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 .pss Simulation Results Vary in Different runs (SpectreRF) 

Last post Fri, Sep 19 2008 12:00 AM by elmar. 1 replies.
Started by Maryam 03 Sep 2008 02:47 PM. Topic has 1 replies.
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  • Wed, Sep 3 2008 2:47 PM

    • Maryam
    • Top 500 Contributor
    • Joined on Wed, Sep 3 2008
    • Posts 1
    • Points 20
    .pss Simulation Results Vary in Different runs (SpectreRF) Reply
    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 didn't 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.

    • Post Points: 20

  • Fri, Sep 19 2008 12:00 AM

    • elmar
    • Top 500 Contributor
    • Joined on Thu, Sep 18 2008
    • Erlangen, Bavaria
    • Posts 1
    • Points 5
    Re: .pss Simulation Results Vary in Different runs (SpectreRF) Reply

    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

    • Post Points: 5
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Started by Maryam at 03 Sep 2008 02:47 PM. Topic has 1 replies.