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Measure Input offset voltage of an open collector comparator

Other Parts Discussed in Thread: TLC3702

Can a servo loop implementation help to determine the input offset voltage of an open collector comparator?

Please help to understand and use a correct circuit to measure the Vos of an open collector comparator.

Thank you,

Bala Suren R

  • Hi Bala,

    Although it may be feasible to implement a servo solution for determining a comparator's voltage offset we have not done that here in Precision Amplifiers applications engineering.

    Since our particular group doesn't handle the comparator products we may not be the best one to ask at TI. The General Purpose Amplifiers E2E forum may be able to better assist you:

    e2e.ti.com/.../

    If they are unable to provide a solution, friend me through the E2E and I will point you to an on-line resource that tells how to set up a conventional bench test solution. It uses common lab type equipment.

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • Hello Bala,

    See the TLC3702 datasheet Parameter Measurement section, pages 10 and 11.

    The circuit uses a triangle wave input with an integrator loop. This is close to how they are actually measured in production.

    You will need a pull-up resistor for the open collector output. But it is important to not run the clock too fast sine the rising and falling edges of the open collector output are not symmetrical and can lead to error.

  • Thank you Thomas, I have raised the query in mentioned forum.

    Sure, will contact you if I didn't get the solution.