of the operational amplifier of same model can also change is, it is necessary to there is a variety of compensation electricity for being available for adjustment
The access on road, therefore, the grammed switch are also multiple, and the compensation circuit is multiple, and a grammed switch connects a benefit
Repay circuit.
In embodiment：The compensation circuit can be electric capacity, or resistance, or the electric capacity and resistance of series connection, or
Person be series connection resistance and inductance, or series connection electric capacity, resistance and inductance, wherein：The electric capacity can select only stone electricity
Hold, electrochemical capacitor, select the good electric capacity of frequency characteristic as far as possible.The resistance of the resistance, can also not between zero arrives 1M ohms
Resistance is welded, by the terminal shortcircuit of resistance two.The relay can select electromagnetic relay, optical relay, can be by artificial intelligence device
The Control matrix or add darlington array to be controlled by PLD that test system provides.
Embodiment 2：
A kind of operational amplifier detection compensation network test method, is based on the test side that network is compensated described in embodiment 1
Method, therefore, the content in embodiment 1 also should be the content in the present embodiment, wherein, the compensation network connection one is with tactile
The program controller of screen is touched, the touch key-press for grammed switch is provided with the touch screen, is controlled by touch key-press
The connecting and disconnecting of grammed switch, the grammed switch are multiple, and the compensation circuit is multiple, a grammed switch connection one
Individual compensation circuit；The method of testing is：The tested operational amplifier of insertion, select first a first negative-feedback compensation circuit and
One the second negative-feedback compensation circuit accesses test circuit, by the tested operational amplifier output of an oscillation detection circuit access and
The output contact of negative feedback operational amplifier, set a tested operational amplifier output AC signal amplitude to allow threshold value, see
Output AC signal is examined, adjustment access compensation circuit, when AC signal amplitude is less than given threshold, records tested operation amplifier
Device test parameter；Wherein, the method for testing further comprises：The tested operational amplifier model of input, judge that tested computing is put
Big type number is to have crossed or do not tested after tested, if that had tested then enters automatic the step of testing, such as
Fruit did not tested the step of then entering learning compensation the regulation of electrical circuit process；
The step of learning compensation the regulation of electrical circuit process is：
The first step：By the output AC signal on visual observations oscillation detection circuit, the compensation for manually adjusting access is electric
Road；
Second step：When a kind of compensation circuit of access improves output AC signal amplitude, then the compensation of access is exited
Circuit, attempt to access another compensation circuit, this is then kept when the compensation circuit of access makes output AC signal amplitude reduction
The access of road compensation circuit；
3rd step：The first step is returned to continue to access compensation circuit；And the judgement of second step is performed until output AC signal
Amplitude is less than threshold value, and will record access procedure during output AC signal amplitude reduction and preserve, while preserves tested computing
Amplifier Model；
The step of automatic test is：The tested operational amplifier access procedure preserved record is called to enter compensation circuit
Row is set, and tests tested operational amplifier.
Wherein：Its oscillation detection circuit can be oscillograph, or the oscillation detection circuit by band by microprocessor, main
If test the AC signal of output.The present embodiment oscillation detection circuit is the inspection of the vibration with microprocessor comprising oscillograph
Slowdown monitoring circuit, the output on visual observations oscillation detection circuit can be passed through when performing the step of learning compensation the regulation of electrical circuit process
AC signal, manually adjust the compensation circuit of access.When entering the step tested automatically, microprocessor oscillation detection circuit is then
To output automatic decision processing.
In embodiment：Output AC signal amplitude is set to be less than threshold value when the step process that execution is tested automatically can not reach
When, the step of returning to learning compensation the regulation of electrical circuit process.And notified by display screen and interrupt automatic detection.
Claims (8)
1. a kind of operational amplifier detection compensation network, including the tested operational amplifier that is connected by jack interface and around quilt
The negative-feedback test loop of operational amplifier jack interface is surveyed, the negative-feedback test loop has a negative-feedback operation amplifier
Device, the output of the tested operational amplifier of negative feedback operational amplifier positive pole input connection, negative feedback operational amplifier output connection
The negative pole input of tested operational amplifier；Characterized in that, in the positive pole input, negative pole input and output of tested operational amplifier
And negative feedback operational amplifier output is connected with compensation circuit by grammed switch respectively simultaneously；The compensation circuit includes connecting
Connect the first negative-feedback compensation circuit of the input of tested operational amplifier negative pole and output, the output of connection negative feedback operational amplifier and
Second negative-feedback compensation circuit of tested operational amplifier negative pole input, the tested operational amplifier negative pole input of connection and positive pole are defeated
Compensation circuit between the input entered, and the output compensating circuit on the tested operational amplifier output of connection and analog power ground；It is described
Compensation circuit can be electric capacity, or the electric capacity and resistance of series connection, or electric capacity, resistance and the inductance of series connection；The journey
Control switch is multiple, and the compensation circuit is multiple, and a grammed switch connects a compensation circuit.
2. compensation network according to claim 1, it is characterised in that the compensation circuit also includes the tested computing of connection and put
The negative input compensation circuit on big device negative pole input and analog power ground, the tested operational amplifier positive pole input of connection and analog power
The positive input compensation circuit on ground.
3. compensation network according to claim 1, it is characterised in that the grammed switch connects one with input and shown
Show the program controller of function.
4. compensation network according to claim 3, it is characterised in that described to be with input and the program controller of display function
One, with the program controller for touching screen, is provided with the touch key-press for grammed switch, by touching on the touch screen
Touch the connecting and disconnecting by key control grammed switch.
5. compensation network according to claim 3, it is characterised in that the program controller also includes an oscillation test electricity
Road, the output of the tested operational amplifier of detection input connection of the oscillation detection circuit and negative feedback operational amplifier it is defeated
Go out.
6. compensation network according to claim 1, it is characterised in that the grammed switch be by program controller control light after
Electric switch, or the electromagnetic relay switch controlled by program controller.
7. a kind of operational amplifier detection compensation network test method, is based on the test side that network is compensated described in claim 1
Method, wherein, the compensation network connection one is provided with for journey with the program controller for touching screen on the touch screen
Control switch touch key-press, by touch key-press control grammed switch connecting and disconnecting, the grammed switch be it is multiple, it is described
Compensation circuit is multiple, and a grammed switch connects a compensation circuit；The method of testing includes：The tested operation amplifier of insertion
The tested operational amplifier negative pole input of device, first selection connection and the first negative-feedback compensation circuit and connection negative-feedback fortune of output
Calculate amplifier output and be tested the second negative-feedback compensation circuit access test circuit of operational amplifier negative pole input, one is shaken
The output contact of the tested operational amplifier output of detection circuit access and negative feedback operational amplifier is swung, a tested computing is set
Amplifier output AC signal amplitude allows threshold value, observation output AC signal, adjustment access compensation circuit, when AC signal width
When degree is less than given threshold, tested operational amplifier test parameter is recorded；Characterized in that, the adjustment access compensation circuit is suitable
Sequence includes：The tested operational amplifier model of input, it is to have crossed or do not tested after tested to judge tested operational amplifier model
Cross, if that had tested then enters automatic the step of testing, if that did not tested then enters learning compensation circuit
The step of adjustment process；
The step of learning compensation the regulation of electrical circuit process is：
The first step：By the output AC signal on visual observations oscillation detection circuit, the compensation circuit of access is manually adjusted；
Second step：When a kind of compensation circuit of access make output AC signal amplitude improve when, then exit access compensation circuit,
Attempt to access another compensation circuit, then keep this road to compensate when the compensation circuit of access makes output AC signal amplitude reduction
The access of circuit；
3rd step：The first step is returned to continue to access compensation circuit；And the judgement of second step is performed until output AC signal amplitude
Less than threshold value, and it will record access procedure during output AC signal amplitude reduction and preserve, while preserve tested operation amplifier
Type number；
The step of automatic test is：The tested operational amplifier access procedure preserved record is called to set compensation circuit
Put, record tested operational amplifier test parameter.
8. according to the method for claim 7, it is characterised in that methods described further comprises：Tested automatically when execution
Step process can not reach when the output AC signal amplitude is less than threshold value, return to the step of learning compensation the regulation of electrical circuit process
Suddenly.
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| CN201510653552.7A CN105137327B (en) | 2015-10-10 | 2015-10-10 | A kind of operational amplifier detection compensation network and its detection method |
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| CN201510653552.7A CN105137327B (en) | 2015-10-10 | 2015-10-10 | A kind of operational amplifier detection compensation network and its detection method |
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| CN105137327B true CN105137327B (en) | 2017-12-08 |
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| CN112367054A (en) * | 2020-11-02 | 2021-02-12 | 中国科学院上海微系统与信息技术研究所 | Operational amplifier compensation circuit with adjustable 3dB bandwidth and phase margin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4896118A (en) * | 1988-10-26 | 1990-01-23 | Westinghouse Electric Corp. | Variable gain current-to-voltage amplifier with gain independent test mode operation |
| CN202025069U (en) * | 2011-01-13 | 2011-11-02 | 博嘉圣（福州）微电子科技有限公司 | Circuit for testing operational amplifier IC (integrated circuit) parameters by utilizing auxiliary operational amplifier |
| CN203414570U (en) * | 2013-08-02 | 2014-01-29 | 聚辰半导体(上海)有限公司 | Testing circuit for zero-drift operation amplifier |
| CN104865515B (en) * | 2015-05-12 | 2017-10-03 | 北京航空航天大学 | A kind of multichannel integrated operational amplifier performance parameter Online Transaction Processing |
| CN204964702U (en) * | 2015-10-10 | 2016-01-13 | 北京华峰测控技术有限公司 | Operational amplifier detects compensating network |
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Address after: 100070 7 floor, No. 2, No. 1, Haiying Road, Fengtai District, Beijing Patentee after: Beijing Hua Feng measurement and control technology Limited by Share Ltd Address before: 100070 7 floor, No. 2, No. 1, Haiying Road, Fengtai District, Beijing Patentee before: BEIJING HUAFENG TEST & CONTROL TECHNOLOGY CO., LTD. |
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