[SI-LIST] Doug Brooks's Question
- From: Sainath Nimmagadda <intrinsi@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sat, 15 Nov 2003 09:54:54 -0800 (PST)
I understand the responses(using different tracks) to Doug's question- but
don't know why his track is wrong altogether. Someone, please explain why and
where his approach doesn't work.
Thanks,
Sainath
[ from Archives]
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From: Doug Brooks [mailto:doug@xxxxxxxxxx]
Sent: Wednesday, November 12, 2003 4:43 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Transmission line match
I am trying to develop a *qualitative* (NOT quantitative) explanation of
what happens at the terminating end of a transmission line. I think I am on
the track with this model and discussion:
1. The transmission line model is a lumped model of a string of Ls and Cs.
2. The termination value forms a time constant with these. That is, if
R=Z=(L/C)^.5, then RC=L/R. That is, when correctly terminated, the time
constants are matched.
3. If the terminating resistance is high, then the RC time constant is
relatively longer. If it is low, then the L/R time constant is relatively
longer.
At this point I am having trouble getting over the "so what?" and
completing the argument. What is the next step in this argument..... or am
I on the wrong track altogether?
Thanks
Doug Brooks
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