An Analysis of Transient Response of Junction Transistor Amplifiers

Abstract

An exact solution of the one-dimensional diffusion equation as is applicable to a junction type of transistor has been obtained by the method of Laplace's transform. The solution has been utilized to derive an expression for the short-circuited output collector current with a step input forcing function. The time-independent part of this expression is found to be identical with the relation for steady state collector current as given earlier by Shockley. Experimental results on the transient response of Philips OC70 junction transistor have been shown to agree closely with the response obtained theoretically. It is concluded that under ordinary condition of operation the major physical process underlying transistor action must be the diffusion of minority carrier across the base region.