[time-nuts] Comparison of Logic Standards for Clock Distribution
James Maynard
james.h.maynard at usa.net
Tue Oct 24 12:35:25 EDT 2006
Stephan Sandenbergh wrote:
>
<snip>
> .... However, faster edges give rise to various problems
> such as crosstalk, EMI and reflections&ringing. I guess that another
> approach would be to differentially transmit the clock in sinusoidal format
> where after it is heavily filtered and squared at the receiving end. Now,
> one would have less transmission line problems but also less noise immunity.
>
The way to minimize reflections and ringing, methinks, is to terminate
your cable with its characteristic impendance. A 50-ohm coax is called
that because a long length of that coax acts like a 50-ohm resistor. So
if you terminate the coax with a 50-ohm resistor, the cable "thinks" it
is terminated with an infinite length of the same coax. Hence, no
reflections, no standing waves.
--
James Maynard, K7KK
Salem, Oregon, USA
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