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Characterization of Via Structures in Multilayer Printed Circuit Boards With an Equivalent Transmission-Line Model

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2 Author(s)
Siming Pan ; Cisco Syst., Inc., San Jose, CA, USA ; Jun Fan

Vias are typical discontinuities for high-speed signal transmission in printed circuit boards (PCBs). This paper proposes an equivalent multiconductor transmission-line model for via structures in multilayer PCBs. The proposed model is based on the physic-based circuit model, taking into account distributed effects. Various via structures with arbitrary via number, trace connections, and via stubs can be effectively handled in the equivalent transmission-line model, which is sufficiently accurate and fast to be integrated into circuit simulators for via and link-path analysis. With the proposed model, well-known transmission-line theories can be borrowed for via modeling and characterization for signal integrity in high-speed digital circuits. The proposed model is validated with both full-wave simulations and measurements for multilayer PCBs with different via structures.

Published in:

Electromagnetic Compatibility, IEEE Transactions on  (Volume:54 ,  Issue: 5 )

Date of Publication:

Oct. 2012

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