[SI-LIST] plane-to-plane decoupling
- From: "Michael Rose" <mrose@xxxxxxxxxxxx>
- To: "SI-List" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 15 Sep 2008 12:57:10 -0400
I looking for some suggestions regarding decoupling between co-planar
plane splits. I'm working on a backplane with a number of 3.125Gbps diff
pairs. I've specified a dual stripline stackup assigned as follows:
1 - P
2 - G
3 - S
4 - S
5 - P
6 - G
and so on
Some diff pairs on L4 will cross power plane splits (actual different
power sources and loads) and I wanted to provide an effective AC path
for any common-mode return currents. I was thinking about placing some
nearby decoupling caps from plane-to-plane across the split. Do you
think it would be better to decouple from plane-to-ground on both sides
to steer the current through the L6 ground layer? L5 and L6 are already
coupled through the inter-plane capacitance (they're about 4mils apart).
Which will provide a lower inductance path?
Mike
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