[SI-LIST] Re: FW: Transmission Line Model Tests -resend
- From: "Muranyi, Arpad" <arpad.muranyi@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 27 Aug 2002 10:09:44 -0700
Paul,
Based on point 1d you will never get all these requirements
pass unless you are willing to give up all improvements, or
bug fixes after the first release...
Arpad Muranyi
Intel Corporation
===========================================================
-----Original Message-----
From: Guglielmi, Paul [mailto:paul.guglielmi@xxxxxx]
Sent: Tuesday, August 27, 2002 7:57 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] FW: Transmission Line Model Tests -resend
This is a a resend of a message I sent out on Friday when the si-list
was having problems. Please disregard the message if you have already
recieved it and have no interest.
Paul
-----Original Message-----
From: Guglielmi, Paul
Sent: Friday, August 23, 2002 9:09 AM
To: 'si-list@xxxxxxxxxxxxx'
Subject: Transmission Line Model Tests
We have been looking at several different lossy transmission line models
for use in our Spice simulations and have found that they all fail one
or more of the tests described below. We think it would be a good idea
if we could come up with a set of tests that the Spice vendors could use
to test their transmission models with to verify that they will give
correct answers. I am hoping that those on the SI-list would help define
a set of such tests and then encourage the Spice vendors to perform
these tests before they release new tool versions. This is my first cut
at such a list.
This list does not address the issue of what are the best copper or
dielectric loss models. That may be an issue that is better addressed in
another thread. A good simulator would allow a table driven model for
these loss parameters because what is best for one application will not
be the right thing for another application.
Transmission Line Model Tests
1. Model consistency tests
a. If a pulse that is wide enough that all transients on the
transmission line output should have died out is applied to a
transmission line then the transmission line should behave like a DC
resistance. Then the voltage out of the line will be equal to the pulse
voltage times the load resistance divided by the sum of the load
resistance plus DC transmission line resistance plus the source
resistance. A correct model must exhibit this behavior.
b. If a transmission line model is built by cascading "N"
identical transmission line segment models of length "L/N" then the time
and frequency domain response of that model should be identical to a
single segment model of length "L".
c. If a transmission line model is run on Spice simulator using
linear source and load models then its output waveforms should be
identical to that of the same model run on an FFT simulator. The driver
waveform must be the same in both cases. This tests that Spice is
getting correct answers.
d. If a transmission line model is run on different versions of
Spice it should produce identical results on all versions.
e. If different length transmission lines are simulated then they
should be well behaved. There should be no lengths which cause the
response to diverge towards infinite signal amplitude.
2. Model correlation with laboratory measurements
a. The time and frequency domain response of a transmission line
model of a test board should be identical to measurements made on the
test board. The test board model must include models for the connectors
used to connect to the test instruments.
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