From: ªL´Â·× (John@quantatw.com)
Date: Thu Mar 30 2000 - 16:59:38 PST
Dear All SI experts,
One question regarding to return path for signals.
If we have stripline configuration, a signal trace between power plane and
When the signal is transient from high to low or low to high, the return
path will be the power or ground plane to a driver's power pins or ground
However, if we change the power plane to ground plane, then the return path
will be the ground planes, above and below the signal trace. It ,then,
passes through the ground planes to the power pins via bypass
cap. or a chip internal path (ground to power).
My question is which configuration is the best for the return path --
1. One power and one ground plane, or
2. Two ground planes with plenty of bypass cap. or
3. Two ground planes with a few bypass, heavily depend on the internal
path. ( I am afraid of noise coupling internally).
Quanta Computer Inc.,Taiwan, R.O.C.
Tel: 886+3+3979000 ext. 5183
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