Fast EMI Analysis for Multilayer PCB Routing
Date Issued
2015
Date
2015
Author(s)
Lin, Chang-Yu
Abstract
This thesis focuses on the problems of Electromagnetic Interference（EMI）of multilayer Printed Circuit Board ( PCB ), and it can be separated into two parts. First part is edge radiation which is mostly contributed to the ground bounce noise of PCB arising from current flowing through vias or the signal trace crossing slot lines. The electromagnetic waves reflecting back and forth from edges of the substrate generate a standing wave, which creates effective magnetic currents causing serious EMI issues. Here, the cavity resonator model is used to predict the edge radiation. This thesis also proposed using stitching vias around the PCB to suppress the edge radiation, thereby leading to the optimal design of shorting vias is given. Second part is surface radiation. Based on electromagnetic theory, a closed-form formula for far field radiation by a straight microstrip transmission line section is derived. The far field information can be obtained by combining SIwave, which gives the node voltage and location information of routing. The total radiation prediction of general PCB routing can also be obtained by applying the concept of array factor in antenna theory. The simulation time of this method is faster than HFSS and SIwave and furthermore, this method can be applied in common differential and common-mode signals. Finally, this thesis integrates the surface and edge radiation. Full-wave simulation and GTEM Cell measurement are used to validate the accuracy of the proposed analysis and shorting via design.
Subjects
cavity resonator model
electromagnetic interference（EMI)
ground bounce
shorting vias
Type
thesis
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ntu-104-R02942085-1.pdf
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