In this study, the effects of using non-functional pads to optimize the performance of high-speed signal vias are investigated based on multiple reflection analysis. The non-functional pads on signal vias introduce more capacitive coupling and are possible to improve the response of the via structure if the original via has relatively larger impedance compared to the system reference impedance. The effectiveness of the non-functional pad optimization is validated through a numerical example, and the eye diagram of the via structure without and with non-functional pads are compared. The eye opening becomes 5.4 times larger after the via optimization using non-functional pads.
M. Ouyang et al., "Optimizing the Placement of Non-Functional Pads on Signal Vias using Multiple Reflection Analysis," 2022 IEEE International Symposium on Electromagnetic Compatibility and Signal/Power Integrity, EMCSI 2022, pp. 169 - 174, Institute of Electrical and Electronics Engineers, Jan 2022.
The definitive version is available at https://doi.org/10.1109/EMCSI39492.2022.9889339
Electrical and Computer Engineering
Keywords and Phrases
multiple reflections; non-functional pad; signal integrity; via optimization
International Standard Book Number (ISBN)
Article - Conference proceedings
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01 Jan 2022