sheldon wrote on Mar 3rd, 2010, 7:58pm:If in your case, if you are running the VCO open-loop,
then PSS is not the appropriate analysis.
From practical point of view, there are many very important meanings in running simulation of "free-running VCO + Mixer" instead of "analogLib/vsource" or "analogLib/port" of fixed frequency.
Here
autonomous-PSS with slave PAC, PXF, Pnoise, etc. is very useful if you don't require IP3 evaluation, analysis of frequency pulling by interference signal, etc.