[SI-LIST] : Question on propagation delay........

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From: Greim, Michael (mgreim@mc.com)
Date: Mon Apr 17 2000 - 10:14:56 PDT


Hi everyone,

Here is what I thought was a simple question but
has turned into a discussion of some debate. Three
nets are routed on a pwb as stripline structure. They
are driven by the same type of driver and have the same
type of receiver. There is one driver and one receiver per
net. They contain the same number of vias in the same
location on the nets with the same padstack. The only
topological difference of the nets is that they are routed
as different widths. That being said, what is the flight
time of these topologies as a function of length. Is it
strictly a function of the dielectric? What is the relative
effect of varying number (say difference of no more than
a handful) of vias on the nets.

Whaddya think?
>

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