[SI-LIST] Re: Help - experience with Ansoft "F"dependentsources????
- From: "Neeraj Pendse" <cnepsc@xxxxxxxxxxx>
- Date: Mon, 03 Feb 2003 15:36:50 -0800
Hi Ed:
F elements are current-controlled-current-sources, and they are a way of
expressing mutual inductance. F elements are good for two reasons: (a)
It is easier to represent than K elements, because the direction of
coupling is hard to work out when you have n-coupled inductors. (b) Some
versions of SPICE have trouble when many mutual inductance elements are
in a circuit.
If you draw yourself a circuit diagram for the CCCS connections in a
simple SPICE subcircuit generated by Ansoft, you will realize that there
is no approximations made while using the F-element to represent mutual
inductnace ... ie it is a theoratically correct substitution. Just a
small arithematic excercise to figure out a transformation from K to F.
I believe Ansoft has a paper on this, I suggest you ask them to provide
you a copy.
Regards,
- Neeraj.
National Semiconductor Corporation
http://www.national.com, NYSE: NSM
> "Dr. Edward P. Sayre" wrote:
>
> Folks:
>
> Does anyone have specific experience of the satisfactory use of the Ansoft
> Maxwell "F" dependent source modes to model multiple coupled inductors. I
> am trying to do an RF crosstalk and transmission analysis using a Maxwell
> derived model in SPICE. The answers do not reduce to the correct answers at
> low frequencies or for that matter do they make sense at any other
> frequency. Range of operation I am looking at is 50 MHz thru 1 GHz.
>
> I am looking for the basic derivation of how the "F" model (Current
> controlled current source) expresses coupled inductors, or how it is
> related to the coupled transformer coupling coefficient "k" which is the
> more conventional way of expressing coupled inductors.
>
> Thanks in advance -
>
> ed sayre
>
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> | NORTH EAST SYSTEMS ASSOCIATES, INC. |
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> | Dr. Ed Sayre e-mail: esayre@xxxxxxxx |
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> | 5 LAN Drive, Ste 200 Fax +1.978.392-8686 |
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2900 Semiconductor Drive, M/S 19-100
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