FreeLists / si-list / [SI-LIST] calculating difference impedance for broadside coupled signals

[Sachin Chheda <chheda@xxxxxxxxxxxxxxxxx>]

Hello

Can anyone point me to the formula for calculating the difference impedance for 
a _broadside_ coupled pair of signals in a dual strip line configuration ?


 Ref Plane (GND)
 ---- Thickness A
 Signal S1 (width W, thickness T)
 ---- Thickness B
 Signal S2 (width W, thickness T)
 ---- Thickness A
 Ref Plane (GND)


Thanks

Sachin
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