Matrix Representation of Transistor Circuits

The paper outlines a method to treat transistors as 3-terminal "black boxes," represented by their admittance matrices. Instead of using an equivalent circuit with internal sources, the treatment is direct and uses only measurable quantities. Once the admittance matrix of the grounded-base transistor is measured, it is easy to derive the matrices for grounded-emitter and grounded-collector stages. Matrix representation also presents a direct method for analyzing cascaded stages. The method is illustrated by an analysis of circuits with a transistor that has been described elsewhere.