Thanks a lot for your reply.
After reading through spectreRF(latest manual), I have following confusions:-
If I enter total number of timepoints let's say 4 and the PSS total timepoints=400, then tdnoise takes which timepoints ?
2:- For a stand alone Oscillator relative harmonioc is set to 1, for doing pnoise analysis using Modulated, Jitter and tdnoise.
But for driven circuit, the relative harmonic is set to 0 ( while sweeptype is kept relative) for Modulated,Jitter and tdnoise.
This I am not able to understand. Why this differnce from Oscillator.
What I am thinking is:- Let's say Modulated PM analysis for driven Circuit. The Phase noise is due to fc+fm & fc-fm components.
Where fc is the center/output frequency ( PSS beat freq) of the driven circuit & fm is onepoint of the sweep frequncy.
So the output noise frequency is calculated with respect to ( relative) to fc. So relative harmonic shoould be 1 NOT 0.
But then why relative harm=0 set in the document for driven circuit.