ywguo
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Hello, Please have a look at http://www.designers-guide.org/Analysis/comparator.pdf. A more simple way is explained below. This is proven to be effective if you have Cadence virtuoso, spectre simulator, and wavescan/VIVA. - make a slow ramp input for the comparator,
- Run monte carlo simulation with mismatch only or process+mismatch.
- then find the time when the comparator output toggles from 0 to 1, or 1 to 0, depending on the input signal increases or decreases.
- Measure the input signal at that time.
- At last the post-processing tool, like Wave Scan or Viva, will plot the histogram of the threshold voltage, with one sigma number. You can made a quick estimation of the max offset voltage with 6 sigma.
Best Regards, Yawei
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