[SI-LIST] Re: Ringing in Lumped & Distributed Circuits
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Rajan Hansa <all.si.list@xxxxxxxxx>
- Date: Tue, 17 May 2011 04:43:42 -0700
Rajan,
An ideally terminated transmission line has zero reflection. Therefore
no energy is stored in reflections.
In the idealized case the mechanism for the ringing is different. An
ideal, zero size lumped resonator moves energy between electric and
magnetic fields. A transmission line resonator moves reflected energy
between the media discontinuities.
Steve.
On 5/17/2011 4:35 AM, Rajan Hansa wrote:
>
> Hello Steve,
>
> Thanks for your reply but I am sorry that I am not able to relate it
> with electrical circuits.
>
> Do you mean to say that distributed electrical circuits ring even if
> it's properly terminated ?
>
> Does ringing phenomenon ( overshoot&undershoot) in lumped circuit is
> different than distributed circuit ?
>
> Rgds,
>
> Rajan
>
>
>
> On Tue, May 17, 2011 at 4:53 PM, steve weir <weirsi@xxxxxxxxxx
> <mailto:weirsi@xxxxxxxxxx>> wrote:
>
> Rajan,
>
> Distributed networks most definitely can and do ring. Earth's
> atmosphere up to the ionosphere makes a great example: the
> Schumann Resonance at just under 8Hz.
>
> Steve
>
>
>
> On 5/17/2011 3:53 AM, Rajan Hansa wrote:
>
> Hello Experts,
>
>
> I have a problem understanding ringing concept in lumped and
> distributed
> circuits. What I have learned that lumped circuits may or may
> not ring
> depending on the Q of the circuit but distributed circuits
> with terminated
> load will not have any ringing.
>
>
>
> where Q for RLC circuit = (L/C)1/2 /R
>
>
>
> I would like know :
>
>
>
> 1) Why Q is not important in distributed circuits ? If
> it?s important
> then how termination resistor affects Q in distributed circuit ?
>
>
>
> 2) Is ringing phenomenon ( overshoot& undershoot) in
> lumped circuit is
> different than distributed circuit ?
>
>
>
> Rgds,
>
> Rajan
>
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> Steve Weir
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>
--
Steve Weir
IPBLOX, LLC
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