FreeLists / si-list / [SI-LIST] Re: Modeling and measurement of power distribution system

["Fabrizio Zanella" <fzanella@xxxxxxxxxxxx>]

Tegan, if you're just looking for an Excel file, on of Itsvan Novak's
spreadsheets can handle multiple capacitors, at
http://home.att.net/~istvan.novak/. =20
I agree that the PDS modeling tools are expensive, but there doesn't
seem to be a better option.
The HP 4195 network analyzer will work for measuring the impedance vs.
frequency of the power planes, I used it recently with the 41951
impedance test adapter.  A good calibration should result in good,
repeatable measurements.=20

Regards, Fabrizio Zanella

-----Original Message-----
From: Tegan Campbell [mailto:Tegan.Campbell@xxxxxxxxxxx]=20
Sent: Friday, December 05, 2003 3:27 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Modeling and measurement of power distribution system

All,
I have been asked to come up with a simulation and measurement system
for
the PDS on multilayer printed circuit boards.  In researching the
project,
it looks like the only really viable alternative is to use a
commercially
available modeling package and a network analyzer to make a two port
measurement.
The first stumbling block is the price of the packages for power system
modeling.  I am looking for a tool that is less than $1K which allows
the
use of multiple values of multiple caps and their associated parasitic
characteristics.  I have seen some alternatives in the archives of this
list, but all seem to be $$$.  The other route would be to make my own
with
excel, but the time required is too great.  Any suggestions?

The measurement side is coming together, but I have a couple questions.
I
am not very familiar with S-parameters, but the combined reading of
Agilents
app notes/white papers on the subject and Istvan Novaks paper on
two-port
S-parameters measurements have helped immensely.  I blew the dust off a
4195A network analyzer, and have come up with one 41952A transmission
test
set. =20

Before I spend the money for another(for the two port measurement) I was
wondering if anyone has any experience with this measurement technique.
The
8720D used in Istvan's paper has better specs, but it seems like the
4195
can get the job done if I can connect it correctly.  The frequencies of
interest right now are <1GHz, and I think with a bit of thinking the
500MHz
limit on the 4195 will not be a major handicap.  I am thinking that the
plane capacitance will be the main source of impedance/decoupling above
~150-200MHz, and thus should be predictable out to 1GHz from a
measurement
that stops at 500MHz. =20

If you see a problem with the assumptions or method described(vaguely,
sorry
about that, but I'm still getting it straight in my head) any
suggestions
would be greatly appreciated.

Thank you for your time,
Tegan Campbell
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