A parallel Vector Fitting implementation for fast macromodeling of highly complex interconnects

The so-called Vector Fitting algorithm computes a rational approximation of the transfer matrix for linear multiport elements, starting from input-output data. This rational form is compatible with standard circuit solvers, thus enabling circuit-based Signal Integrity simulation flows. In this work, we document the first parallel Vector Fitting implementation for shared memory architectures. The results show close-to-ideal speedup factors and demonstrate the feasibility of almost real-time generation of macromodels for highly complex interconnect structures, with up to 160 ports.