I have been designing a PLL which gives an output frequency in the range (400-500)MHz to the reference input frequency of (20-25)MHz.So for doing the pnoise analysis I have added the PSS as well as Pnoise analysis
I have made the following as setup for the analysis for a frequency of 500MHz. I have chosen 1) shooting method instead of harmonic balance 2)beat frequency to be the output of the divider (divider ratio is 20) that is 25MHz and also output of the PLL is selected as divider out in Pnoise tab. But it seems that the PSS is not converging and thus pnoise is failing.
So please direct me with the procedure for PSS as well as Pnoise for a PLL not for VCO alone.
Cadence has a methodology for simulating the pnoise of a PLL in lieu
of a VCO. Have you examined either of these?
(Chapter 9 "Noise-Aware PLL Flow")
Hi Shawn, Jithin,
The PLL Noise Aware flow is no longer recommended. It is being (or has been) removed from the documentation in MMSIM12.1.
You may also want to look at transient/transient noise analysis.