[SI-LIST] Re: High Speed Routing

Especially considering the vast amount of info available as compared to when I 
studied transmission lines. The only classes available to me were microwave, 
sine wave based transmission line classes that taught the use of variable 
length "air lines" for termination.
   
  When I started my first job the only reference was the MECL Handbook by Blood 
and much of the info in that book was dubious at best.
Scott McMorrow <scott@xxxxxxxxxxxxx> wrote:
  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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