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How to derive edge phase noise from Output Noise in sampled Pnoise simulation

I m driving a buffer with a clock of 7 GHz, launching a pss simulation and pnoise sampled at the rising edge of the output ( threshold set at 0).

I obtained the following graph for output noise and edge phase noise

the two spectra differs of 13dB that i suppose be the power of the carrier since i consider:

dbC= 10log( Pnoise/Pc)= 10logPnoise - 10log(Pc)= Output Noise Spectrum -10log(Pc)

so 10log(Pc)=13dB

if I plot the spectrum of the rms output clock i obtain:

so if i consider Pc=Vrms^2 i have

10log(Pc)= -7.87dB

It s not clear for me how the edge phase noise is obtained....What i m doing wrong?

Frank Wiedmann over 2 years ago in reply to ShawnLogan

One should keep in mind that pnoise and jitter are linear analyses (around a periodic operating point), just like pac and pxf. This means that their results are only accurate as long as the noise amplitudes are small enough so that this linear approximation is valid.
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