(definition) Effect of recombination currents. High injection effects also shown. Note: recombination does not contribute.

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Presentation transcript:

(definition)

Effect of recombination currents. High injection effects also shown. Note: recombination does not contribute to Ic!

General behavior of β (hFE) as a function of collector current (from Sze). Low currents: Recombination currents dominate (just as in diode). High currents: High injection effects (increases effective base doping) and series resistance effects increase.

This looks good, but: Only part of the emitter is active, but the whole emitter contributes capacitance. High current density reduces current gain.