Nonlinear four-terminal network in the presence of a multiple-frequency input

Nonlinear multiterminal networks differ from circuits with several nonlinear two-terminal networks in the fact that the nonlinear functions in the case of a multiterminal network depend on several variables. In this situation the solving of nonlinear problems requires a more complicated mathematical tool. In this paper we propose an extension of a tool developed for a nonlinear two-terminal network to the case of a resistive-capacitive nonlinear four-terminal network - the most widely used type of multiterminal network.