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You can use SpectreRF to simulate the vco power spectrum. From that you can calculate jitter and phase noise.
h**p://assets.zarlink.com/CA/Phase_Noise_and_Jitter_Article.pdf
Unfortunately it is very difficult (if possible) to simuale the phase noise in pure SPICE-like simulator, due to its time-varaition nature of the oscillator. If you don't have spectre-RF, try ADS from Agilent (former HP). These are the two knownly simulators which can handle phase noise simulation of an oscillator as far as I know.
if u have HSPICE-RF it can simulate the pase noise
u can see any simulator which use Harmonic balanced simulation engin
@DS or specter-RF or ansoft designer
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