CN202025069U - Circuit for testing operational amplifier IC (integrated circuit) parameters by utilizing auxiliary operational amplifier - Google Patents
Circuit for testing operational amplifier IC (integrated circuit) parameters by utilizing auxiliary operational amplifier Download PDFInfo
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- CN202025069U CN202025069U CN2011200090300U CN201120009030U CN202025069U CN 202025069 U CN202025069 U CN 202025069U CN 2011200090300 U CN2011200090300 U CN 2011200090300U CN 201120009030 U CN201120009030 U CN 201120009030U CN 202025069 U CN202025069 U CN 202025069U
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Abstract
The utility model relates to a circuit for testing operational amplifier IC (integrated circuit) parameters by utilizing an auxiliary operational amplifier, which is characterized in that: one end of a resistance R1 is connected with an alternating current power supply VI1, the other end of the resistance R1 is connected with a resistance R11 and a resistance R3 in series, the other end of the resistance R11 is connected with the anti-phase end of an operational amplifier A1 to be tested, one end of a resistance R2 is connected with the alternating current power supply VI1, the other end of the resistance R2 is connected with a resistance R10 and a resistance R4 in series, the other end of the R11 is connected with the in-phase end of the operational amplifier A1 to be tested, the other end of the power supply VI1 is grounded, the other end of the R4 is grounded, the other end of the R3 is connected with one end of one branch of a two-way switch S4, the other end of the switch S4 is connected with the output end of the auxiliary operational amplifier, the output end of the A1 is connected with one end of the other branch of the two-way switch S4, the other end of the switch S4 is connected with the reverse input end of an A2, the output end of the A1 is connected with one end of a switch S3, the other end of the S3 is connected with a resistance RL in series and then is grounded, the in-phase end of the auxiliary operational amplifier A2 is connected with an alternating current power supply VI2, the other end of the VI2 is grounded, switches S1 and S2 are respectively connected onto the two ends of the resistances R11 and R10 in parallel, and the two ends of the resistance R3 are connected with a compensation capacitor C2 in parallel. The circuit provided by the utility model has a simple structure, is convenient to use, is easy to realize and can conveniently test the operational amplifier parameters.
Description
Technical field
The utility model relates to the circuit that utilizes auxiliary amplifier test amplifier class IC parameter.
Background technology
At present, be used to test amplifier class IC parameter and need use special testing apparatus, these equipment costs are higher, and the circuit structure complexity when equipment breaks down, is difficult to maintenance again simultaneously, increased cost for the work of test amplifier class IC.
Summary of the invention
In view of this, the purpose of this utility model provides a kind of circuit that utilizes auxiliary amplifier test amplifier class IC parameter, and this circuit structure is simple, is easy to realize, can test the operational amplifier parameter easily.
Utilize the circuit of auxiliary amplifier test amplifier class IC parameter, comprise integrated transporting discharging A1 to be measured, booster amplifier A2, switch S 1, S2, S3, S4, AC power VI1, VI2, resistance R 1, R2, R3, R4, R10, R11, RL, capacitor C 2, it is characterized in that: resistance R 1 one termination AC power VI1, other end resistance in series R11 and resistance R 3, the end of oppisite phase of amplifier A1 is surveyed in the reception of the R11 other end, resistance R 2 one termination AC power VI1, other end resistance in series R10 and resistance R 4, the in-phase end of amplifier A1 is surveyed in the reception of the R11 other end, power supply VI1 other end ground connection, R4 other end ground connection, one end of the branch road of another termination two-way switch of R3 S4, the output terminal of the auxiliary amplifier of switch S 4 another terminations, one end of another branch road of A1 output termination two-way switch S4, another connects the reverse input end of A2 switch S 4, A1 output connects an end of switch S 3, ground connection behind the S3 other end resistance in series RL, the homophase termination AC power VI2 of auxiliary amplifier A2, VI2 other end ground connection, switch S 1, S2 is connected in parallel on resistance R 11 respectively, the R10 two ends, resistance R 3 two ends shunt compensation capacitor C 2.
AO2 〉=80dB of auxiliary amplifier A1, VICM2 should be greater than output voltage swing (VOM2 〉=10V at least greatly ± 10V), of A1.R1, R2 get 50 Ω, and R3, R4 get 50k Ω, and R10, R11 get 10k Ω.
The utility model circuit is simple, easy to use, be easy to realize, can realize the test of amplifier class IC parameter with the cost of minimum.
Description of drawings
Fig. 1 is the circuit diagram of the utility model embodiment.
Embodiment
Utilize the circuit of auxiliary amplifier test amplifier class IC parameter, as shown in Figure 1, comprise integrated transporting discharging A1 to be measured, booster amplifier A2, switch S 1, S2, S3, S4, AC power VI1, VI2, resistance R 1, R2, R3, R4, R10, R11, RL, capacitor C 2, it is characterized in that: resistance R 1 one termination AC power VI1, other end resistance in series R11 and resistance R 3, the end of oppisite phase of amplifier A1 is surveyed in the reception of the R11 other end, resistance R 2 one termination AC power VI1, other end resistance in series R10 and resistance R 4, the in-phase end of amplifier A1 is surveyed in the reception of the R11 other end, power supply VI1 other end ground connection, R4 other end ground connection, one end of the branch road of another termination two-way switch of R3 S4, the output terminal of the auxiliary amplifier of switch S 4 another terminations, one end of another branch road of A1 output termination two-way switch S4, another connects the reverse input end of A2 switch S 4, A1 output connects an end of switch S 3, ground connection behind the S3 other end resistance in series RL, the homophase termination AC power VI2 of auxiliary amplifier A2, VI2 other end ground connection, switch S 1, S2 is connected in parallel on resistance R 11 respectively, the R10 two ends, resistance R 3 two ends shunt compensation capacitor C 2.
AO2 〉=80dB of auxiliary amplifier A1, VICM2 should be greater than output voltage swing (VOM2 〉=10V at least greatly ± 10V), of A1.R1, R2 get 50 Ω, and R3, R4 get 50k Ω, and R10, R11 get 10k Ω.
A1, A2 are connected into closed-loop system, in order to guarantee closed loop energy steady operation, compensate into the first order pole frequency characteristic.
Below introduce and utilize this circuit that the parameter of operational amplifier is measured.
One, the measurement of input offset voltage Vosl
Make VI1=VI2=0 (short circuit over the ground), closed S1, S2, S4 open S3, because R1, R2 be very little, and input offset current IOS at this moment, the additional offset voltage that produces on R1 is very little.For example IOS1=0.1 μ A then VOSR1=R1 * IOS1=5 μ V since VOS be generally the mV order of magnitude, disregard so this additional offset voltage can omit.A1, A2 are equivalent to the amplifier of an AO=AO1*AO2 among the figure, because will be when amplifier input terminal to be measured is converted in the influence of VOS2 divided by AO1, so comparing with VOS1 also can omit, VOS2 disregards, in addition because AO is very high, so closed loop gain expression formula Af=1 ten (R3/R1) is enough accurate.So have
, if record VOS2=1V, then VOS1=1mV.
Two, the measurement of input offset current IOS1
Make VI1=VI2=0 closed S1, S2, S4, open S3, measure
Open S1, S2 then, measure VO2.Have this moment:
Three, input bias current
I BMeasurement
Make VI1=VI2=0, closed S2, S4 open S1, S3, measure
Then, open S2, closed S1 measures
, by concerning of VI-≈ VI+
Because input biasing
Will
With
Subtract each other just and get
Four, the measurement of open-loop voltage gain AO1 and open-loop output resistance rO
Closed S1, S2 and S4 open S3, make VI1=0 and add VI2, at VI2=
The time, measure
, at this moment have
, VI2 is adjusted to
, and measure
, then
So have
With
As add respectively ±
With ±
, can measure the AO1 of output VO1 when opposed polarity, measure the open-loop gain under the different output polarities, and judge the difference of amplifier to be measured load capacity when positive and negative output.If closed S3 can measure the open-loop gain under given pull-up resistor RL
Because AO1 and
Between the pass be
Can get open-loop output resistance thus
The above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (3)
1. utilize the circuit of auxiliary amplifier test amplifier class IC parameter, comprise integrated transporting discharging A1 to be measured, booster amplifier A2, switch S 1, S2, S3, S4, AC power VI1, VI2, resistance R 1, R2, R3, R4, R10, R11, RL, capacitor C 2, it is characterized in that: resistance R 1 one termination AC power VI1, other end resistance in series R11 and resistance R 3, the end of oppisite phase of amplifier A1 is surveyed in the reception of the R11 other end, resistance R 2 one termination AC power VI1, other end resistance in series R10 and resistance R 4, the in-phase end of amplifier A1 is surveyed in the reception of the R11 other end, power supply VI1 other end ground connection, R4 other end ground connection, one end of the branch road of another termination two-way switch of R3 S4, the output terminal of the auxiliary amplifier of switch S 4 another terminations, one end of another branch road of A1 output termination two-way switch S4, another connects the reverse input end of A2 switch S 4, A1 output connects an end of switch S 3, ground connection behind the S3 other end resistance in series RL, the homophase termination AC power VI2 of auxiliary amplifier A2, VI2 other end ground connection, switch S 1, S2 is connected in parallel on resistance R 11 respectively, the R10 two ends, resistance R 3 two ends shunt compensation capacitor C 2.
2. the circuit of the auxiliary amplifier test of utilization according to claim 1 amplifier class IC parameter is characterized in that:
AO2 〉=80dB of auxiliary amplifier A1, VICM2 should be greater than output voltage swing VOM2 〉=10V of A1.
3. the circuit of the auxiliary amplifier test of utilization according to claim 1 amplifier class IC parameter is characterized in that:
Resistance R 1, R2 get 50 Ω, and resistance R 3, R4 get 50k Ω, and resistance R 10, R11 get 10k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200090300U CN202025069U (en) | 2011-01-13 | 2011-01-13 | Circuit for testing operational amplifier IC (integrated circuit) parameters by utilizing auxiliary operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200090300U CN202025069U (en) | 2011-01-13 | 2011-01-13 | Circuit for testing operational amplifier IC (integrated circuit) parameters by utilizing auxiliary operational amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN202025069U true CN202025069U (en) | 2011-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200090300U Expired - Fee Related CN202025069U (en) | 2011-01-13 | 2011-01-13 | Circuit for testing operational amplifier IC (integrated circuit) parameters by utilizing auxiliary operational amplifier |
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Cited By (5)
| 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 |
| CN105372525A (en) * | 2015-11-09 | 2016-03-02 | 上海芯哲微电子科技有限公司 | Test circuit for operational amplifier |
| 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 |
| CN111610424A (en) * | 2019-02-26 | 2020-09-01 | 圣邦微电子（北京）股份有限公司 | Test circuit, test method and test device for operational amplifier |
-
2011
- 2011-01-13 CN CN2011200090300U patent/CN202025069U/en not_active Expired - Fee Related
Cited By (5)
| 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 |
| CN105372525A (en) * | 2015-11-09 | 2016-03-02 | 上海芯哲微电子科技有限公司 | Test circuit for operational amplifier |
| 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 |
| CN111610424A (en) * | 2019-02-26 | 2020-09-01 | 圣邦微电子（北京）股份有限公司 | Test circuit, test method and test device for operational amplifier |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111102 Termination date: 20140113 |