Investigation of EMI on multilayer printed circuit boards: /spl Delta/I-noise and power supply decoupling

The aim of the analysis reported in this paper is to investigate /spl Delta/I-noise in multilayer Printed Circuit Boards (PCB's) with respect to the decoupling and the interplane capacitance of the on-board power distribution network. In investigating these phenomena a test set-up was used which emphasizes the problem of 'power-noise', and a simple model for the power bus has been developed. Experimental and analytical studies, and circuit simulation have been conducted to verify the model and the effects of decoupling capacitors. In this analysis the problem of ElectroMagnetic (EM) radiated emissions from such boards is also addressed.