On Aug 15, 2008, at 5:19 PM, DJ Delorie wrote: > >> You're right. I'm always amused by the "noise on ground" notion. It's >> the sound of one hand clapping. Noise relative to what? > > The power plane? That board has two planes (power and ground).
Yes. But that would require no resistor between PVSS and ground to fix. > Why > is one always the reference? Because that simplifies network theory. But the problem here is that the network theory approximation doesn't work: you have to consider your interconnections as transmission lines. It's 200 picoseconds past the rising clock edge: do you know where your return current is? John Doty Noqsi Aerospace, Ltd. http://www.noqsi.com/ [EMAIL PROTECTED] _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user