A Time Domain Approach to Estimate Current Draw from SMT Decoupling Capacitors

Lin Zhang
Ray Alexander
Richard E. DuBroff, Missouri University of Science and Technology
James L. Drewniak, Missouri University of Science and Technology
James L. Knighten
Norman W. Smith
Bruce Archambeault, Missouri University of Science and Technology
Samuel Connor
Jun Fan, Missouri University of Science and Technology

This document has been relocated to http://scholarsmine.mst.edu/ele_comeng_facwork/1408

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Abstract

A time domain approach to investigate and predict impedances and scattering parameters of a DC power bus is proposed. This approach is based on a cavity model and is achieved using a circuit simulation tool - SPICE. A SPICE-based circuit model for triangular power plane segments is described, verified and applied to simulate both the frequency and time domain characteristics of an irregularly shaped two-layer PCB board. Furthermore, the current draw from a surface mount technology (SMT) decoupling capacitor is simulated and estimated using this approach. Near-field electromagnetic loop probes are used to validate the current estimation qualitatively. Additionally, the frequency bandwidth of this SPICE model is investigated using a network analyzer and time domain reflectometry.