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

  • From: "Greim, Michael" <mgreim@xxxxxxxxxxxx>
  • To: "'mschmitt@xxxxxxxxxxxxxxx'" <mschmitt@xxxxxxxxxxxxxxx>,dmckean@xxxxxxxxxxxxxxx,"'SI-List Discussion Group'" <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 14 Aug 2001 10:03:47 -0400

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
Web: http://www.baumerident.com
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
  
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
  

Other related posts: