qpss noise
to calculate the long term jitter.u can follow this.just run the tran simulation for about say 10us.(iam simulating a 50Mhz pll).then in cadence go to results browser from the analog environment.then right click on the vco output(the net whose jitter we need to calculate) and click calculator.after opening the calculator ,calculate the frequency and time period of the waveform.note down this time period.then select the waveform once again and now use the eyediagram function in the calculator ,now enter the data required for the eye diagram.u will measure jitter from the time the pll has aquired lock to the end of the tran simulation period.so just enter those times.then enter the period of the waveform.then click apply and then click evaluate to view the eye diagram.now someone should tell me how to simulate phase noise of the pll
regards
amarnath