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 pss+pnoise analysis failure in Monte Carlo Simulation 

Last post Wed, Feb 10 2010 10:48 PM by SonerYaldiz. 2 replies.
Started by SonerYaldiz 27 Jan 2010 09:25 PM. Topic has 2 replies.
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  • Wed, Jan 27 2010 9:25 PM

    pss+pnoise analysis failure in Monte Carlo Simulation Reply

    Hi,

    I am trying to run a Monte Carlo simulation of a 25GHz LC-VCO (vco followed by an ac-coupled buffer) for phase noise (mmsim-7.11, pss (harmonic balance) and pnoise). When I try a single run (no variability), the simulation finishes successfully without any errors or warnings. When I try running a Monte Carlo simulation (with process and mismatch), I am having one of the problems described below randomly (depending on the seed and starting run#). By the way,  when I try to run a transient analysis in a Monte Carlo simulation with the same samples, the simulation finishes successfully. Could you please help?

    1) After the first few samples, the simulator stops/freezes without any error messages in the output log. 

    2) At the first sample, I got the error message: "ERROR SPECTRE-16192: No convergence achieved with the minimum time step specified". I think this happens during the tstab. However the transient simulation does not have any convergence problems with the same set of samples.

    Could you please help?
    • Post Points: 20

  • Wed, Jan 27 2010 11:14 PM

    • Tawna
    • Top 50 Contributor
    • Joined on Thu, Jul 10 2008
    • Snohomish, WA
    • Posts 147
    • Points 4,180
    Re: pss+pnoise analysis failure in Monte Carlo Simulation Reply

    Hi SonerYaldiz,

    You didn't mention what subversion of MMSIM 7.1.1 you were using.  If you are simulating with BSIMSOI devices, there is a known issue that is described in support.cadence.com Solution 11588618 which is fixed in the latest MMSIM 7.1.1 ISR available on downloads.cadence.com . 

    If the latest ISR doesn't resolve this issue, I recommend contacting Cadence Customer Support and filing a Service Request, attaching your spectre output logfile to the SR. 

     

    best regards,

    Tawna Wilsey

    Best regards, Tawna Wilsey Staff Support AE, Global Customer Support Cadence Design Systems, Inc.
    • Post Points: 20

  • Wed, Feb 10 2010 10:48 PM

    Re: pss+pnoise analysis failure in Monte Carlo Simulation Reply

    Hi Tawna,

    The latest ISR resolved the issue.

    Thanks and regards,

    Soner Yaldiz

    • Post Points: 5
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Started by SonerYaldiz at 27 Jan 2010 09:25 PM. Topic has 2 replies.