Re: [SI-LIST] : Ferrite Bead models

Ron Miller (rmiller@Brocade.COM)
Wed, 24 Mar 1999 14:27:49 -0800

Hi Fred

Thanks for the info on Contec spice. We evaluated it at Schlumberger
ATE
about 4 years ago only to find that at that time it assumed a fixed
attenuation
constant at some frequency which it applied linearly across the
frequency band
rather than a different attenuation at each frequency which is implied
for frequency
dependent losses as in cables.

Incidentally I got a reply on this forum of a spice derivitave with uses
a FFT of the
S-parameter file. I have asked for additional information. If you want
this info also
lets go off-line with this discussion.

Ron Miller

Fred Balistreri wrote:

> .-----Original Message-----
> >From: Ron Miller
> >To: si-list@silab.eng.sun.com
> >Date: Tuesday,
> >March 23, 1999 9:40 AM
> >Subject: Re: [SI-LIST] : Ferrite Bead models
>
> > Mr Grasso
> >Since the ferrite beads performance changes radically with
> >frequency, the best model would be an S-parameter file. However,
> >the frequency domain simulators (HP and Compact) are the only
> >ones that can use S-parameters as models.
>
> Not quite true. Applied Simulation Technology has a program that reads
> in
> S parameters and generates frequency dependent models for ApsimSPICE
> formally
> known as ContecSPICE. The program has been in good use since about 1994.
> Although
> not as popular as microwave products such as Touchtone and the like the
> program is better suited for Digital Applications where the model can
> be easily used with
> non-linear models such as IBIS or SPICE level. This would be equivalent
> of using for example
> Microwave SPICE except the S parameters can be accounted for and
> transmission line
> analysis is much improved than the versions of SPICE developed in the
> 1970's or 80's.
> You can check it out at www.aspimtech.com. We also attend many trade
> shows like PCB conference
> or Design Con.
>
> Fred Balistreri
> Applied Simulation Technology
>
> >A distant second would be the bahavioral models.
>
> >Ron Miller
>
> >> Does any one out there have a model (usable in Spice) for a ferrite bead?
>
> >>Thank you
>
> >> Charles Grasso
> >>Advisory Engineer
> >>StorageTek 2270Sth 88th Street Louisville CO 80027
> >>M/S 4247 Tel:303-673-2908=20 Fax:303-661-7115=20
> >>email:grassc@louisville.stortek.com
> >>Web Site: http://www.ewh.ieee.org/r5/denver/rockymountainemc/
>
> >-- Ronald B. Miller _\\|//_ Signal Integrity Engineer (408)487-8017 (' 0-0 ') fax(408)487-8017
>
> > Brocade Communications Systems, 1901 Guadalupe Parkway, San Jose, CA 95131
> >rmiller@brocade.com, rbmiller@sjm.infi.net
>
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--
Ronald B. Miller  _\\|//_  Signal Integrity Engineer
(408)487-8017    (' 0-0 ') fax(408)487-8017
     ==========0000-(_)0000===========
Brocade Communications Systems, 1901 Guadalupe Parkway, San Jose, CA 
95131
rmiller@brocade.com,  rbmiller@sjm.infi.net

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