Time-domain and frequency-domain macromodeling: application to package structures

This paper applies different macromodeling strategies for the generation of SPICE-ready equivalent circuits of complex multiport package structures. In particular, accuracy comparisons are performed between two techniques capable of processing either time-domain or frequency-domain responses for the derivation of the macromodel. The time-domain tool is an implementation of a Subspace-based State-Space System Identification (4SID) technique specifically designed for the analysis of structures with a large number of ports. The frequency-domain tool is the powerful pole relocation algorithm known as Vector Fitting. The two methods are compared through application to a realistic package example. The passivity of the macromodels is enforced using a powerful technique based on perturbation of associated Hamiltonian matrices.