ABSTRACT

This chapter begins with presenting the six sets of two-port circuit equations, any one of which can be used to relate terminal voltages and currents of the circuit. Each of these sets of equations involves a corresponding set of parameters that characterize the circuit. The chapter interpretes the different sets of parameters in terms of terminal conditions of the circuit, and derives the relations between these different sets. It discusses two special types of two-port circuits, namely, reciprocal and symmetric circuits and presents some useful equivalent circuits based on two-port circuit equations. The chapter concerns two-port circuit analysis, starting with the derivation of two-port circuit parameters for composite circuits that result from combining two-port circuits in one of five possible ways: cascading, parallel, series, series–parallel, and parallel–series connections. It ends by analyzing a terminated two-port circuit in order to derive relations that are of particular interest in the analysis of electronic amplifier circuits.