Transistor Amplifiers Part I and Part II

Abstract

The following treatment is given as a preliminary simplified study of the transistor as an amplifier. The discussion is approximate in that internal feedback is neglected and the output impedance of the transistor is so large in comparison with the load impedance that it may be neglected. These approximations are found perfectly acceptable for low resistance loads up to something like $000 ohms, when the parameters of a particular transistor are known by measurement. If a manufacturer's average parameters are used, this simplified treatment is all that is warranted in calculation of the performance of this transistor type in an amplifier circuit, if the load resistance is perhaps not greater than 10,000 ohms. The simplified treatment will apply to both the common base and common emitter configurations.