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pnoise_pmjitter missing when running sweeps

Martin Cochet

Hello,

I am trying to run a pnoise jitter simulation in ADE Explorer (in Virtuoso ICADV12.3-64b) and I am encountering an issue when sweeping across corners.

When I run a single point I am able to get the desired waveform using the expression drplJitter(?result "pnoise_pmjitter" ?unit "Second" ?k 1 ?event 0)

However as soon as I try to run a sweep or corners simulation I get the following error

expression evaluation failed: drplJitter(?result "pnoise_pmjitter" ?unit "Second" ?k 1 ?event 0)
ERROR (WIA-1175): Cannot plot waveform signals because no waveform data is available for plotting.
One of the possible reasons can be that 'Save' check box for these signals are not selected in the Outputs Setup pane. Ensure that these check boxes are selected before you run the simulation

I was able to narrow down the issue to the saved results:

in single point mode, after opening the results with openResulrs("path/to/psf") results() returns:

(pss_td pss_fd pnoise_pmjitter variables)

When I do a sweep results() returns

(pss_td pss_fd pnoise pnoise_sb variables)

with no pnoise_pmjitter result. [The only difference between the 2 is if I do a single point vs 2 corners, nothing else changed]

I could not find any save option parameter that could be ticked to have pnoise_pmjitter saved as part of the results when running sweeps/corners.

Does anyone have an idea how to fix this?

Thanks in advance,

Martin

Parents

  • Hi Martin,

    Please give the exact IC version you're using (Help->About will give the full subversion number), plus the Spectre subversion (this will be at the top of the spectre log file). The reason I'm asking is that handling of Jitter analysis changed during that time frame and I want to ensure I both test the problem and give the right advice based on the sub-versions you're using.

    Thanks,

    Andrew.

  • in reply to Andrew Beckett

    Hi Andrew, thanks for the quick reply, here are the specific versions:

    For Virtuoso: ICADV12.3-64b.500.23

    For Spectre: Version 17.1.0.627.isr15_s02 64bit -- 10 Jun 2019

Reply Children
  • in reply to Martin Cochet

    Hi Andrew, as I'm sure you have a lot a lot on your plate, I will post directly a support ticket regarding this issue.

      I will post the answer from support on this post too for reference if someone else runs into the same problem in the future.

    Best,
    Martin

  • in reply to Martin Cochet

    Dear Martin,

    I was just wondering...in case this lends any insight into the issue...

    If you open the results for each individual simulation (as opposed to the ensemble of the two iterations) and issue the command results(), are the "pnoise_pmjitter" results present in each? In other words, is this possibly an issue with the ensemble result or is the result missing from a specific simulation within the set of 2 corner simulations.

    No need to respond if you are busy or my comment is not relevant in your opinion...

    Shawn

  • in reply to ShawnLogan

    Martin,

    I took a quick look (sorry, was busy the last few days to actually try it). It appears you have old expressions from before the new "sampled(jitter)" mode, and the results database now typically has these names:

    (pss_tran pss_td pss_fd pnoise_sample_pm0 model
      instance output designParamVals primitives subckts
      variables
    )

    I see that with both single runs and corner sweeps - it looks like you have (somehow) the old PM jitter analysis rather than the revamped jitter mode. Not sure why? The direct plot form generates different expressions now:

    rfJitter(?result "pnoise_sample_pm0" ?unit "Second" ?from 10 ?to 100000000 ?signalLevel "rms")
    rfJc(?result "pnoise_sample_pm0" ?unit "Second" ?from 10 ?to 100000000 ?k 1 ?multiplier 1)
    rfJcc(?result "pnoise_sample_pm0" ?unit "Second" ?from 10 ?to 100000000 ?k 1 ?multiplier 1)

    Probably best that you do indeed follow up with your support case as then we can see what's going on with your data. I wonder if it's related to a compatibility mode with the ADE setup having been created initially with an older version.

    Regards,

    Andrew.

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