[SI-LIST] High Speed Routing

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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