[SI-LIST] Re: why do I need mixed mode S parameters?
- From: "Craig Clewell" <cclewell@xxxxxxxxx>
- To: <vince_cavanna@xxxxxxxxxxx>
- Date: Thu, 16 Sep 2004 05:12:09 -0800
Vince,
I've embedded my responses to your questions below
.
Q. What I am trying to understand is why I would ever want to use mixed
=
mode S parameters in a time-domain or frequency domain simulation, and =
how to use them.
A. As I believe Bill alluded to the mixed mode S parameters will allow
you to see if there is any asymmetry in the coupling. If there is than
you will have a larger cross mode coupling in one direction vs. the
other direction, meaning that you're differential to common mode will be
different in both directions. You may want to know this information for
a read/write line, or any other bi-directional line. This information
may be useful when you look at the affects of even and odd mode
switching on your system.
Q. I am also interested to learn what simulators support =
mixed mode S parameters directly, as using them in a simulator such as =
Hspice seems cumbersome. My approach today is to simply use standard S =
parameters directly.
A. As my friend and ex-compatriot Jim Nadolny pointed out you may only
have a model of the differential response. I am not aware of any
simulator that will allow you to import the mixed mode S parameters
directly other than HFSS? I always use the natural S parameters and
then post process if I need to see the other terms as you have pointed
out in your e-mail.
Regards,
Craig
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