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 Extracting coupled nets to SigXP 

Last post Tue, Sep 12 2006 9:09 AM by archive. 3 replies.
Started by archive 12 Sep 2006 09:09 AM. Topic has 3 replies and 889 views
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  • Tue, Sep 12 2006 9:09 AM

    • archive
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    Extracting coupled nets to SigXP Reply

    I would like to be able to extract a victim net and two or four adjacent aggressors from PCB SI to SigXP to perform some detailed "what if" crosstalk experiments.  I know that I can build coupled topologies in SigXP, but to attempt to duplicate the net structure from PCB SI in SigXP would be incredibly time consuming.  At some point there was an app note that talked about using Specctraquest to create black box models for coupled nets, but I cannot seem to find it.

    Does anybody have any suggestions or comments?

    I am using PCB SI 610 15.7.


    Originally posted in cdnusers.org by drewd
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  • Fri, Sep 15 2006 11:39 AM

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    RE: Extracting coupled nets to SigXP Reply

    Hi Drew,

    The secret explained in that appnote was to get PCB SI to do the simulation you want and grab the interconn.spc file and stuff it into an Espice Black Box model for sigxp.  While that sounds simple enough, the bulk of the difficulty lies in getting the correct data from ntl_rlgc.inc also into the black box in the correct way.  It's do-able once you understand the technique explained in the appnote.

    There were actually a couple appnotes that explained this.  I'll browse the site to see if I can locate where it is now and will post the link if I find it.

    One caveat though.  Note that you won't be able to easily "what if" the interconnect crosstalk in the black box, but only whatever else you might draw around it.

    Hope that helps,
    Donald


    Originally posted in cdnusers.org by Donald Telian
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  • Fri, Sep 15 2006 11:46 AM

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    RE: Extracting coupled nets to SigXP Reply

    Found it under Articles->Modeling.  Here's the description:

    Describes a method for creating a black box model (DML) for three coupled differential pair. Using signal probe within Allegro PCB SI makes it possible to extract single-ended nets and differential nets into Sig-Xp. This document describes a method for creating a black box model (DML) for three differential pairs that are coupled to one another. This black box model can then be placed and used within Sig-Xp just as any other component. The same basic method used for this particular example could be used to create a black box model for any arbitrarily routed interconnect.


    Donald


    Originally posted in cdnusers.org by Donald Telian
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  • Mon, Sep 18 2006 10:02 AM

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    RE: Extracting coupled nets to SigXP Reply

    Thanks, Donald, that's what I was looking for.

    -Drew


    Originally posted in cdnusers.org by drewd
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Started by archive at 12 Sep 2006 09:09 AM. Topic has 3 replies.