Frequency Domain Analysis of EM Crosstalk Problem in a Quad by the Equivalent Cable Bundle Method Among Twisted-Wire Pairs Cable Bundle

Abstract

In this paper, the equivalent cable bundle method (ECBM) is used with some modifications to predict crosstalk within a bundle of twisted-wire pairs (TWPs) terminating with differential loads at their far end and colocalized as quads in the frequency domain. When using this method, one can easily calculate crosstalk in many pairs with good reduction of complexity and computation time. In this paper, power loss of crosstalk is calculated for both complete and reduced models using the multiconductor transmission lines method. It is shown that the results are in agreement by applying this modified ECBM, and the number of wires as well as the computation time is successfully reduced. The in-quad is the four conductors located in the same quad and the outside-quad is all other conductors in the bundle. The in-quad and outside-quad architecture results are also discussed, and it is observed that the in-quad crosstalk has an enormous amount of crosstalk compared with the outside-quad crosstalk. A new three-step ECBM for predicting the crosstalk within a TWP network is proposed, the pairs are colocalized as quads, and the use of this method allows an easy modeling of crosstalk within a TWP cable bundle.