Prediction of Crosstalk Involving Twisted Pairs of Wires a Simplified, Low Frequency Prediction Model

Abstract

A simplified model for predicting crosstalk invol­ ving twisted wire pairs which is valid for low fre­ quencies is developed. The total coupling is separated into inductive and capacitive coupling contributions. The capacitive coupling contribution is shown to pro­ vide a "floor" which limits the effect of reducing the inductive coupling achieved by twisting a wire pair. These contributions are computed from Fig. 2 where and Cjj are the mutual inductance and capacitance, re­ spectively, between the two circuits, and Igpg and Vqjjq are the generator circuit current and voltage, respec­ tively, which are Computed for zero frequency of excita­ tion [2 ].