Recently, several time-domain passive macromodeling algorithms were proposed for distributed transmission-line networks. Most of them employ some kind of approximation in the frequency domain to match the response up to a maximum frequency of interest and the behavior after the highest frequency is generally not considered. This can cause significant errors in transient responses (especially in the early-time period). In order to address this difficulty, we will present a new algorithm to reduce high-frequency errors in time-domain macromodels, while preserving passivity. The proposed algorithm is very useful in eliminating spurious ripples in the flat delay portion of transient responses of distributed transmission-line networks without needing to increase the order of approximation.

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Keywords Circuit simulation, Distributed networks, High-speed interconnects, Model-reduction, Printed circuit boards, Transient analysis, Transmission lines
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Journal IEEE Transactions on Microwave Theory and Techniques
Dounavis, A. (Anestis), Achar, R, & Nakhla, M.S. (2002). Addressing transient errors in passive macromodels of distributed transmission-line networks. In IEEE Transactions on Microwave Theory and Techniques (Vol. 50, pp. 2759–2768). doi:10.1109/TMTT.2002.805130