Generation of parameterized macromodels of two-port RF circuits for SPICE simulator

This paper presents a three step procedure for creating a small signal parameterized circuit model of a two-port RF module characterized in frequency domain. First, Vector Fitting is used to find rational approximation of Y matrix entries. Second, RLC equivalent circuits are synthesized for each approximation and complimented with the controlled sources. Finally the RLC components are parameterized with operating conditions of the original two-port module. The procedure is illustrated for the case of an RF amplifier for which the generated model is shown to be useful for the small signal SPICE analysis both in frequency and time domain.