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

[Neil Webster <nwebster@xxxxxxxxxxx>]

I typically deal with this by separating the planes at the schematic
level using a bead-core inductor. The two planes are then on different
nets at the PCB level. This not only makes it easier to do the routing
but they also serve an electrical purpose of isolating the two planes
from a high frequency viewpoint, whilst connecting them at DC.


On Mon, 2008-10-27 at 16:39 +0100, Stefan Salewski wrote:
> Sometimes it is necessary/recommended to partition (separate) power or
> ground planes, i.e. for ADC or DC/DC-Converters, see page 16 and 17 in
> 
> http://focus.ti.com/lit/ug/slwu028c/slwu028c.pdf
> 
> We can do this in pcb program with (adjoining) polygons.
> Disadvantage is, that if we change the size of one of the polygons we
> have to manually adjust the other sizes. A other method may be so divide
> a large polygon by copper clearing traces (with trace width zero). 
> 
> This is related to my question from
> 
> http://archives.seul.org/geda/user/Sep-2008/msg00387.html
> 
> but not identical.
> 
> What is the best way to handle this?
> 
> Best regards
> 
> Stefan Salewski
> 
> 
> 
> 
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> 
> 



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