Electromagnetic Coupling Modeling of Microstrip Lines Used in Switching Power Supplies

Abstract

International audienceOne of the major problems in electromagnetic compatibility is the interference due to crosstalk on the PCB (printed circuit board) in the SiP (system-in-package) technology. In this work, electromagnetic coupling modeling of coupled microstrip lines used in switching power supplies is presented. The different blocks which are connected through buses realized on PCBs will be considered as a coupled transmission line. The coupled microstrip transmission lines are modeled by a mathematical model based on the MoM (method of moments). This model is done by Matlab routines. A SPICE (simulation program with integrated circuit emphasis) model is proposed for the prediction of the NEXT (near-crosstalk) and the FEXT (far-crosstalk) at the terminals of the command line. This command line is often victim of electromagnetic interference emitted by a transmission line source close. Some solutions against crosstalk depending on the physical parameters of the coupled transmission lines are proposed