On 07/22/2010 09:57 AM, Steven Michalske wrote:
Just make sure that if you've got high-speed digital lines that cross into the
'cubicles' they have gnd plane underneath them where they enter - don't let
fast signals cross the cuts because then the return currents have to take a
different path and that will screw up the signal integrity.
The question is "how fast?". Because you loops may not even matter. But just
remember to keep them small. :-)
Good point - that's left as an exercise for the engineer. In my case
these were 16-bit DAC data buses running at 250MHz, so a few extra
inches in the return path could cause some noticeable distortion in the
higher harmonics and splatter the edges.
OTOH, this board has a 5-bit async attenuator control bus that pops
about once an hour and we didn't give those any priority.
Eric
_______________________________________________
geda-user mailing list
[email protected]
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
