> Do you have any recommendations how to block the current sources > from picking up some garbage from the air and causing oscillation? > Should I block the rail with a single big capacitor against the > ground, or use individual capacitor for each transistor placed > between emitter and base?
In my m3a expansion board, I did both. I put big caps near the board's power feed, medium caps on the ends of the rails, and small caps right at each power pin. In your case, you'd want a medium cap at the end of each rail to provide low frequency bypassing, and a small-package cap right at each base for high frequency bypassing. This is based on my guess that smaller packages plus less traces means higher inductance; you'd have to figure out how the trace/package inductance figures in to your RF circuits. http://www.delorie.com/pcb/m3a/board.pcb _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
