Paul, Emanuel,

I like both of those ideas! I have a few questions.

1. With regards to the design rule. If I allow the nets of the three GND
planes to be able to short together, would the neck be the last thing I
place so the polygons don't completely short when repouring. (Assuming the
corners of the polygons are placed together) Now that I think about it I
could just draw them so they don't touch when repouring.

2. With the Lomax Virtual Short. (I like this idea better because it allows
me to place a "component" on the schematic.) Will the board house have a
problem with this? Will they just separate the pads by the standard minimum
spacing? Perhaps I should make a note on a drawing somewhere indicating that
I actually want the planes shorted.

Well, I think I answered my own questions but I open for thoughts/comments.

Tim

-----Original Message-----
From: Emanuel Zimmermann [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, September 11, 2002 9:57 AM
To: Protel EDA Forum
Subject: Re: [PEDA] GND Plane Neck


Tim,

Sorry for missing the original post, but theres a lot of traffic on this
forum
that makes me not reading every letter!

In fact its a job for the Lomax virtual short. Abd introduced this idea of a
two
pin SMD component with its pads nearby touching each other (separated by say
0.01mil) and a design rule allowing this small gap just for this component a
while ago.

I personally prefer the zero ohm resistor because it allows the bare board
be
tested with separated nets guaranteeing a star point topology in your
grounds.
With the Lomax virtual short you'll loose this ability!

Hope this helps,

Emanuel

Tim Fifield wrote:

> So is there nobody who knows how to do this?
>
> Tim
>
> -----Original Message-----
> From: Tim Fifield [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, September 10, 2002 11:17 AM
> To: Protel EDA Form
> Subject: [PEDA] GND Plane Neck
>
>
> I have 3 GND planes (3 different net names on the sch) I need to neck
> together on a PCB and cannot figure out how to do it on the schematic and
> PCB nicely, without errors, and without placing a zero ohm resistor down.
>
> Does anybody know how to do this on the schematic and PCB? I seem to
recall
> a thread about a virtual short; is that what I'm looking for?
> Tim Fifield, CET
> International Rectifier - Automotive
>
>
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