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OPA141: Comprehensive test evaluation

ArTzy
Genius 17645 points
Part Number: OPA141

Hi Experts,

Good day.

A client is trying to use OPA141 to make a product. For that, they would like to evaluate some of the performance of this op amp more accurately.

Hope you can tell us how to test out the curve graph for the following from the datasheet of OPA4177:
>> Figure7 CMRR AND PSRR vs FREQUENCY;
>> Figure15 GAIN AND PHASE vs FREQUENCY;
>> Figure16 CLOSED-LOOP GAIN vs FREQUENCY; and
>> Figure18 OPEN-LOOP OUTPUT IMPEDANCE vs FREQUENCY.

Hoping to get the test principles, methods and test instruments used for these test items.

Thank you for your support.

Regards,
Archie A.

  • 0
    TI__Guru* 93105 points

    Hello Archie,

    As you can imagine the methods and procedures for the op amp tests you list were developed and refined over many years, and at great expense to TI. Sophisticated ATE and lab test systems were developed to perform the AC measurements. The information is deemed Company Confidential meaning TI does not share it with customers so it cannot be provided.

    About all I have to suggest is applying the basic op amp parametric techniques presented in the openly available publications and adapting them across frequency. The customer would have to develop their own test hardware and software. See the following EDN series about op amp testing written by some of our Precision Amplifiers Test and Design Engineers:

    https://www.edn.com/the-basics-of-testing-op-amps-part-1-circuits-test-key-op-amp-parameters

    Frankly, it will be costly and time consuming for a customer to develop an ac test system that can be used "to evaluate some of the performance of this op amp more accurately." I am not sure how much more accurate AC testing they could achieve making their own measurement.

    TI has high confidence in AC parametric performances published in the OPA141 datasheet and suggest the customer rely on it.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    TI__Genius 17645 points

    Hi Thomas,

    Thanks for guiding on these.

    Regards,
    Archie A.