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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> pnoise/jitter and pnoise/time average discrepancy with Cadence Spectre https://designers-guide.org/forum/YaBB.pl?num=1581619188 Message started by threepwood on Feb 13th, 2020, 10:39am |
Title: pnoise/jitter and pnoise/time average discrepancy with Cadence Spectre Post by threepwood on Feb 13th, 2020, 10:39am Hi everyone, I try to get the jitter from a clock generator, but I also need the phase noise curve for other reasons: - When I simulate my circuit with the pnoise/jitter method, I get a RMS Jitter in a given bandwidth of 594.386fs (Jee>RMS). - And when I simulate with the pnoise/time average method, by calculating my Jitter from the Phase Noise curve, I get 269.2fs. Assuming that the pnoise>PM>Phase Noise plot is the IEEE definition, say Single-Sideband-to-Carrier Ratio, so-called L(df), "L-script of df", I compute the RMS jitter as follows in my calculator: [1 / sqrt(2)*pi*f0] * sqrt{ INTEGRAL[ L(df).df ] } Of course, here L(df) is converted in linear, L(df)=10^LdBc(df)/10 In your opinion what do I miss?? Thanks a lot in advance for your help! |
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