Wideband Circuit Extraction for Complex Multiport Interconnects

This paper is aimed at the extraction of lumped equivalent circuits for complex interconnect structures like packages and connectors that are used for high data-rate applications. Such structures are characterized by a high geometrical complexity and by a large number of ports. These features, combined with the requirement of a wideband characterization, pose serious challenges for the extraction of lumped macromodels that are able to reproduce in an accurate and efficient way the input-output port behavior of the interconnect. The macromodeling procedure that we propose in this paper is based on time-domain characterization. The macromodel is constructed through the following steps. First, a CAD-level geometrical description of the structure is imported into a full-wave electromagnetic solver. We use here a solver based on the Finite Integration method [2]. The structure is discretized using a suitable mesh and solved in timedomain. The employed solver allows to excite separately the ports using bandlimited pulses, producing a complete set of transient scattering responses. The iteration of this procedure leads to a full matrix of port responses excited by a single source placed on one port at the time. These responses provide the raw input to the core of the macromodeling algorithm. The macromodel extraction is performed by a