RE: [SI-LIST] : Lossy line model

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From: Clewell, Craig W (ClewelCW@bergelect.com)
Date: Mon Mar 20 2000 - 05:46:26 PST


Alex....

Actually neither.

You might want to approach your problem from another angle...Try setting up
your geometry in a field solver first, and then export a T-Line model of
your stack. The output from your field solver can then be imported into
your ICAP/4 as a subcircuit.

If you don't have access to a field solver then you have 2 other choices.

1. Follow this link http://24.218.253.81/cgi-bin/FieldExtractor/ci.pl which
will allow you to simulate your stack on the www.

2. Get out you Wadell, Johnson, etc.. and hand crank the parameters you
need, and then use them to create your T-Line model in ICAP/4.

If you already have done the math and only want an opinion on which line to
use in ICAP then use the RLGC (shortcut 4o). This will allow you to account
for other losses in the line that the RC model does not include (its also
faster).

...just one approach....there are others...always glad to assist.

~Craig~

-----Original Message-----
From: Alex March [mailto:alx_march@yahoo.com]
Sent: Saturday, March 18, 2000 2:05 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Lossy line model

Hello,

  I am quite new to the SI field, and would like to
ask for your advice about the following topic:
I have to simulate differential transmission lines
(stripline) in a multilayer PCB, driven by a
differential transceiver with a rise time of 200ps.
  I am using the ICAPS4 software, which has two types
of models for lossy lines: the distributed URC/URD
model and the O element which uses the two-port LTRA
model.
  The question is which one of these two models are
better suited for this case? And how can I compute the
required parameters for making the model for my case
(stripline in FR4 dielectric).

Many thanks,

Alex

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