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 Running AC analysis after certain time of transient analysis 

Last post Sun, Apr 21 2013 5:08 AM by Andrew Beckett. 3 replies.
Started by RFStuff 20 Apr 2013 10:15 PM. Topic has 3 replies and 1157 views
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  • Sat, Apr 20 2013 10:15 PM

    • RFStuff
    • Top 25 Contributor
    • Joined on Tue, Feb 5 2013
    • Posts 254
    • Points 4,505
    Running AC analysis after certain time of transient analysis Reply

     Dear All,

    One can run DC simulation at a particular instant of transient analysis.

    However, is it possible for the same for AC analysis ?

    In other words, I actulally want  as follows:-

    I want to run transient for 10 us after which the circuit enters into certain state.

    At this point I want to start AC analyis

    Is it possible and how it can be achieved ?

    Could anybody please tell.

    Kind Regards,

     

     

    • Post Points: 20
  • Sat, Apr 20 2013 11:38 PM

    Re: Running AC analysis after certain time of transient analysis Reply

    You need to use the acnames and actimes parameters on the transient options form. acnames is a list of the names of the analyses you wish to run (so "ac" in this case), and actimes is a list of the times during the transient that you wish to run them at.

    Regards,

    Andrew.

    • Post Points: 20
  • Sun, Apr 21 2013 4:59 AM

    • RFStuff
    • Top 25 Contributor
    • Joined on Tue, Feb 5 2013
    • Posts 254
    • Points 4,505
    Re: Running AC analysis after certain time of transient analysis Reply

     Dear Andrew,

    Thanks a lot.

    So the complete ac analysis expression (.ac Command) will be written in the "acnames"  or it will be written in the ac analysis ?

    That is :- Whether I have to enable ac analysis in the ac analysis form and give the frequency range and then go to acname type "ac"

    Is it the way ?

    Kind Regards,

     

    • Post Points: 20
  • Sun, Apr 21 2013 5:08 AM

    Re: Running AC analysis after certain time of transient analysis Reply

    I'm sure this must be in the documentation somewhere or even on this forum or on support.cadence.com and a search for "acnames" would probably have found it (I didn't try, but I'd be surprised if it's not somewhere)

    Anyway, fill out the ac analysis form as usual, and then that definition will be used during the transient (ADE netlists the instance of the ac analysis as being called ac too), and it's the instance name of the analysis you are referring to in the acnames parameter.

    See  also "spectre -h tran"

    BTW, spectre doesn't normally use ".ac" since that is the archaic SPICE syntax rather than spectre's own more regular syntax.

    Regards,

    Andrew 

    • Post Points: 5
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Started by RFStuff at 20 Apr 2013 10:15 PM. Topic has 3 replies.