A General Network Representation for Three-Terminal Active Devices

Using the properties of the redundant admittance matrix described by Shekel, it is possible to develop a general network representation for an active three-terminal device. In the course of the analysis, the unilateral admittance is developed. This element, which represents part of the active nature of a three-terminal device, may be treated as a passive element when writing circuit equations. The general representation is identical for both vacuum tubes and transistors.