[SI-LIST] Re: EMI and Power plane card edge clearance distance

stitching in this case refers to the practice 
of dropping vias connected to ground at the edge
of the board.

best regards,

Michael Greim

-----Original Message-----
From: Michael Schmitt [mailto:mschmitt@xxxxxxxxxxxxxxx]
Sent: Tuesday, August 14, 2001 9:27 AM
To: dmckean@xxxxxxxxxxxxxxx; 'SI-List Discussion Group'
Subject: [SI-LIST] Re: EMI and Power plane card edge clearance distance



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
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