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Monte Carlo Problem with Swept PSS and PAC

vjain83

I am following the example in SpectreRF manual to simulate IP3 using swept PSS and PAC combination. I added  output-referred IP3 as an output, using the Direct Plot form. When I run a nominal simulation using ADE L or XL, the IP3 output expression evaluates without any problem. But when I run a Monte Carlo analysis in ADE XL, the IP3 expression doesn't evaluate, and gives an error:

 "Results pac are not available for ....../psf/mc1_separate/002. Use results() for a list of available results."

 I also have other expressions using pss results. These evaluate correctly when I run the Monte Carlo without a pac analysis. But, when I include the pac analysis, 'some' of the pss-based expressions also fail to evaluate.

I searched on the Cadence support website etc, but couldn't find a solution that works. 

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  • Hi Vipul,

    I'm not sure why that is failing. I tried a very similar expression with my example, using IC615 ISR17 and MMSIM131 ISR2 (so one later than you):

    ipnVRI((v("/outp" ?result "pac") - v("/outm" ?result "pac")) '-2 '0 ?rport resultParam("load:r" ?result "pac") ?epoint -35 ?measure "Output")

    And it worked fine in Monte Carlo...

    Maybe it was a bug in that ISR - I don't have so easy access to that specific ISR at the moment since I'm at home for the Christmas break. Seems a bit unlikely though, but I know there have been some issues with the  result separation stuff for monte carlo, so maybe that's it?

    Can you check in the CIW:

    envGetVal("adexl.monte" "enableMonteCarloSeparateDir")

    and:

    envGetVal("adexl.monte"  "savedatainseparatedir")

    and:

    envGetVal("adexl.monte" "useNewMCPostProcessing")

    to see what they return? I'm expecting all three to return "t".

    Regards,

    Andrew.

Reply

  • Hi Vipul,

    I'm not sure why that is failing. I tried a very similar expression with my example, using IC615 ISR17 and MMSIM131 ISR2 (so one later than you):

    ipnVRI((v("/outp" ?result "pac") - v("/outm" ?result "pac")) '-2 '0 ?rport resultParam("load:r" ?result "pac") ?epoint -35 ?measure "Output")

    And it worked fine in Monte Carlo...

    Maybe it was a bug in that ISR - I don't have so easy access to that specific ISR at the moment since I'm at home for the Christmas break. Seems a bit unlikely though, but I know there have been some issues with the  result separation stuff for monte carlo, so maybe that's it?

    Can you check in the CIW:

    envGetVal("adexl.monte" "enableMonteCarloSeparateDir")

    and:

    envGetVal("adexl.monte"  "savedatainseparatedir")

    and:

    envGetVal("adexl.monte" "useNewMCPostProcessing")

    to see what they return? I'm expecting all three to return "t".

    Regards,

    Andrew.

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