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Large-Signal Behavior of Junction Transistors

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2 Author(s)
Ebers, J.J. ; Bell Telephone Labs. Inc., Murray Hill, N.J. ; Moll, J.L.

In the consideration of the junction transistor as a switch there are three characteristics of primary interest, the open impedance, the closed impedance, and the switching-time. A generalized two-terminal-pair theory of junction transistors is presented which is applicable, on a dc basis, in all regions of operation. Using this theory, the open and closed impedances of the transistor switch are expressible in terms of easily measurable transistor parameters. For the ideal transistor these parameters are the saturation currents of the emitter and collector junctions and the normal and inverted alphas. The transition of the transistor switch from open to closed, or vice versa, is discussed, including the effects of minority carrier storage. This transition can be expressed in analytic form in terms of the alphas and the normal and inverted alpha cut-off frequencies.

Published in:

Proceedings of the IRE  (Volume:42 ,  Issue: 12 )