[SI-LIST] Re: XAUI

Lee, I agree that loosely coupled usually brings fewer issues to deal with 
than tightly coupled, making it a safer default recommendation.  For 
loosely coupled, I would avoid broadside coupling including tandems, 
particularly across PP.  If B/S coupled across PP, the registration, and 
therefore coupling can vary quite a bit, especially for narrow traces.  If 
the PP is thin, it just makes it worse.

Steve.
At 02:17 PM 12/22/2005 -0800, Lee Ritchey wrote:
>Actually, neither.  Coupling doesn't have any benefit.  If you can spread
>the traces out so there is no coupling, you've got the best geometry.  Real
>world, you can't do this and route a PCB, so route side by side with as
>much separation as your topology will allow.  Then adjust trace widths to
>give you 100 ohm diff impedance.
>
>Lee W. Ritchey
>Speeding Edge
>P. O. Box 2194
>Glen Ellen, CA 95442
>Phone- 707-568-3983
>FAX-    707-568-3504
>
>I just used the energy it took to be angry to write some blues.
>Count Basie
>
>
> > [Original Message]
> > From: Ravindra Johari <Ravindra.Johari@xxxxxxxxxxxxxxxxxx>
> > To: <si-list@xxxxxxxxxxxxx>
> > Date: 12/22/2005 11:19:44 AM
> > Subject: [SI-LIST] XAUI
> >
> >
> > Hello Gurus!!
> >
> >
> >
> > Which is a better coupling for running a differential pair at XAUI Speeds
> > i.e at 3 Gbps..
> >
> >
> >
> > Is it Edge coupled stripline or Broadside coupled stripline..
> >
> > What kind of constraints can I face with these?
> >
> >
> >
> > Thanks!
> >
> > Ravi
> >
> >
> >
> >
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> > or to administer your membership from a web page, go to:
> > http://www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> > List FAQ wiki page is located at:
> >                 http://si-list.org/wiki/wiki.pl?Si-List_FAQ
> >
> > List technical documents are available at:
> >                 http://www.si-list.org
> >
> > 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
>
>or to administer your membership from a web page, go to:
>http://www.freelists.org/webpage/si-list
>
>For help:
>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>List FAQ wiki page is located at:
>                 http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
>List technical documents are available at:
>                 http://www.si-list.org
>
>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

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

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: