DC power-bus modeling in high-speed digital design using the finite-difference time-domain (FDTD) method is demonstrated herein. The dispersive character of the dielectric layers used in printed circuit board substrates is taken into account in this study. In particular, FR-4 is considered. The complex permittivity of the dielectric is approximated by a Debye model. A wide-band frequency response (100 MHz-5 GHz) is obtained through a single FDTD simulation. Good agreement is achieved between the modeled and measured results for a typical dc power-bus structure with multiple surface mount technology (SMT) decoupling capacitors placed on the printed circuit board (PCB). The FDTD method is then applied to investigate some general approaches of power-bus noise decoupling


Electrical and Computer Engineering

Keywords and Phrases

100 MHz to 5 GHz; Debye Model; FDTD Modeling; FR-4; PCB; SMT; Circuit Noise; Complex Permittivity; Dc Power-Bus Design; Dielectric Layers; Digital Circuits; Dispersive Media; Electromagnetic Compatibility; Finite Difference Time-Domain Analysis; Finite-Difference Time-Domain Method; High-Speed Digital Design; Power Supply Circuits; Power-Bus Noise Decoupling; Printed Circuit Board; Printed Circuit Board Substrates; Printed Circuit Layout; Surface Mount Technology; Surface Mount Technology Components; Wide-Band Frequency Response

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Document Type

Article - Journal

Document Version

Final Version

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© 2001 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

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