RE: [SI-LIST] : Linpar 2-D field solver experiences?

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From: Neven Pischl (npischl@cisco.com)
Date: Wed Nov 22 2000 - 14:21:07 PST


Gary,

Linpar also gives the result as RLCG matrices, plus Zo and even and odd Z matrices, as well as velocity and attenuation.
The only thing I don't like with Linpar would be if I had to create my own geometry. I think it is an excellent tool, and to me it is worth much more that it costs (about $300).

Neven

At 01:25 PM 11/22/00 -0800, Gary Haussmann wrote:
>For standard single or differential tranmission line geometries, I
>prefer
>using linpar over building up a full complicated 3D model. The only
>problem
>I find is that the simulation output is not straightforward, especially
>for
>multiple lines. In my (admittedly old) version, you just get a dump of
>modal voltages and currents and have to interpret--or write a program to
>interpret--the output.
>
>We once did a cross comparison by calculating the characteristic
>impedence
>between linpar, Wheeler's equation for a microstrip, and a 3D field
>solver
>(LC). The three agreed well enough that I don't bother with the
>analytical
>approximation for "standard" linpar configurations, unless I'm
>cross-checking a configuration I haven't used before. Note that I didn't
>rigorously check impedence and crosstalk for buses with 3+ lines, so I
>can't
>comment on how accurately it handles that sort of analysis.
>
>Gary
>
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