AMSA
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Hi adie_N,
I think you have to measure it in open-loop configure, even because, the comparator is to be used in a open-loop configuration.
I don't know if that input offset is high or not, because I don't know where he will be used and what is the performance and specifications of it.
But in first place, assuming that you are doing correctly the offset measurement, that is, that you have a correct setup for the offset measurement, try to use a very small step in the DC analysis. For example, 1uV or 10uV. Don't forget to tighten the span of the dc sweep so that the simulation don't take too long.
Give the feedback after you try.
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