An Analytic Method of Determining a Critical Cable Spacing for Acceptable Crosstalk

Some wiring rules have been used to prevent crosstalk in industrial application, but the technical rationale is not clear. This paper aims at proposing an analytic method of determining a critical cable spacing for acceptable crosstalk. First of all, we derive a calculation function of crosstalk with cable spacing. Then, we discuss about the crosstalk characteristics according to the crosstalk function and its curve. On this basis, we define the critical cable spacing via a critical point on the curve and explain physical meaning of the critical point by use of the fringe field around the victim cable. After that, we analyze the influence of wiring parameters on the critical cable spacing. Finally, we conduct an experiment to validate the proposed method of the critical cable spacing.