Cross Talk Analysis on Multiple Coupled Transmission Lines; (The calculation of transfer functions on multiple coupled tansmission lines in an inhomogeneous dielectric medium)

Abstract

A flow graph relating voltages and the forward and reflected propagation modes (? TEM) on multiple coupled transmission lines in an inhomogeneous dielectric medium is presented. This flow graph directy gives the different transfer functions, including S-parameters, in matrix form needed to calculate crosstalk on the lines. An 8 bit databus is analysed in the frequency-and time domain. This analysis shows, as expected, that crosstalk can be a problem in connection with high speed logic circuits. The same databus is also analysed using the quasi-propagation-mode method proposed by Dalby [1-6]. This comparison shows, that the analysis and synthesis methods presented in [1-6] for interdigital filters to all practical purposes are accurate for frequencies below about 0.7 times the half-wave-length freuency for the lines.