Coarse-to-fine malleable Pole/Residue Equivalent System Solver (COMPRESS)

Frequency-domain models are often need to be converted to macromodels by approximating them as rational functions. Pole/Residue Equivalent System Solver (PRESS) is a method for such fitting of frequency response as poles/residues. In this paper, a modified PRESS method using non-consecutive sample subset based local fitting is presented. The proposed method reduces the number of iterations required, consequently improving the model order. A test case of package — signal and power plane interconnects — is demonstrated. The results show that the proposed method generates compact macromodels.