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Doing an AC analysis in a time-varying circuit.

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Hi every one :-)

I wanted to do a simulation on an oscillator but I couldn't find any tools in cadence for that. Basically what I want to do is :

Considering an oscillator which is oscillating. During the oscillation I want to do a frequency domain transfer function (AC analysis). I need to linearize the circuit at several point in an oscillation period and find an AC transfer function at a single frequency from an input AC source to the output, and finally plot the magnitude of the transfer function in a period. Basically I want to simulate how the magnitude of a transfer function at a specific frequency is changed during the time (Oscillation period.) 
The frequency which I need the transfer the function is not important it could be exactly at the oscillation frequency or even a little off.
I read about PAC & PXF and if I'm right none of them gives me what I need.
I would appreciate it, if you have any idea.

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