Signal integrity analysis has become imperative for high-speed designs. In this paper, we present a new technique to advance Krylov-space based passive model-reduction algorithms to include lossy coupled transmission lines described by Telegrapher's equations. In the proposed scheme, transmission line subnetworks are treated with closed-form stamps obtained using matrix-exponential Pade, where the coefficients describing the model are compared a priori and analytically. In addition, a technique is given to ensure that the contribution of these stamps to the modified nodal analysis (MNA) formulation leads to guaranteed passive macromodel.

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Conference DAC 2000: 37th Design Automation Conference
Gad, Emad, Dounavis, Anestis, Nakhla, M.S, & Achar, R. (2000). Passive model order reduction of multiport distributed interconnects. In Proceedings - Design Automation Conference (pp. 526–531).