Scott Buscomb wrote:
>
> What is the reasoning behind setting copper back from the board
>edge by
> .030-.040 besides tolerancing and the possibility of cutting the
>trace?
> I would like to bring a copper feature right to the edge of the board
> (trimmed during the routing process) for a shield base. Is there any
> hidden problem with cutting copper w/plating during the routing
>process?
>
> Any comments?
> Thanks,
>
> Scott
> --
> Scott Buscomb, Senior Designer
> [log in to unmask]
> Techsonic Industries
> 1111 Alderman Dr. Ste. 250
> Alpharetta, GA 30005
> 770 475-3020 ext.1032

Hi Scott,
on some EMI sensitive PCBs we design, we flood the top and bottom
of the board with copper pour (PADS-Perform) that is connected
to GND as an EMI shield, right past the board edge and then
ask the PCB fab shop to plate the edges of the PCB.
That's the only time we allow copper from any layer, external or
internal (GND plane) to reach the boars edge.
Of course we do not do this for any traces or power plane layer.

 regards

 Eric Bonatti

 << UBI MAJOR, MINOR CESSAT >>

Q.: Would a fly without wings be called a 'walk'?
----------------------------------------------------------------
 Eric Bonatti - Printed Circuit Board Design
 GN Nettest (CANADA) Datacom Division
 phone: 905-479-8090 xt.497 / fax: 905-475-6524
 email: [log in to unmask]
 web:   http://www.nettestca.gn.com
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