Reducing Power Bus Impedance at Resonance with Lossy Components

Todd H. Hubing, Missouri University of Science and Technology
Theodore M. Zeeff

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Power bus structures in printed circuit boards with solid power and ground planes exhibit resonances. When the power bus is resonant, the power bus impedance can increase dramatically. This paper explores the effect of component equivalent series resistance (ESR) on power bus resonances. General guidelines for selecting an optimum ESR are provided and are supported by laboratory measurements and numerical simulations.