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Print Noise Summary after "ANALYSIS DURING TRAN"

msharma

Hi,

I need to simulate the noise of my circuit at specific points in time after transient analysis. For this I use the "ANALYSIS DURING TRAN", (analysis->tran->options-?output->"ANALYSIS DURING TRAN"). I specifiy a time in actimes, and specify acnames = noise. The analysis runs successfully. However, I am unable to use the "Print Noise Summary" feature. When choosing Print Noise Summary, no dialog pops up, just an empty result window.

How can I use the "Print Noise Summary" feature when running noise analysis at specific tran points?

Thanks,

Mohit

Parents

  • Hi Mohit,

    The problem is due to the version of MMSIM13.1 you're using. Doing some experiments with IC616 ISR1 (the version you're using), and MMSIM131 ISR9 (the version you're using), I see the problem. I see that it first broke in MMSIM131 ISR8 (13.1.1.117.isr8) and was working again in MMSIM131 ISR14 (13.1.1.420.isr14). It's possible that it was fixed in ISR13 too - I don't have that version lying around to test. This fixed version is about 2 years old, so using something more recent makes sense.

    There was clearly a difference in how the results were presented which causes the problem.

    You may be able to workaround this by using the noiseSummary function instead in the CIW. After simulation, check what sweep values you have (these should be the times):

    selectResult("tran_noise-tran_noise")
    sweepValues()

    In my case I get: (1.3e-06 1.9e-06)

    Then I can do:

    noiseSummary('spot ?result "tran_noise-tran_noise" ?frequency 1k ?paramValues list(1.9e-6))

    noiseSummary('integrated ?result "tran_noise-tran_noise" ?from 1k ?to 1G ?paramValues list(1.3e-6))

    noiseSummary('integrated ?result "tran_noise-tran_noise" ?from 1k ?to 1G ?paramValues list(1.3e-6) ?output "noiseSummary.txt")

    The ?paramValues needs to be one of the times you had from the sweepValues() call.

    The problem seems to be with this range of MMSIM versions that the results are called "tran_noise-tran_noise" and are not picking up the "aliased" name of "noise" which is what the noise summary form is expecting. By calling the underlying OCEAN (SKILL) function, you can tell it the result result name.

    Regards,

    Andrew.

Reply

  • Hi Mohit,

    The problem is due to the version of MMSIM13.1 you're using. Doing some experiments with IC616 ISR1 (the version you're using), and MMSIM131 ISR9 (the version you're using), I see the problem. I see that it first broke in MMSIM131 ISR8 (13.1.1.117.isr8) and was working again in MMSIM131 ISR14 (13.1.1.420.isr14). It's possible that it was fixed in ISR13 too - I don't have that version lying around to test. This fixed version is about 2 years old, so using something more recent makes sense.

    There was clearly a difference in how the results were presented which causes the problem.

    You may be able to workaround this by using the noiseSummary function instead in the CIW. After simulation, check what sweep values you have (these should be the times):

    selectResult("tran_noise-tran_noise")
    sweepValues()

    In my case I get: (1.3e-06 1.9e-06)

    Then I can do:

    noiseSummary('spot ?result "tran_noise-tran_noise" ?frequency 1k ?paramValues list(1.9e-6))

    noiseSummary('integrated ?result "tran_noise-tran_noise" ?from 1k ?to 1G ?paramValues list(1.3e-6))

    noiseSummary('integrated ?result "tran_noise-tran_noise" ?from 1k ?to 1G ?paramValues list(1.3e-6) ?output "noiseSummary.txt")

    The ?paramValues needs to be one of the times you had from the sweepValues() call.

    The problem seems to be with this range of MMSIM versions that the results are called "tran_noise-tran_noise" and are not picking up the "aliased" name of "noise" which is what the noise summary form is expecting. By calling the underlying OCEAN (SKILL) function, you can tell it the result result name.

    Regards,

    Andrew.

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