The Characteristic Frequencies of a Drift Transistor†

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Abstract
Certain conventionally defined characteristic frequencies of a drift transistor are related to each other, to the basic transistor parameters, and to minority carrier time constants, using the theory of the simple one-dimensional model. The Frequencies are the common emitter and common base cut-off frequencies, and the frequency at which the magnitude of the common emitter short circuit current gain is unity; the minority carrier time constants are the effective lifetime, the average transit time, and the average time of stay in the base. Several approximations for the frequency variation of the current gains are given, and used to find how junction capacitances and base resistance affect the measurement of the characteristic frequencies. Finally the maximum frequency of oscillation is discussed, and the high-frequency figure of merit redefined in a way compatible with the conventional definition.

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