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Different Monte Carlo Setups in the same run/run plan (Maestro)

jackrc11

I am trying to test different monte carlo setups where

- In one test (call this nominal) design variables (such as the supply voltages) are kept constant and only device parameters are changing with the monte carlo sim

- In other tests, I want some design variables to also change with the monte carlo sim (just to have fewer total runs than having each variable as a corner).

However, I cannot seem to find a way to have multiple different monte carlo setups across one file in maestro. From what I have seen,

- There is not an option to just add a second monte carlo setup under an existing one

- If using ADE Assembler, it is not sufficient to use multiple tests. Changing the monte carlo setup in one test will change it in the other test.

- A Run Plan is insufficient for the same reason- changing the monte carlo setup in one run will change it for all other runs.

Is there any way around this, or is the best option just to do a run, change the monte carlo setup, then run it again?

  • Andrew Beckett

    You should be able to set the Monte Carlo settings for each run plan - so if you have multiple run plans running Monte Carlo, they can have different Monte Carlo options (right mouse button over the run mode in the run plan). Which IC sub-version are you using (type getVersion(t) in the CIW or look  at Help->About in any window and report the full version number you see there.

    Andrew

  • jackrc11
    in reply to Andrew Beckett

    Thank you for the prompt response, Andrew. I am running sub-version  ICADVM20.1-64b.500.25.EHF10941. I have checked again (on a quick test with fewer runs) and seen that Monte Carlo Sampling keeps some (but not all) changes. In my case, I am trying to have one run where some Design Variables have statistical variation and another (typical) run where they do not. If I enable or disable "Specify Design Variables" in one run, it will set the other run to the same setting. This seems to not happen with other fields (for example, if I change the Number of Points or Seed in a run, the other run will not change). 

  • Andrew Beckett
    in reply to jackrc11

    I think that's probably an oversight - the ability to specify distributions in the UI for statistical variables is a fairly recent addition and it seems that it's not been scoped to the run plan.

    You should contact customer support to see about getting this fixed.

    Andrew

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