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Question about jitter mode and modulated mode in PNOISE

Hi,

I'm running phase noise simulation of a frequency divider.
Since it's a driven system and only threshold crossing is of concern,
I set "source type=jitter" to calculate the edge-to-edge jitter so as phase noise.

My question is:
When I "set source type=modulated" and plot the PM phase noise of the divider output,
the phase noise is different from that of "source type=jitter".
I am curious about what the plotted phase noise means in digital circuit, if I choose PM phase noise and set "source type=modulated"?
I used to consider the PM phase noise as the PSD of phase error, and shouldn't it be the same as 20log(|2*pi*f*Jee|)?

Thanks.

Frank Wiedmann over 14 years ago

This question has been answered in detail by Ken Kundert at http://www.designers-guide.org/Forum/YaBB.pl?num=1309258199 (this is just as a reference for other readers, I know that the original question in that thread was from you).
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