Abstract
An apparatus allowing a straightforward determination of the π equivalent circuit of alloy junction transistors is described. The principle of measurement is based on the simulation of wave forms. The possibility of a simple determination of the equivalent circuit at any working point of the transistor enables a rapid evaluation of the current or voltage dependence of the circuit elements. The equipment, having an upper frequency limit of 10 Mc, can be used for transistors of much higher alpha cutoff frequencies, since for the measurements the common emitter configuration is chosen. Examples are given to demonstrate how some physical and dimensional values of the transistor can be calculated from the measured parameters.
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