PCB : multiple polygons/planes on ground solder

[Simon_T]

Hello,

I have read the posts on ground planes in this forum.

However i need multiple planes on the same layer.
1 ground plane, 1 positive supply plane and 1 negative supply plane.

How can this be done ?

best regards

Simon

[John Griessen-3]

Simon_T wrote:
  i need multiple planes on the same layer.
> 1 ground plane, 1 positive supply plane and 1 negative supply plane.
>
> How can this be done ?

Give them separate names.  The netlister and PCB will keep them separate
as you run DRC checks.

John G


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[DJ Delorie]

> However i need multiple planes on the same layer.
> 1 ground plane, 1 positive supply plane and 1 negative supply plane.
>
> How can this be done ?

If the question is "how can I do this in pcb", the answer is polygons.
What I do is run traces to all the power/ground pins as if they were
regular signals, then go back at the end and fill in all the empty
space with polygons, which overlap their traces.  The result looks like this:

http://www.delorie.com/pcb/m3a/
(download board.pcb and look at the solder side)

I found it easier if I assigned many layers to things, such as "solder
side vcc traces" and "component side gnd polygons".  Then, I could
un-group them, shut off some of them, and do my routing.  Then group
them back together for DRC.

You can also see an example of this at the SMD challenge page:
http://www.delorie.com/pcb/smd-challenge/


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[Ostheller, Joel A.]

> -----Original Message-----
> From: geda-user-bounces@... [mailto:geda-user-
> bounces@...] On Behalf Of Simon_T
> Sent: Tuesday, February 20, 2007 12:56 AM
> To: geda-user@...
> Subject: gEDA-user: PCB : multiple polygons/planes on ground solder
>
>
> Hello,
>
> I have read the posts on ground planes in this forum.
>
> However i need multiple planes on the same layer.
> 1 ground plane, 1 positive supply plane and 1 negative supply plane.
>
> How can this be done ?
>
> best regards
>
> Simon
>

I use the polygon tool to create the different planes on that layer. I
think on my last board I gave about 50 mils of separation between the
planes. I then hooked up one via to each plane using the therm tool,
thus making that entire plane equal to that net.


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