On Simultaneous Escape Routing of Length Matching Differential Signalings

Abstract

In substrate or PCB design, the escape routing problem is considered an essential part and has been widely studied in literature. There are industrial tools and some studies that work on simultaneous escape routing and escape routing of differential pairs on dense circuit boards. However, to route differential pairs simultaneously considering length-matching is still an important and on-going research problem. In this work, inspired by prior state-of-the-arts, we have implemented an integrated approach that achieves simultaneous escape routing considering length matching of differential pairs, our method avoids time-consuming ILP solutions in finding length-matching differential signal paths. Experimental results show that our approach can efficiently and effectively obtain length-matching of differential pairs on simultaneous escape routing to reduce differential-pair skews, compared with B-escape router we reimplemented.