Capacitor selection process for high-speed power distribution network based on switching current requirement

摘要

To achieve power integrity (SI) in high-speed electrical systems, power distribution network (PDN) should be well designed to satisfy the current demand of integrated circuits (IC), provided the power supply voltage drop does not exceed the IC specifications. In this paper, we propose a new PDN design methodology in time domain. With a newly-defined contribution factor (CF) based on known switching current requirements, a sound criterion is derived for effective capacitor selection process. With two PDN designs as case studies, the proposed capacitor selection process is validated.