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double tail comparator input refered offset voltage measured using cadence

nkataria

Sir/madam, 

           I'm designing a double tail dynamic comparator using cadence 180nm technology.But I'm some difficulties of determining input referred offset voltage.kingly tell me the steps of plotting the input offset voltage... 

  • nkataria
    Sir,
    I'm a student in NIT Kurukshetra collage and i don't have the access to the License Server Host ID or Reference Key required to access the cadence online support information. So kindly provide me the information.
    Thanking you in anticipation.

    Regards
    NITESH KUMAR
  • Andrew Beckett
    You should be able to get to this still even as a University student. Speak to whoever runs your University Cadence programme. I can't post the contents of the workshop here, but the general principle is that you'd create a piece-wise stepped input voltage (with small enough steps to resolve the offset) and apply this across the input. You'd then clock your comparator once for each input level, and by monitoring the time at which the output flips, you can see the input offset that causes it to flip. Most likely you'd want to run this across Monte Carlo with mismatch as that is likely to be a significant contributor to the input offset. Regards, Andrew
  • sypetre
    in reply to Andrew Beckett

    It seems that the link is not available anymore. Is there a new workshop about measuring offset and make histogram?

  • Andrew Beckett
    in reply to sypetre

    I fixed the link. It used to be to a landing page for all the rapid adoption kits.

  • sypetre
    in reply to Andrew Beckett

    Thanks it works. Do you know if there are documentations to analyse DC offset of a simple comparator ?

  • Andrew Beckett
    in reply to sypetre

    I assume you'd just do a DC sweep with one input being swept past the static other input. You can turn on the "hysteresis" option on the DC analysis if your comparator has hysteresis and you want to see what happens if you sweep up and then back down again.

    Andrew.

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