when you come to rf simulation ,firstly u should refer to user manual or reference document.the true is always there.
thanks for reminding.
I've read some manuals including "spectreRF.pdf". But they just simply describe that there are four kinds of output types for pnoise, while no detailed information about the "sources" type and "jitter" type given.
i'll really appreciate that if you have any useful document or any advises on this problem.