Hello,

I'm looking for a Verilog-A model of a VCO with frequency dependent phase noise that runs in pss/pnoise.  The model needs to output a voltage waveform to drive the PFD/CP circuit in my top level PLL.  All I can find in the various references here are models designed for transient analysis or use in a linearized PLL model.  The end goal is to make a VCO/divider combination so I can run a full pss/pnoise sim of my PLL with transistor level models of everything except the VCO.  The frequency dependent noise is achievable, I think, through use of the flicker_noise function.

Would very much appreciate some help.

Thanks!
Peter

Perhaps Listing 1 in http://www.designers-guide.org/Analysis/rf-sim.pdf is what you are looking for.

-Ken

Using random number generators to model phase noise in an oscillator is fundamentally incompatible with PSS not because of hidden state, but because the result is not periodic.

However, the question originally involved using the flicker_noise function. In this case the noise is confined to the small-signal PNoise analysis and is not present during the PSS analysis.

-Ken