[SI-LIST] Re: EMI and Power plane card edge clearance distance
- From: Michael Schmitt <mschmitt@xxxxxxxxxxxxxxx>
- To: dmckean@xxxxxxxxxxxxxxx,'SI-List Discussion Group' <si-list@xxxxxxxxxxxxx>
- Date: Tue, 14 Aug 2001 15:27:11 +0200
Can somebody explain me what "stitch around the edge of the board"
means, i guess my english is not good enough to understand that.
Regards.
Doug McKean schrieb:
>
> Hi Mary,
>
> > Are you saying that the 20-H rule only works when the board
> > is bolted to a chassis?
>
> Well, yes. If the board is to be say an interface board plugged
> into a motherboard where it's standing in free space, then you
> must stitch around the edge of the board to attain the same
> sort of effect.
>
> The whole trick, IMO, of the 20H rule is termination of the
> 2D interplanar transmission line. Simply cutting back the
> power planes would tend to have a dispersal effect, not
> sure about that.
>
--
Dipl.-Ing. (FH) Michael Schmitt
Baumer Ident GmbH
Entwicklung / Development Department
Hertzstr. 10
D-69469 Weinheim
Deutschland / Germany
Tel. +49 (0) 6201 9957 - 30
Fax. +49 (0) 6201 9957 - 99
E-Mail : mschmitt@xxxxxxxxxxxxxxx
Web: http://www.baumerident.com
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