Passive model reduction of multiport distributed interconnects

Signal integrity analysis has become imperative for high-speed designs. In this paper, we present a new technique to advance Krylov-space-based passiv e model-reduction algorithms to include distributed interconnects described by telegrapher's equations. Interconnects can be lossy, coupled, and can i nclude frequency-dependent parameters. 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 computed a priori and analytically. In addition, a technique is given to guarantee that the contribution of these stamps to the modified nodal analysis formul ation leads to a passive macromodel.