[sdiy] Analog & Digital Ground

[ASSI]

On Freitag, 21. April 2006 02:09, Seb Francis wrote:
> Personally I'm going to try it with it in first.  There is local
> decoupling for the PIC power so any short current spikes should be
> able to come from here rather than from the PSU.

Colin has it right, the ground return path to the PSU needs to be as low 
inductance as you can help it (hence the need for ground _planes_ 
instead of ground lines in high-speed circuits). The ferrite beads on 
ground connections may only come in handy in situations where you need 
multiple connections between analog and digital ground for local 
referencing (like if you have multiple ADC/DAC) or when there is 
otherwise no way to keep a strict star topology on your ground 
distribution. Such connection must not carry any supply current anyway.


Achim.
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