[SI-LIST] Re: Preparing S-Parameters for Simulation
- From: wolfgang.maichen@xxxxxxxxxxxx
- To: "Timothy Coyle" <tim@xxxxxxxxxxxxxxxx>
- Date: Tue, 24 Feb 2009 10:38:09 -0800
Hi Timothy,
you may want to check out the IdEM tool
(http://www.idemworks.com/index.htm) - they put a lot of effort into
ensuring passivity and causality of their input data before creating any
macromodels.
Wolfgang
"Timothy Coyle" <tim@xxxxxxxxxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
02/24/2009 09:51 AM
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[SI-LIST] Preparing S-Parameters for Simulation
Hi,
I am working on a tutorial for the next issue of XrossTalk Magazine about
getting S-Parameter models ready for simulation. I see a lot of
S-Parameter
models from lab measurements and simulation tools that have a lot of
quality
issues (causality and passivity) and have to do a lot of clean up to make
them suitable for simulation. I have my own bag of tricks I use as well as
some good books on S-Parameter theory and application notes but I would
like
to hear from other people what their approaches are or some good
resources.
For some particular specifics review the list below:
. What considerations should go into setting up a simulation tool
to
extract an S-Parameter model? (bandwidth to be used, number of points,
importance of linear spacing of points, starting at DC, etc)
. A lot of tools will automatically "fix" causal and passivity
issues or enforce them. What's the pros and cons for this? What do
engineers
need to look out for when they do this?
. What's the best way to clean up a lab measured S-Parameter model
with poor resolution?
. What type of quality checks should you perform on an S-Parameter
model before simulating? (what do you look for in the S21 plots, do you
use
smith charts, ect?)
Thanks for any and all suggestions and links.
Best,
Timothy Coyle
Editor In Chief
XrossTalk Magazine
405 Western Ave #430
South Portland, ME 04106
Tel: 617.297.2566
Fax: 207.510.8099
Email: tim@xxxxxxxxxxxxxxxx
http://www.xrosstalkmag.com <http://www.xrosstalkmag.com/>
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