[SI-LIST] : More on differential impedance calculations

Mark Nass (markn@rccorp.com)
Thu, 05 Feb 1998 15:10:50 -0800

From the advice I heard so far I used a microstrip topology with
2 - 5 mill wide traces, 5 mills apart and 10 mills over a plane.
Using XFX I get 3 impedances:

85.77 is the trace to plane impedance
109.75 is the even mode impedance
60.13 is the odd mode impedance

This appears to be what I want. Any comments?

Also it seems to me that I want to have some amount of coupling between
the two traces so that any noise that gets injected into these traces will
have a canceling effect.

Mark