A new decoupling circuit for suppressing radiated emissions due to power plane resonance

摘要

This paper presents a new decoupling circuit for suppressing radiated emissions due to power plane resonance in multilayer printed circuit boards(PCBs). This circuit is based on transmission line theory, and consists of two decoupling ca- pacitors and one power trace. The two capacitors, one mounted on the power pin of an IC and the other mounted on the com- mon power distribution bus in a board, are connected through the power trace. The characteristic impedance of the trace is much higher than the impedance of the capacitors.