Hi nandy,
Calculate the integrated phase noise based on the extracted table of VCO phase noise. Given it is dominated by white noise, the integrated phase noise is the rms jitter of VCO output. The unit is degree or radian now. Convert the unit to second. Describe your VCO with the rms jitter and do transient simulation.
Probably the rms jitter is too small to be detectable in the transient simulation.
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Personally I prefer an analytical model to derive the rms jitter of the PLL output.
Best Regards,
Yawei