[sdiy] Analog & Digital Ground

[Seb Francis]

>> I think that careful PCB layout and routing of traces
>> to maximize capacitance and minimize inductance
>> (parallel power and ground traces) and proper
>> decoupling will do much more than the beads...
>
> In my experience the beads have killed spikes that extra bypassing 
> doesn't.  But maybe my layout wasn't good enough.
>
>   Ian
>
>

According to the PDF document, it's the higher frequencies (>75MHz) that 
will not be filtered effectively by decoupling capacitors alone.  
Digital spikes from uProcessors, etc. wouldn't certainly contain these 
high frequencies.

Seb