Network theorems for transistor circuits

A method for simplifying transistor amplifier circuits by means of diagram transformations is presented. It is based on several network theorems that are not well known. These are: the source splitting theorem, which facilitates subsequent circuit simplification; the controlled-source substitution theorem, which eliminates controlled sources in a one-port; and the controlled-source reduction theorem, which eliminates controlled sources in a two-port. All of these theorems come in dual pairs. The technique permits the analysis of the circuits covered in introductory courses with minimum mathematics and without the need for prior insight