Thanks for the comments.
I'm surprised that Cadence's documentation is so weak on this topic. And users have to go beyond their website to understand this basic usage information.
At least, they should provide application notes for VCO, driven circuits and PFD/CP. The step by step setup procedures and result processing.
Frank Wiedmann wrote on Jul 6th, 2011, 12:52am:For pnoise analysis, the timedomain and jitter noisetypes (PM jitter for autonomous circuits) are almost identical. The only difference is how you specify the strobing times. In general, noisetype=pmjitter is more useful because you specify the times by using threshold crossings. The noisetype=timedomain is the older variant, there you specify the times with respect to the result of the pss analysis.