An Investigation on Multiple Reflections and Group Delay Behavior in High-Speed System Designs
In this study, the analytical solution for the group delay of a high-speed system with large impedance mismatch is derived. The accuracy and applicability of the solution are validated by comparing the calculated results between the analytical formulation and commercial tool results. Causal frequency-dependent stripline model is used in the formulation, and the derivation of analytical formulation is based on the transmissions and reflections of wave components in the high-speed channel. Therefore, the causality of the system can be ensured, and the number of transmissions and reflections considered in the calculation can be specified in the formulation. The derived analytical results indicate that multiple reflections in a system with impedance mismatch will contribute to oscillations in the group delay curve, but the minimum group delay at the valleys of the oscillations does not appear to be the minimum propagation delay of the system. The benefits of having analytical results play a critical role in identifying channel impairments in high-speed designs.
M. Ouyang et al., "An Investigation on Multiple Reflections and Group Delay Behavior in High-Speed System Designs," Proceedings of the 2021 Joint IEEE International Symposium on EMC/SI/PI, and EMC Europe (2021, Raleigh, NC), pp. 423 - 428, Institute of Electrical and Electronics Engineers (IEEE), Aug 2021.
The definitive version is available at https://doi.org/10.1109/EMC/SI/PI/EMCEurope52599.2021.9559334
2021 IEEE International Joint Electromagnetic Compatibility Signal and Power Integrity and EMC Europe Symposium, EMC/SI/PI/EMC Europe 2021 (2021: Jul. 26-Aug. 13, Raleigh, NC)
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Analytical Solution; Causality; Group Delay; High-Speed System; Multiple Reflections
International Standard Book Number (ISBN)
Article - Conference proceedings
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13 Aug 2021