tm123
Community Member
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Posts: 67
Chicago, IL
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Hi EL,
This is an interesting question. I think one important thing to realize is that the phase noise is only relevant at the zero crossing(s) of the output waveform, assuming the divider drives another edge-sensitive circuit such as a PFD using D FF's. Given that, using PSS-PAC to find the transfer function does not seem right to me. To find divider phase noise I use PNOISE type=timedomain to find the noise exactly at the output waveform zero crossing, then convert that to phase noise using the formula in Ken's paper. If you apply your supply noise vector, you should see some contribution due to that supply noise and perhaps you can infer the transfer function from that result. It is not the most direct way of finding the result you are looking for, maybe others will have different suggestions.
Hope this helps.
Tim
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