On Wed, 30 May 2001, William Tan wrote:

> Hi, all.
>
> I like to know how to seperate the Analog and Digital Power and Ground?
>

  In a few words: analogic section of your project must be supplied from
different GND and VCC lines like digital section. Usual the autorouter
can't produce correct layers connection, so these must be routed manually
or using all restriction that autorouter have.
The analogic ground and digital ground must be tied together (only
once! ) in the lowest impedance point ( usual near supply ) else nothing
will work ( you can't keep these grounds separated only if you are using
floated design, much expensive because need isolated ad converters )
The analogic and digital power ( VCC or +V ) could be from different
supply ( not necessary all the time).
However the analogic supply must be clean and stable.
 Pics have different power supply for analogic and digital function, so
you can easy separate this layers.

Vasile

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