Does anyone out there have the preferred configuration and equations for
controlling the impedance between a differential pair of traces that are
sandwiched between two power planes on epoxy-glass?

Also, does it matter if one of the power planes is ground and the other
"hot", or will the inevitable in-circuit capacitance between them ensure
a common ac reference at typical transmission line frequencies?

Thanks,
-- 
Max.P.Harris
Lockheed Martin Canada, Inc.

'Nil illegitime carborundum'

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