Abstract
Common-emitter current gain is measured by comparing the voltages across equal resistors, 10 ω or 75 ω, in the base and collector paths. Coaxially housed tubular high stability carbon resistors are used in a structure which presents a uniform resistance up to 300 Mc/s. The voltages across the resistors are compared by feeding them to a detector via accurately balanced capacitors of about 0.5 pF incorporated in the test jig. Construction and performance of the equipment are described and correction formulae are given relating the measured current gain to the parameter f1. Measurements made on several very high frequency transistors using the test jig and an alternative method employing high grade commercial apparatus showed satisfactory agreement.
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