Signal integrity

摘要

Welcome to the Signal Integrity Column! In this issue, you will find a practical paper of great interest. As you may know, electromagnetic band gap (EBG) structures have been extensively studied in the past several years due to their great potential in mitigating power-bus noise that propagates through the parallel planes in high-speed multilayer printed circuit boards. However, for practical applications of the EBG technology in engineering designs, potential issues such as size of the EBG structures, implementation of the EBG in internal layers, effects of vias, signal and noise-coupling consequences when traces are routed through the EBG region, etc., are often the concerns of many printed circuit board (PCB) engineers. This paper addresses some of the practical issues by proposing a narrow fence-type EBG region around noise sources. I am sure that readers will find some of the ideas and design methodologies proposed in this paper quite useful.