Re: [SI-LIST] : inductor

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Thu Sep 28 2000 - 08:24:48 PDT


An inductor as a terminator...khm...why not just terminate the line?

Plus, do not forget - the transmission line effects are Only for transition
process (front). Once it stops, and the line is not terminated - the current
doesn't flow (infinite resistance of receiver).
If the inductor is in series with the transm. line (I would imagine so, since
you want to slow down the front) here what happens:

The initial current flows into transmission line through the inductor (tr. line
is a resistor for the duration of the front). Then when the transition stops and
everything calms down, the current still flows in the inductor, creating a
overshoot. Potentially it can be bad enough overshoot to damage something.

Charles Grasso wrote:

> I most certainly would not recommend that. Add the correct termination
> and watch the ringing disappear! The inductor will add delay and more than
> likely exacerbate the ringing.
>
> I know that some folks add ferrites in place of series resistors and I would
> like
> to have a discussion on that. Comments?
> ----- Original Message -----
> From: "KokTongTHAM" <kt_tham@uti2000.co.jp>
> To: <si-list@silab.eng.sun.com>
> Sent: Thursday, September 28, 2000 3:07 AM
> Subject: [SI-LIST] : inductor
>
> > SI Gurus,
> >
> > I have told by an EMI engineer about using inductors can reduce ringing of
> > a transmission line effectively instead of series resistor. Can anyone
> > tell if this is true?
> > As far as I know, inductor can act as a filter to cut unwanted harmonnics.
> > How do we chose the suitable value for the inductor?
> >
> > Thanks.
> >
> > Regards,
> > KTTHAM
> >
> >
> >
> >
> >
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