Re: [SI-LIST] : Frequency or time domain for component characterization

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From: Steve Corey (steve@tdasystems.com)
Date: Mon Feb 28 2000 - 15:19:10 PST


Hi Kai,
  In my opinion and experience, the quality of the model correlates more with the knowledge and skill of the modeler than with the domain in which the extraction is performed. Whether someone prefers a time-domain or frequency-domain approach for modeling at frequencies of less than say 15GHz seems to depend in large part on what they are most accustomed to working with, both in terms of measurment instrumentation and available software tools.

You haven't mentioned why you consider the models you received to be "dubious", but if you have good reason to doubt them, I would suggest connecting a sample to a TDR (since you seem to prefer a time-domain approach) and verifying them yourself. A bit painful, but if you're the paranoid type like I am, it helps you to sleep at night...

--
-------------------------------------------
Steven D. Corey, Ph.D.
Time Domain Analysis Systems, Inc.
"The Interconnect Modeling Company."
http://www.tdasystems.com

email: steve@tdasystems.com phone/fax: (206) 417-3439 -------------------------------------------

> Kai Keskinen wrote: > > Hi Folks: > > I'm in the interconnect group where connectors are our thing. I'm the high speed modeling guy. I take those connector spice models and make sure the connector will work with our drivers/signal paths/receivers. I have a lot of experience with connector models made using TDR measurements. I have recently been sent some models that appear somewhat dubious. The vendor group that made the measurements says they only use a network analyzer and then do the inverse fft and some other tricks to get the time domain. They have some way to fit parameters to a model to get a match to their measurements. My question is, is the frequency domain method as good as using the TDR at various edge rates? > > Thanks in advance for your comments. > > Kai Keskinen > Equipment and Network Interconnect > Nortel Subsystems and Performance Networks (NSPaN) > (613)-765-3506 (ESN 395) > keskinen@nortelnetworks.com

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