Via optimization for next generation speeds

Abstract

Optimizing via placement is becoming important as signaling speeds increase for next generation interconnects. Random placement of ground (GND) return path vias next to signal vias would result in less than optimal performance of an interconnect. It will result in resonances in insertion loss at higher frequencies. In this paper, a methodology for optimal placement of GND vias is proposed that will not only decrease the resonances in insertion loss but also minimize the crosstalk between adjacent differential vias.