Homebrew PCBs

When I say digital, I refer to a CMOS counter (RC clock) to control a 
multiplexer/demultiplexer IC to switch an analog signal. So only two 
digital ICs.
"When doing ground layout i like to think in voltage drops"
You refer to traces voltage drops?

Adrian



--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@...> wrote:
> 
> Usually you have some sort of interface between digital and alalog, 
like a  
> AD converter. Then you will connect the grounds right at that 
component.  
> If you don't then right at the supply is fine. Power is not such a 
problem  
> as long as you decouple things well. You may need inductors as 
additional  
> filters for sensitive circuits, with caps both sides. The inductor 
blocks  
> ac as you know.
> When doing ground layout i like to think in voltage drops.
> ST