Re: [SI-LIST] : even-odd mode influence

jonp@pacbell.net
Fri, 16 Jul 1999 07:17:24 -0700

XTK from Viewlogic has a "truly distributed" "Multi-conductor" model and does even and odd mode just fine (and has for a decade, thank you), but I think that just about all of the Non-spice simulators support this level of coupled
system simulation (not to say that you can't do it in SPICE too, of course). This sort of effect is crucial to accurate crosstalk simulation.

WAUGH,RAY (HP-SanJose,ex1) wrote:

> Guys...
>
> Field solver software??? I'd be careful about going down that road to
> answer a relatively simple question. Such software is very expensive and
> takes a great deal of understanding (of e-m theory) to use. I am a
> RF/microwave circuit designer with an electromagnetic theory background, and
> I know of very few of my kind who can use such a tool effectively.
>
> As Adrian Shiner put it so accurately, "...you get both in some proportion
> no matter how you think you have designed in one mode."
>
> Ray Waugh
>
> _/ Raymond W. Waugh - WSD Diode Applications
> _/ E-mail: ray_waugh@hp.com
> _/_/_/ _/_/_/
> _/ _/ _/ _/ USPS : Wireless Semiconductor Division
> _/ _/ _/_/_/ 39201 Cherry Street, MS NK20
> _/ Newark, California 94560
> _/
>
> -----Original Message-----
> From: jaydiep@us.ibm.com [mailto:jaydiep@us.ibm.com]
> Sent: Thursday, July 15, 1999 1:49 PM
> To: si-list@silab.eng.sun.com
> Subject: [SI-LIST] : even-odd mode influence
>
> Weber,
>
> To be able to simulate even-odd mode effects, you'll have to model the
> conductors as a system of coupled transmission lines. There are not many
> simulators that can do it, and even the ones that can are pretty limited to
> the
> number of conductors they can handle. Many of them can only handle lumped
> models, where what you really need to see what's going on is a true
> distributed
> model. You'll need a field solver to extract the coupled transmission line
> matrices - it's not easily done analytically. Take a look at Ansoft,
> Applied
> Simulation Technology, and Pacific Numerix. HSPICE can model coupled lines
> using geometric input (conductor size, spacing, etc.), but I can't vouch for
> its
> accuracy.
>
> Jay Diepenbrock
>
> Senior Engineer
> Interconnect Technology & Qualification
> IBM Global Procurement, B8UA/061, RTP, NC
> Phone: 919-543-8804 Fax: 919-543-3642
> Email: jaydiep@us.ibm.com
>
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