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.pss Simulation Results Vary in Different runs (SpectreRF)

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I am running .pss simulations on a power amplifier in Sprectre. The output waveform has different amplitudes in different .pss runs. Depending op the number of times I run .pss and whether I have run a .tran before .pss or not, the .pss result veries.


These are the settings that I simulated with:

- errpreset (Accuracy): conservative
- tstab is long enough for the circuit to settle (~1000 cycles)
- Integration method: I tried default/gear2/gear2only (I didnt use trap or traponly as sometimes they did not converge)
- maxperiods: I tried default(20) and 50

The .pss simulation converges, but everytime to a different result. Any suggestion to get consistent results in .pss? What settingcan resolve this issue?

 

Thanks for your guidance in advance.

  • Maybe you load some initial state from a file which is overwritten by a final state at the end of your simulation. Then you start with the end of your first simulation and get some different result, overwrite the conditions file again ....

     Regards elmar

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