Crosstalk Analysis of High-Speed Serial Technology with VNAs

Crosstalk occurs when energy radiated by an aggressor channel is absorbed by a victim channel. The amplitude of the resulting crosstalk noise is inversely proportional to the rise/fall time of the aggressor but can be reduced by channel layout. This whitepaper provides an S-parameter description of crosstalk and then works through the details of crosstalk figures of merit for differential high-speed serial systems from 1 Gb/s all the way to 112 Gb/s (56 Gbaud PAM4).