[SI-LIST] Re: How to explain reflection in circuit?
- From: Faraydon Pakbaz <pakbazf@xxxxxxxxxx>
- To: ransom@xxxxxxxxxxxxxxxx
- Date: Fri, 17 Aug 2012 07:48:25 -0400
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In Summary every rule has an exception and definition of bad and good
impedance is relative and fuzzy.....
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All this wave stuff, and all the concepts you derive from S-parameters
(aka,
scattering theory) applies to any kind of wave phenomena. A great examp=
le
is
the impedance mismatch at the mouth of a bay and how the tide in the ba=
y
leads or lags the tide in the ocean outside the bay.
You can get crazy phenomena when the bay and the ocean match impedance,=
resonance at the tidal period which amplifies the tidal surges. Crazy
stuff.
Same with acoustics and musical instruments. Sometimes you want impedan=
ce
mismatches to encourage reflections that generate reverb or damp feedba=
ck.
And light. A rainbow is just a bad impedance match causing frequency
dependent RL that looks pretty.
Go forth and pontificate!
(word to the wise, though: the word "impedance," spoken in polite socie=
ty
can be misunderstood as "impotence" which can be fun when carefully
applied).
_____________________________
Ransom W. Stephens, Ph.D.
Content and Analysis
www.ransomsnotes.com
http://www.tmworld.com/electronics-blogs/4390520/Measure-of-Things
Measure of Things: science from the perspective of a technologist,
technology from the perspective of a scientist
Twitting @ransomstephens
LinkedIn, Facebook and all that stuff
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxx=
rg]
> On Behalf Of A. Ingraham
> Sent: Thursday, August 16, 2012 1:08 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: How to explain reflection in circuit?
>
> > Analog to the electromagnetic wave hit another matter, if the wave
> > impedance of new matter is different, there will be refelection.
> > what about the wave in circuit, will it hit the surface of resistor=
.
> will
> > the resistor show itself as a wave impedance?
>
> It all works the same, whether you are talking about a physical
> resistor or a transmission line of some characteristic impedance. In=
> a very compact circuit or at low enough frequencies, the transmission=
> lines may be short enough so that we don't need to worry about the
> reflections, but they may be there anyway whenever there is a
> mismatch.
>
> Andy
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