The Charge-Control Concept in the Form of Equivalent Circuits, Representing a Link Between the Classic Large Signal Diode and Transistor Models

Abstract

It is shown in this paper that the charge-control concept can be conceived as a special form of the Linvill model for semiconductors. Instead of mathematical tools, charge-control models become equivalent circuits amenable to ordinary network analysis techniques. In the simplest form, the charge-control equivalent circuit for the junction transistor is fully equivalent to the Linvill and the Beaufoy-Sparkes model. For all practical purposes, it is also equivalent to the Ebers-Moll model. The charge-control junction transistor equivalent circuit combines those features of the other models that are important for electrical engineering applications. It also permits the conversion between the three basic types of models. Because of its close relationship to the physical processes governing a device, it can readily be extended to higher-order phenomena. This is usually done by expressing a Linvill-type lumped model in terms of charge parameters. The charge-control equivalent circuit can be useful for modeling a variety of semiconductor devices.