Minimizing differential crosstalk of vias for high-speed data transmission

This paper presents the design of electrical interconnect for high-speed data transmission involving differential signal vias on printed circuit board (PCB). Between two channels of differential vias, with given intra pair via pitch and spacing from adjacent channel vias, there exists an offset angle where differential crosstalk is minimized. By studying single-ended terms of NEXT and FEXT relation in both time and frequency domain, it becomes clear that such phenomenon occurs once in every quadrant. The crosstalk reduction can be achieved without placing ground vias in between signal vias of two channels, giving more routing space in high-speed PCB designs.