[SI-LIST] : Cross-talk Concerns

Alex Theodorou (Alex.Theodorou@abq.sc.philips.com)
Thu, 16 Jul 1998 16:34:35 -0600

I'm thinking about designing a 6 layer circuit board
with the following stack-up:

air
------layer 1: digital signal traces(50 ohm microstrip)/power
distribution
FR-4
------layer 2: digital ground plane
FR-4
------layer 3: digital signal traces(50 ohm stripline)/power
distribution

FR-4

------layer 4: analog signal traces/power distribution
FR-4
------layer 5: analog ground plane
FR-4
------layer 6: analog signal traces/power distribution
air

If there is a trace on layer 1 which mirrors a trace
on layer 3, do I need to be concerned with crosstalk induced
by a signal on the layer 1 trace onto the layer 3 trace, even
though there's a conducting plane (layer 2) between the two
traces?

Thanks in advance for any explanations.

-Alex Theodorou