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 PAC Magnitude? Cadence Acronym Guide? 

Last post Wed, May 30 2012 2:04 PM by Andrew Beckett. 2 replies.
Started by SeriousTyro 29 May 2012 05:07 PM. Topic has 2 replies and 2984 views
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  • Tue, May 29 2012 5:07 PM

    • SeriousTyro
    • Not Ranked
    • Joined on Mon, May 21 2012
    • Arcadia, CA
    • Posts 4
    • Points 50
    PAC Magnitude? Cadence Acronym Guide? Reply

    Hi all,

     I am following a analysis tutorial for a gilbert cell and one of the fields for a port is PAC Magnitude. What does PAC refer to?

    I don't want to keep asking questions for trivial things like this. Is there a Cadence Manual containing information like this?



    • Post Points: 20
  • Wed, May 30 2012 9:43 AM

    • Tawna
    • Top 25 Contributor
    • Joined on Fri, Jul 11 2008
    • Snohomish, WA
    • Posts 212
    • Points 5,625
    RE: PAC Magnitude? Cadence Acronym Guide? Reply
    Hi William,

    We have not published yet a formal “acronym guide” for Spectre/SpectreRF.

    PAC is periodic AC analysis.  It is similar to AC analysis (except that AC is linearized about a DC operating point).  PAC is linearized (or small-signalized) about a periodic operating point.   PAC magnitude is the magnitude of the Periodic AC signal.

    There are a couple of places where you can get more information on PAC and simulating circuits that translate frequency (mixers, oscillators, etc.)

    1.      The SpectreRF User Guide can be located online at http://support.cadence.com


    2.      You can also access the same documentation using the command in your xterm:

    cdnshelp  &

    Note that you will want to use the cdnshelp from the MMSIM hierarchy, e.g.

    /grid/cds/software/MMSIM111ISR/tools/bin/cdnshelp &

    3.      Finally, you can also access the documentation in pdf format by going to:


    Note that the path to your software hierarchy may be different than the above at your particular site.  Your system administrator should be able to assist you with the correct path.

    If you are a newer user, it will be well worth your time to look on Cadence Online Support (http://support.cadence.com) for Solutions, AppNotes, etc.

    Finally, another source of information (locations of tutorials, etc) can be found in this blog post:

    SpectreRF AppNotes and Tutorials....Still One of our Best Kept Secrets! - RF Design - Cadence Community

    Best regards,
    Best regards, Tawna Wilsey Staff Support AE, Global Customer Support Cadence Design Systems, Inc.
    • Post Points: 20
  • Wed, May 30 2012 2:04 PM

    Re: RE: PAC Magnitude? Cadence Acronym Guide? Reply

    Indeed, in cdnshelp you could even search for "PAC Magnitude" and get an explanation...

    Radical, eh?


    • Post Points: 5
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Started by SeriousTyro at 29 May 2012 05:07 PM. Topic has 2 replies.