RE: [SI-LIST] : Your experience with equivalent circuit modeling tools ...

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From: zanella, fabrizio (zanella_fabrizio@emc.com)
Date: Wed Mar 15 2000 - 10:55:43 PST


I concur with Weston Beal's statements. What we do is push hard on the
ASIC, FPGA, connector vendors to supply accurate models of their packages
and connectors. It's their responsibility to create the equivalent circuit
models. We do use the TDA Iconnect software, linked with the TDR, to create
equivalent circuit models when one is not available from the vendor or to
verify certain models.
Regards,
Fabrizio Zanella
Hardware Engineering
EMC Corporation
508-435-2075, x14645
FAX: 508-497-8027
fzanella@emc.com

                -----Original Message-----
                From: Weston Beal [mailto:weston_beal@mentorg.com]
                Sent: Friday, March 10, 2000 12:02 PM
                To: si-list@silab.eng.sun.com
                Subject: RE: [SI-LIST] : Your experience with
equivalent circuit modeling tools ...

                Christian,

                Most SI engineers are involved in digital designs. As such,
these teams
                usually don't have time nor expertise to create their own
models of
                interconnects and components. The majority of SI work is
done with whatever
                model the engineer can get ahold of in a moment of need.
Some of these come
                from a vendor. Some are just approximations from a
datasheet or guesses
                made from experience. There are nice modeling programs
available, but few
                people who have the money and the time and the knowledge to
use them
                effectively.

                Now, if there is someone who doesn't work like this, we'd
like to hear about
                it.

                Regards,
                Weston

                -----Original Message-----
                From: owner-si-list@silab.eng.sun.com
                [mailto:owner-si-list@silab.eng.sun.com]On Behalf Of
Christian Schuster
                Sent: Friday, March 10, 2000 5:42 AM
                To: si-list@silab.eng.sun.com
                Subject: Re: [SI-LIST] : Your experience with equivalent
circuit
                modeling tools ...

                Dima, Ray,

                thanks for your input! However, the relative small number of
                replies leads me to the conclusion that most SI-List
listeners
                have little experience with equivalent circuit modeling
tools.
                So, I would like to ask how you all usually extract circuit
                models for e.g. interconnects, packages etc. ? Do you rely
                e.g. on formulas as found in textbooks like the
"Transmission
                Line Design Handbook" from Wadell?

                Thanks in advance, best regards,

                Ch. Schuster

> > Dear SI-List,
> >
> > I would like to know if anybody of you has some
experience
> > with equivalent circuit modeling tools, i.e. software
tools
> > that generate (more or less) automatically equivalent
circuit
> > models from e.g. scattering parameter measurents or
> > electromagnetic field simulation data. Do you get
reliable
> > models in a decent time? What tools are "state of the
art"?
> >
> > Thanks in advance, best regards,
> >
> > Ch. Schuster

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