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PSS shooting vs. transient with nport (S-aparm) loading

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Hello,

I am simulating a differential circuit with a tune-load (LC tank), where L is modeled by EMX. I am using AnalogLib/nport cell to include S-parameter behavior of the inductor in my PSS simulations. PSS is using shooting method to solve the circuit. nport cell is created by EMX tool (interpolation method="linear").

Here is the problem that I see:

for a given condition, transient and PSS-shooting results are different (output swing in PSS is wrong; doesn't lineup with current*Rp). I checked the tstab transient results of PSS simulations and I can see that tstab results correlate with transient simulation results. 

I appreciate any comments.

-Masoud

 


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