Re: [SI-LIST] : inductor

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From: Muhammad S. Sagarwala (msagarwa@san-jose.tt.slb.com)
Date: Thu Sep 28 2000 - 11:10:10 PDT


I did not understand the last paragraph ..

>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.

Why do you think the current would still keep flowing in the inductor even
though it is in series
with the transmission line which gets hooked up to a receiver ???????

-----Original Message-----
From: Michael Nudelman <mnudelman@tellium.com>
To: Charles Grasso <chasgra@msn.com>
Cc: KokTongTHAM <kt_tham@uti2000.co.jp>; si-list@silab.eng.sun.com
<si-list@silab.eng.sun.com>
Date: Thursday, September 28, 2000 8:44 AM
Subject: Re: [SI-LIST] : inductor

>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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