CN204964702U - Operational amplifier detects compensating network - Google Patents
Operational amplifier detects compensating network Download PDFInfo
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- CN204964702U CN204964702U CN201520783027.2U CN201520783027U CN204964702U CN 204964702 U CN204964702 U CN 204964702U CN 201520783027 U CN201520783027 U CN 201520783027U CN 204964702 U CN204964702 U CN 204964702U
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- operational amplifier
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- compensating circuit
- negative feedback
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Abstract
The utility model discloses an operational amplifier detects compensating network, include being surveyed operational amplifier and centering on the negative feedback test loop who is surveyed operational amplifier socket interface through socket interface connection, negative feedback test loop has a negative feedback operational amplifier, and negative feedback operational amplifier positive input intercommunication is surveyed operational amplifier's output, and negative feedback operational amplifier output intercommunication is surveyed operational amplifier's negative pole input, it is connected with compensating circuit through programmable switch respectively simultaneously to export at positive input, negative pole input and output and the negative feedback operational amplifier who is surveyed operational amplifier, the utility model discloses pass through programmable switch with compensating circuit and connect in being surveyed between operational amplifier port and the ground, perhaps between port and the port, need not follow the inside fly line that carries on of operational amplifier loop and connect, do not destroy original circuit to the analog switch who sets up through the screen controls, and the institute is so that the operation.
Description
Technical field
The utility model belongs to integrated circuit testing field, and particularly a kind of operational amplifier detects corrective network.
Background technology
Define the operational amplifier loop of standard in GB GB3442-86 and GB6798-86, apply this loop and can test offset voltage VOS, the open-loop gain AVO of operational amplifier, offset current IOS, common-mode rejection ratio CMRR, Power Supply Rejection Ratio PSRR parameter.This loop theory goes for the test of each kind operational amplifier, but because the characteristic of the tested operational amplifier of different cultivars is different, especially frequency characteristic is different, during access standard operational amplifier go-and-return test, cause the self-sustained oscillation of loop sometimes, cause individual parameters or whole parameter testing extremely.Eliminating self-oscillatory conventional compensation approach is the phase compensation fixed for the operational amplifier of different cultivars or the different parameters of same kind operational amplifier, the method is effective but efficiency is lower, the operational amplifier often testing different cultivars must change different corrective networks, and even testing same kind operational amplifier also needs to change corrective network.
Summary of the invention
The purpose of this utility model proposes a kind of operational amplifier to detect corrective network, compensating circuit is connected between tested operational amplifier port and ground by programmed switch, or between port and port, do not need to carry out fly line connection from operational amplifier loop inside, do not destroy original circuit, and controlled, so convenient operation by the analog switch that screen is arranged.
To achieve these goals, the technical solution of the utility model is:
A kind of operational amplifier detects corrective network, comprise the tested operational amplifier that connected by jack interface and the negative feedback test loop around tested operational amplifier jack interface, described negative feedback test loop has a negative feedback operational amplifier, the input of negative feedback operational amplifier positive pole is communicated with the output of tested operational amplifier, and negative feedback operational amplifier exports the negative pole input being communicated with tested operational amplifier; Wherein, input at the positive pole of tested operational amplifier, negative pole input and output and negative feedback operational amplifier export and be connected with compensating circuit respectively by programmed switch simultaneously; Described compensating circuit comprise connect tested operational amplifier negative pole input and output the first negative feedback compensating circuit, connect negative feedback operational amplifier export with the second negative feedback compensating circuit of tested operational amplifier negative pole input, be connected the input of tested operational amplifier negative pole and positive pole input input between compensating circuit, and connect tested operational amplifier and export and the output compensating circuit in analog electrical seedbed.
Scheme is further: described compensating circuit also comprise connect the input of tested operational amplifier negative pole and analog electrical seedbed negative input compensating circuit, be connected tested operational amplifier positive pole and input and the positive input compensating circuit in analog electrical seedbed.
Scheme is further: described programmed switch connects a program controller with input and Presentation Function.
Scheme is further: the described program controller with input and Presentation Function is a program controller with touch screen, and described touch screen is provided with the touch key-press for programmed switch, by the connecting and disconnecting of touch key-press control programmed switch.
Scheme is further: described program controller also includes an oscillation detection circuit, and the detection input of described oscillation detection circuit connects the output of tested operational amplifier and the output of negative feedback operational amplifier.
Scheme is further: described programmed switch is the optical relay switch controlled by program controller, or the electromagnetic relay switch controlled by program controller.
Scheme is further: described programmed switch is multiple, and described compensating circuit is multiple, and a programmed switch connects a compensating circuit.
Scheme is further: described compensating circuit can be electric capacity, or resistance, or the electric capacity of series connection and resistance, or the resistance of series connection and inductance, or the electric capacity of series connection, resistance and inductance.
The utility model is by described corrective network, described operational amplifier loop can be made to possess different cultivars operational amplifier and the ability of the different parameters of same kind operational amplifier being carried out to phase compensation, improve the testing efficiency of operational amplifier, improve the applicability of operational amplifier loop.Compensating circuit is connected between tested operational amplifier port and ground by programmed switch, or between port and port, do not need to carry out fly line connection from operational amplifier loop inside, do not destroy original circuit, and controlled, so convenient operation by the analog switch that screen is arranged.The position that corrective network unit accesses be by operational amplifier for many years test practice obtain effectively and preferred position, substantially can meet the test of nonidentity operation amplifier kind.
Below in conjunction with drawings and Examples, invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the utility model corrective network structured flowchart.
Embodiment
A kind of operational amplifier detects corrective network, as shown in Figure 1, comprise the tested operational amplifier 1 that connected by jack interface and the negative feedback test loop around tested operational amplifier jack interface, described negative feedback test loop has a negative feedback operational amplifier 2, the input of negative feedback operational amplifier positive pole is communicated with the output of tested operational amplifier by resistance R5, negative feedback operational amplifier exports the negative pole input being communicated with tested operational amplifier by resistance R4, certainly as shown in the figure, negative pole input according to operational amplifier tested in test request circuit receives power supply in analog by resistance R1, the positive pole input of tested operational amplifier is by resistance R2, R3 is connected to power supply in analog, the positive input of negative feedback operational amplifier by resistance R6 with connecing power supply (negative pole), wherein, input at the positive pole of tested operational amplifier, negative pole input and output and negative feedback operational amplifier export and be connected with compensating circuit respectively by programmed switch 3 simultaneously, described compensating circuit comprises: the first negative feedback compensating circuit 4 connecting the input and output of tested operational amplifier negative pole, connect the second negative feedback compensating circuit 5 that negative feedback operational amplifier exports and tested operational amplifier negative pole inputs, connect tested operational amplifier negative pole input and positive pole input input between compensating circuit 6, connect the negative input compensating circuit 7 in the input of tested operational amplifier negative pole and analog electrical seedbed, connect tested operational amplifier positive pole to input and the positive input compensating circuit 8 in analog electrical seedbed and the output compensating circuit 9 being connected the output of tested operational amplifier and analog electrical seedbed.By controlling access and the disconnection of programmed switch, under the condition of regulation noise, test offset voltage VOS, the open-loop gain AVO of operational amplifier, offset current IOS, common-mode rejection ratio CMRR, Power Supply Rejection Ratio PSRR parameter.
Can be controlled by computing machine by the mode programmed for programmed switch, be provided with the mode of Non-follow control in the present embodiment, that is: described programmed switch is connection one with the program controller of input and Presentation Function.The realization of input and Presentation Function can by keyboard and display; A preferred scheme is: the described program controller with input and Presentation Function is a program controller with touch screen, described touch screen is provided with the touch key-press for programmed switch, is controlled the connecting and disconnecting of programmed switch by touch key-press.
In embodiment: in order to realize controlling, described program controller also includes an oscillation detection circuit, the detection input of described oscillation detection circuit connects the output of tested operational amplifier and the output of negative feedback operational amplifier.Its oscillation detection circuit can be oscillograph, or with the oscillation detection circuit of microprocessor, mainly test the AC signal of output, include noise, the sine wave of indefinite frequency or square wave, triangular wave, the testing circuit of AC signal is a kind of universal test circuit combined by resistance, electric capacity and operational amplifier.
In embodiment: described programmed switch is the optical relay switch controlled by program controller, or the electromagnetic relay switch controlled by program controller.
In embodiment: in order to realize the measurement of the operational amplifier to different model, and the feature adapted to because even if the output noise of the operational amplifier of the change same model of environment also can change, needing can for the access of the multiple compensating circuit of adjustment, therefore, described programmed switch is also multiple, described compensating circuit is multiple, and a programmed switch connects a compensating circuit.
In embodiment: described compensating circuit can be electric capacity, or resistance, or series connection electric capacity and resistance, or series connection resistance and inductance, or the electric capacity of series connection, resistance and inductance, wherein: described electric capacity can select leaded multilayer ceramic capacitor, electrochemical capacitor, select the electric capacity that frequency characteristic is good as far as possible.The resistance of described resistance, between zero to 1M ohm, also can not weld resistance, by resistance two terminal shortcircuit.Described relay can select electromagnetic relay, optical relay, the Control matrix that can be provided by artificial intelligence device test system or add darlington array by programmable logic device (PLD) and control.
Below that corrective network test case is detected to the described operational amplifier of application: wherein, described corrective network connects a program controller with touch screen, described touch screen is provided with the touch key-press for programmed switch, the connecting and disconnecting of programmed switch are controlled by touch key-press, described programmed switch is multiple, described compensating circuit is multiple, and a programmed switch connects a compensating circuit; Its method of testing is: insert tested operational amplifier, first a first negative feedback compensating circuit and a second negative feedback compensating circuit access test circuit is selected, an oscillation detection circuit is accessed the output contact of the output of tested operational amplifier and negative feedback operational amplifier, a tested operational amplifier output AC signal amplitude is set and allows threshold value, observe output AC signal, adjustment access compensating circuit, when AC signal amplitude is lower than setting threshold value, record tested operational amplifier test parameter; Wherein, described method of testing comprises further: input tested operational amplifier model, judge tested operational amplifier model be tested or do not test, if the step then entering test automatically of having tested, if the step then entering learning compensation the regulation of electrical circuit process of not testing;
The step of described learning compensation the regulation of electrical circuit process is:
The first step: by the output AC signal on visual observations oscillation detection circuit, the compensating circuit of manually adjustment access;
Second step: when a kind of compensating circuit accessed makes output AC signal amplitude improve, then exit the compensating circuit of access, attempt the another kind of compensating circuit of access, then keep the access of this road compensating circuit when the compensating circuit accessed makes output AC signal amplitude reduce;
3rd step: return the first step and continue access compensating circuit; And perform the judgement of second step until output AC signal amplitude is lower than threshold value, and access procedure record when output AC signal amplitude is reduced is preserved, preserve tested operational amplifier model simultaneously;
The step of described automatic test is: the tested operational amplifier access procedure record calling preservation is arranged compensating circuit, tests tested operational amplifier.
Wherein: its oscillation detection circuit can be oscillograph, or by band by the oscillation detection circuit of microprocessor, mainly test the AC signal of output.The present embodiment oscillation detection circuit comprises the oscillographic oscillation detection circuit with microprocessor, can by the output AC signal on visual observations oscillation detection circuit when performing the step of learning compensation the regulation of electrical circuit process, the compensating circuit of manually adjustment access.When entering the step of test automatically, microprocessor oscillation detection circuit is then to the process of output automatic decision.
In embodiment: when the step process of testing when execution is automatic can not reach and make output AC signal amplitude lower than threshold value, return to the step of learning compensation the regulation of electrical circuit process.And notified by display screen and interrupt automatically detecting.
Claims (8)
1. an operational amplifier detects corrective network, comprise the tested operational amplifier that connected by jack interface and the negative feedback test loop around tested operational amplifier jack interface, described negative feedback test loop has a negative feedback operational amplifier, the input of negative feedback operational amplifier positive pole is communicated with the output of tested operational amplifier, and negative feedback operational amplifier exports the negative pole input being communicated with tested operational amplifier; It is characterized in that, input at the positive pole of tested operational amplifier, negative pole input and output and negative feedback operational amplifier export and be connected with compensating circuit respectively by programmed switch simultaneously; Described compensating circuit comprise connect tested operational amplifier negative pole input and output the first negative feedback compensating circuit, connect negative feedback operational amplifier export with the second negative feedback compensating circuit of tested operational amplifier negative pole input, be connected the input of tested operational amplifier negative pole and positive pole input input between compensating circuit, and connect tested operational amplifier and export and the output compensating circuit in analog electrical seedbed.
2. corrective network according to claim 1, it is characterized in that, described compensating circuit also comprises the negative input compensating circuit in the tested operational amplifier negative pole input of connection and analog electrical seedbed, is connected the positive input compensating circuit in the input of tested operational amplifier positive pole and analog electrical seedbed.
3. corrective network according to claim 1, is characterized in that, described programmed switch connects one with input and the program controller of Presentation Function.
4. corrective network according to claim 3, it is characterized in that, the described program controller with input and Presentation Function is a program controller with touch screen, described touch screen is provided with the touch key-press for programmed switch, is controlled the connecting and disconnecting of programmed switch by touch key-press.
5. corrective network according to claim 3, is characterized in that, described program controller also includes an oscillation detection circuit, and the detection input of described oscillation detection circuit connects the output of tested operational amplifier and the output of negative feedback operational amplifier.
6. corrective network according to claim 1, is characterized in that, described programmed switch is the optical relay switch controlled by program controller, or the electromagnetic relay switch controlled by program controller.
7. the corrective network according to claim 1 or 2 or 3 or 6, it is characterized in that, described programmed switch is multiple, and described compensating circuit is multiple, and a programmed switch connects a compensating circuit.
8. corrective network according to claim 1, is characterized in that, described compensating circuit can be electric capacity, or resistance, or the electric capacity of series connection and resistance, or the resistance of series connection and inductance, or the electric capacity of series connection, resistance and inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520783027.2U CN204964702U (en) | 2015-10-10 | 2015-10-10 | Operational amplifier detects compensating network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520783027.2U CN204964702U (en) | 2015-10-10 | 2015-10-10 | Operational amplifier detects compensating network |
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| CN204964702U true CN204964702U (en) | 2016-01-13 |
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| CN201520783027.2U Active CN204964702U (en) | 2015-10-10 | 2015-10-10 | Operational amplifier detects compensating network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137327A (en) * | 2015-10-10 | 2015-12-09 | 北京华峰测控技术有限公司 | Operation amplifier detection compensation network and detection method thereof |
| CN114859211A (en) * | 2022-04-29 | 2022-08-05 | 江西万年芯微电子有限公司 | Operational amplifier function test system |
-
2015
- 2015-10-10 CN CN201520783027.2U patent/CN204964702U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137327A (en) * | 2015-10-10 | 2015-12-09 | 北京华峰测控技术有限公司 | Operation amplifier detection compensation network and detection method thereof |
| CN114859211A (en) * | 2022-04-29 | 2022-08-05 | 江西万年芯微电子有限公司 | Operational amplifier function test system |
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