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Damping of cavity-mode resonances in PCB power-bus structures using discrete capacitors

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2 Author(s)
Hampe, M. ; Dept. of Electr. Eng., Helmut Schmidt Univ., Hamburg, Germany ; Dickmann, S.

In this paper, the impact of lumped elements connected to the power-bus of high-speed printed circuit boards is investigated and a computationally efficient expression of the resulting input impedance is derived. This result builds the theoretical basis of a novel technique suppressing cavity-mode resonances within the power-bus using discrete capacitors. Guidelines for an optimized selection and placement of these capacitors are specified. The theoretical results are well confirmed by measurements.

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Electromagnetic Compatibility, IEEE Transactions on  (Volume:47 ,  Issue: 4 )