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Full-Text Articles in Engineering
The Development Of A Closed-Form Expression For The Input Impedance Of Power-Return Plane Structures, Minjia Xu, Todd H. Hubing
The Development Of A Closed-Form Expression For The Input Impedance Of Power-Return Plane Structures, Minjia Xu, Todd H. Hubing
Electrical and Computer Engineering Faculty Research & Creative Works
In multilayer printed circuit boards, the noise on the power bus is influenced by the impedance between the power and ground planes. Power-bus noise estimates require an accurate estimate of the power-bus input impedance. This paper develops a closed-form estimate of the input impedance for circular power-return plane structures. When the structure is lossy (e.g., boards employing embedded capacitance or densely populated boards), the energy reflected from the board edge does not significantly affect the input impedance. In general, the expressions developed here for circular structures can be used to estimate the impedance of lossy power-return plane structures of any …
Printed Circuit Board Emi Source Mechanisms, Todd H. Hubing
Printed Circuit Board Emi Source Mechanisms, Todd H. Hubing
Electrical and Computer Engineering Faculty Research & Creative Works
This tutorial paper reviews the basic mechanisms by which signal voltages and currents on a printed circuit board produce unintentional radiated emissions.
Application Of The Cavity Model To Lossy Power-Return Plane Structures In Printed Circuit Boards, Minjia Xu, Hao Wang, Todd H. Hubing
Application Of The Cavity Model To Lossy Power-Return Plane Structures In Printed Circuit Boards, Minjia Xu, Hao Wang, Todd H. Hubing
Electrical and Computer Engineering Faculty Research & Creative Works
Power-return plane pairs in printed circuit boards are often modeled as resonant cavities. Cavity models can be used to calculate transfer impedance parameters used to predict levels of power bus noise. Techniques for applying the cavity model to lossy printed circuit board geometries rely on a low-loss assumption in their derivations. Boards that have been designed to damp power bus resonances (e.g., boards with embedded capacitance) generally violate this low-loss assumption. This paper investigates the validity of the cavity model when applied to printed circuit board structures where the board resonances are significantly damped. Cavity modeling results for sample lossy …