From: Bob Perlman ([email protected])
Date: Mon Sep 04 2000 - 13:18:23 PDT
Hi -
A happy Labor Day to all.
I'm looking into effects that can distort very high frequency
waveforms. There's already been a lengthy discussion of skin
effect here, and in the past folks have discussed dielectric
absorption.
One thing I haven't heard much about is dispersion. My
understanding is that, for long signal traces or cables, slight
frequency-dependent differences in propagation delay can cause
the various frequency components in a signal transition to de-align,
causing the edge to disperse. Some of the causes to which this is
attributed seem to be:
- different frequencies propagating in different transmission modes
- changes in dielectric constant as a function of frequency.
Of course, I could be totally wrong; this is just what I've been able
to piece together from things I've read. Can anyone explain
dispersion, or point to a good text that does? Under what
conditions does dispersion become significant?
Thanks,
Bob Perlman
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