Analysis and Design for Suppressing Edge Radiation of Power/Ground Planes by Decoupling Capacitors
Date Issued
2011
Date
2011
Author(s)
Li, Kuan-Wei
Abstract
This thesis focuses on the problem of Electromagnetic Interference（EMI）of Printed Circuit Board（PCB）power/ground planes, which is a crucial issue to the whole system stability in the high speed digital circuits. The ground bounce is the primary noise of power/ground planes which arises from the current flowing through a via or the signal trace crossing the slot lines. Bouncing back and forth from the edges of substrate, it will generate a standing wave, and give rise to the radiated emission, usually identified as EMI to the other circuits in the system. The thesis proposed the use of decoupling capacitors around the power/ground planes to suppress the edge radiation noise. A canonical problem simplified from the original structure is constructed, and based on which, the influence of decoupling capacitors on the electric field at the edge is analyzed. Analytical formulae are derived to design the decoupling capacitors with the lowest cost to achieve the best noise suppression. In addition, the analysis predicts the extremely low radiation at a certain frequency, which can be utilized to suppress the most critical noisy spectrum of the system by choosing the suitable capacitance value of decoupling capacitors. Finally, giving the illustrative examples, the design curves and flow charts are presented to facilitate the designers with the practical reference. Full-wave EM simulation and GTEM Cell measurement are used to validate the accuracy of the proposed analysis and design.
Subjects
decoupling capacitor
edge radiation
electromagnetic interference（EMI）
ground bounce noise
power/ground plane
Type
thesis
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