On Thu, 2010-07-22 at 02:13 -0400, gene glick wrote: > I'm throwing this out to the list for opinions. . . > > This design has mixed analog and digital circuits.
I do not know much about that, but I have seen a few discussions about that topic in Internet. My conclusion: General discussion makes not too much sense. You have to show your schematic and intended layout to smart experts, than they can tell you how to improve it. Often stupid partitioning of GND in digital and analog can generate much trouble, so one single low impedance ground plane can be a simple and not too bad solution. For my DAD/DSO board I used a 4 layer board with one ground plane, divided into analog and digital part, joined near the ADCs. I think that should be OK, but radiated noise (by air) may be a problem, ie. from FPGA and switching voltage regulators to analog amplifiers. So I have to shield the sensitive analog amplifiers by a tin cup. I think I will build the board in a few months, so I will learn more about noise coupling. Best regards Stefan Salewski _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
