gEDA-user: Alarm clocks and switching regulators

[DJ Delorie]

> > > 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?

It also creates larger ground return loops, which increases EMI.