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Monte Carlo analysis with vprbs

Mirco Controller

Hi,

i have setup a testbench that contains a vprbs source. When running a monte carlo analysis with e.g. 200 points only the first point differs from previous started runs.

All other points are equal (min=max=mean). When i remove the vprbs source the mc-analysis works as expected.

The source has not to be connected (in fact i do a dc analysis). When changing the sampling method to "Low-Discrepancy Sequence" insted of "Random" it starts working again.

Is there a way to use the Random sampling method in combination with a vprbs source?

Version: IC6.1.6-64b.500.13

Best regards

Mirco

Parents
  • Andrew Beckett

    I believe this is the issue described in Presence of vprbs cell from analogLib affects Monte Carlo results

    The issue is fixed in MMSIM151 ISR10 or later (it's not the IC version that matters, but the MMSIM version). So you either need this hotfix of MMSIM151 or later, or any SPECTRE161 version.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    I believe this is the issue described in Presence of vprbs cell from analogLib affects Monte Carlo results

    The issue is fixed in MMSIM151 ISR10 or later (it's not the IC version that matters, but the MMSIM version). So you either need this hotfix of MMSIM151 or later, or any SPECTRE161 version.

    Regards,

    Andrew.

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