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Print Noise Summary after Pnoise Simulation(timedomain)

charlieWu

Hi Everyone,

I need to simulate the noise of my circuit by using pnoise analysis, which is shown as below:

unsmpldNoise out 0 pnoise start=0.1 stop=10/t_period maxsideband=200
smpldNoise  out 0 pnoise start=0.1 stop=0.5/t_period maxsideband=200 \
noisetype=timedomain noisetimepoints=[3.7u 7.65u] \
numberofpoints=1

and I would like to check the noise contribution by noiseSummary function.I can get the noise contribution successfully when i transfer the result of "unsmpldNoise"(timeaverage"mode) into noiseSummary function,but I can't get the noise contribution when i transfer the result of "smpldNoise"(timedomain"mode) into noiseSummary function.

I have surveyed the discussion before( https://community.cadence.com/cadence_technology_forums/f/custom-ic-design/36394/print-noise-summary-after-analysis-during-tran )and  the ocean script that I used is shown as below:

noiseSummary('integrated
?resultsDir "xxx.raw"
?result "smpldNoise-timedomain.pnoise"
?truncateType 'top
?truncateData 20
?from 1e3
?to 2e3
?paramValues '"7.65e-6"
?noiseUnit "V"
)

then I get the message "ERROR (OCN-6025):Value of 7.65e-6 for 'timeindex' sweep variable is not found. For further information,type ocnHelp('sweepVarValues) in the Command Interface Window (CIW).", therefore I check what value I have:  

sweepNames()
=>("timeindex" "freq")

sweepVarValues("timeindex")
=>(0.0 3.7e-06 7.65e-06)

I wonder that " 7.65e-06" is one of the value of  "timeindex" indeed, and why the message will show "Value of 7.65e-6 for 'timeindex' sweep variable is not found"? 

Or I can't use noiseSummary for pnoise "timedomain" mode?

Thanks

  • Note I didn't re-test this because I must have tried it at the time when I wrote the reply to the other thread you mentioned. I see that you have specified the ?paramValues argument as a quoted string (which is a bit odd) and it is supposed to be a list. That may well be the reason...

    In the other thread I show:

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

    Whereas you have:

    ?paramValues '"7.65e-6"

    Try making it:

    ?paramValues list(7.65e-6)

    or

    ?paramValues '(7.65e-6)

    Andrew

  • in reply to Andrew Beckett

    Hi Andrew,

    I have tried both "?paramValues list(7.65e-6)" and "?paramValues '(7.65e-6)"

    I get the message " *Error* drWaveformGetDimension: argument #1 should be any user-defined (other) type (type template = "o") - nil " both.

    But I don't understand the meaning of the message...

    I found the description of ?paramValues(it is a bit odd that ?paramValues is not shown in "noiseSummary" function) in ocean ref (http://home.engineering.iastate.edu/~yulong/EE501lab/Cadence%20ocean%20ref.pdf) is "List of values for swept parameters" ,maybe "timeindex" is not the "swept parameters"?

    Thanks 

  • in reply to Andrew Beckett

    Hi Andrew,

    I tried ?paramValues '(7.65e-6) again in another version, it works!

    Thanks for your help.

     

  • in reply to charlieWu
    charlieWu said:
    I tried ?paramValues '(7.65e-6) again in another version, it works!

    That's why it matters to mention the version you're using.

    You also referenced a VERY old version of the documentation (which actually is breaking the license agreement to publish online - so it may end up being removed). Referencing a 20-year old version of the documentation makes no sense; the documentation is shipped with the software, so you should look at that. Either run $CDSHOME/bin/cdnshelp or look at $CDSHOME/doc/oceanref/oceanref.pdf (I'm just using $CDSHOME to reference wherever your Virtuoso software is installed). It is definitely covered in the current documentation.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Hi Andrew,

    Thanks for your opinion, I will check the latest oceanref at the path you said.

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