[SI-LIST] High Speed Routing
- From: "Pon Ganesh" <ponganesh@xxxxxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 30 May 2007 17:13:59 +0530
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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