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pxf or pxf modulated in simulating VCO PSRR?

I am trying to simulate a VCO's PSRR.

I used two methods to get the result.
The first one is to run the pxf analysis and choose the VCO output nodes as output.
Here is my setting:

The second one is to follow the instruction of the application note "PSRR Characterization Using SpectreRF Autonomous Circuits".
The only difference is "modulated" selected among "Special Analyses".

I run the simulation and compare the results of pxf and pxf modulated.
The simulation results are quite different.
Here is the simulation result:

The green line is the result of pxf modulated (SSB to PM) while the purple one is the result of pxf.

I do not understand why the two results have so large difference (>200 dB)?
and which one should be used to simulate VCO PSRR?

regards,

YCY

Andrew Beckett over 9 years ago

Please contact customer support - we may want to talk about some possible future improvements we're making in this area.
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