[SI-LIST] Re: High Speed Routing

  • From: Zeeshan Siddiqi <zeeshan73@xxxxxxxxx>
  • To: Scott McMorrow <scott@xxxxxxxxxxxxx>, ponganesh@xxxxxxxxxxxxxxxxxx
  • Date: Wed, 30 May 2007 16:38:50 -0700 (PDT)

Scott: you owe me a keyboard.. i laughed so hard pepsi
came out my nose.. thanks for the mid week relief.

Pon: We are all here to learn and share our
experiences. If you have a specific questions, than
the gurus will be more than happy to impart their
wisdom, but the questions you presented were so open
ended that most of us here could fill entire volumes
discussing them. Hope you would spend some time
googling the material and come back with some
interesting questions. Best of luck.

-zeeshan


> 
> > [Original Message]
> > From: Scott McMorrow <scott@xxxxxxxxxxxxx>
> > To: <ponganesh@xxxxxxxxxxxxxxxxxx>
> > Cc: <si-list@xxxxxxxxxxxxx>
> > Date: 5/30/2007 10:47:39 AM
> > Subject: [SI-LIST] Re: High Speed Routing
> >
> > Pon,
> >
> > Go out and do your own research before you pose a
> plethora of questions 
> > like this. It looks like you are a University
> student trying to answer 
> > questions on a take-home test.
> >
> > Scott
> >
> > Scott McMorrow
> > Teraspeed Consulting Group LLC
> > 121 North River Drive
> > Narragansett, RI 02882
> > (401) 284-1827 Business
> > (401) 284-1840 Fax
> >
> > http://www.teraspeed.com
> >
> > Teraspeed® is the registered service mark of
> > Teraspeed Consulting Group LLC
> >
> >
> >
> > Pon Ganesh wrote:
> > > Expecting your answers for the below.
> > >   a.. I have two groups of signals Group-A (3GHz
> differntial pair) and
> Group-B (16bit, 250MHz DDR2 single ended lines).
> Both A&B can't be routed
> in inner layers. Either one must be routed on
> Microstrip. Which one u ll
> route in Micro strip (Single ended-250Mhz/diff3Ghz)
> ? 
> > >   b.. Whats the use of dual stripline, when
> no.of layers is not a
> issue., 
> > >   c.. why don't u prefer odd-no of layers ? (
> answers other than... PCB
> warpage, Fab feasilbility and Cost) 
> > >   d.. U have 20MHz and 200MHz signal on a same
> layer. How ll u route .
> Isolation ? 
> > >   e.. How stitching capacitors are useful to
> minimize in-rush current 
> > >   f.. When ll u use spoke vias. whts the
> disadvantage of spoke vias
> > >   g.. Why do we noramlly short isolated Analog
> and Digital digital GNDs
> on a small area
> > > Thanks,
> > > Pon Ganesh
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