Re: gEDA-user: Alarm clocks and switching regulators

[Peter Clifton <pcjc2@xxxxxxxxx>]

On Mon, 2007-09-24 at 19:08 -0500, John Griessen wrote:

> not supposed to let any traces cross the
> > moat.)
> > 
> That last sounds like a spell...skip it.

Isn't that one because the impedance of a track changes abruptly as it
passes a cutout in the ground plane - causing signal degradation due to
reflections, and perhaps return currents not being able to flow
underneath the signal track in the plane?

Anyway - seems this would only matter for fast edged signals.

> It has to have  a reason -- like keep the application circuit traces
> out of the moat...
> Not all...
> 
> John G
-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)



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