Differential Impedance

Dr. Edward P. Sayre (esayre@nesa.com)
Thu, 10 Apr 1997 21:59:06 -0400

An alternate definition of differential impedance can be derived by thinking
about two differential conductors as coupled distributed transmission lines.

Under this paradigm, the definition of differential impedance can be shown
to be:

Zdiff = 2*Zo*((1-Kb)/(1+Kb))

where: Zo is the single line impedance
Kb is the near end crosstalk coefficient

These parameters are easy to compute or measure and the results are very
accurate.

Sincerely,

ed sayre

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