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Why the HB analysis PXF results are varying with TSTAB period (after sufficient steady state reach time)

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Dear All,

I am running a ring-oscillator with almost sinusoidal voltage output. I am injecting the PAC current at certain point and seeing the PXF result  for the oscillator output voltage.

I see the oscillator reaches the steady state after 1 ns.

But, the PXF magnitudes for various sidebands are varying as I change the TSTAB from 2ns to 5 ns.

Can anybody please tell why it is doing so ?

Kind Regards,


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