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OPA314: Common-mode voltage range

Carlo
Expert 7715 points
Part Number: OPA314

Hi team,

Good day.

Our customer would like to test the Vcm, common-mode voltage range, a parameter of OPA314? What are the methods available and circuits needed to implement to run the test?

Regards,
Carlo

  • Former Member
    0 Former Member

    Hi Carlo,

    I assume by your question that the customer is simply interested in verifying the rail-to-rail input capabilities of the amplifier and not CMRR or something else.

    The easiest way to do this would be to simply place a sample device in a unity gain buffer, sweep the input voltage which will be the input common mode voltage, and observe the output voltage.  The OPA314 has a rail-to-rail output.  So, you will see the output voltage change with a change in input voltage up until you get pretty close to the rails at the output where the output itself will become limited before the input.

    This is just a rudimentary test to be run that can be done quickly and easily to verify the rail-to-rail capabilities.  Please let me know if the customer's questions is different.

    Regards,
    Daniel