Effect of NEXT coupling in close proximity to receiver of 25Gb/s bus

Abstract

This paper demonstrates the deleterious effect of Near End Cross Talk (NEXT) on 25.78 Gb/s communication links from proximity of aggressors to the victim's receiver end. Modeling studies and experimental results clearly indicate that at these higher data rates, even shorter lengths 2mm) of tight coupling could effectively close the eye, particularly when the coupling is near the victim's receiver end. Hence particular care must be taken in layout design of constrained areas like chip package to ensure this form of NEXT coupling happening near the victim receiver end is avoided.