Re: gEDA-user: pcb, howto partition power planes?

[Stefan Salewski <mail@xxxxxxxxxxxx>]

Am Montag, den 27.10.2008, 19:47 +0200 schrieb Duncan Drennan:
> 
> > Yes, I also have GND and AGND in my schematics.
> 
> Don't put inductors between ground planes, connect them at a star
> point. If you are going to use inductors then have them on the power
> side, not between grounds.
> 

I think so too -- but it may depend on what we build. Indeed I have seen
recommendations to employ inductors in newsgroup sci.electronics.design.
I use an analog ground where my OpAmps reside, and a digital ground for
FPGA, uC. Situation is more complicated for DC/DC-converters or ADC,
there are detailed shapes for ground and  power planes in some
datasheets. But my question currently is not how it should look, but how
I build it best with pcb.

> > How do I best divide a copper area (physically) into subsections with
> > complicated shape/outline.
> 
> Is there a good way to do this with PCB?

This is my question.

> It would be relatively easy
> if planes could be handled as negatives, i.e. everything you see is
> NOT there. Then it is just a matter of moving a line.
> 
I would be also interested in how this is handled in other pcb programs.

Best regards,

Stefan Salewski




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