Hi
The jitter number  that you will get by integrating the total phase noise power and dividing it by the 'w0' (fund frequency in rad/sec) is edge jitter but not the Cycle jitter, Jc.

Basically the phase noise gives u the total integrating noise on a particular VCO node rising edge and falling edges. But while calculating the cycle jitter, Jc, u will see the time difference variation between two succesive edges, where most of the low freq noise is correlated and only high frequency noise differs and shows up.

If you see 2 succesive edges of a VCO node, all the noise that has been integrated on the first edge is also there on second edge. But whatever high freq noise (f>1/T) that came during the particulate time period interval shows up only on 2nd edge. Only this extra noise is used in calculating the Cycle Jitter.

So, u can assume that u need to do some sort of differentiation on the phase noise and then integrate the resultant power to get the Cycle jitter power.

For exact formula to do that diferentiation, see the equation (1-18) in the following artilcle
www.sabreindia.net/cadence/application-note.pdf

Regards
rajkumar

mtp3,

  Use PNOISE jitter option to calculate the jitter. There is an app note
in the documentation that explains how to use it.

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                                                           Sheldon