[SI-LIST] Re: High Speed Routing
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: ponganesh@xxxxxxxxxxxxxxxxxx
- Date: Wed, 30 May 2007 13:15:59 -0400
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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