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Semiconductor Electronics: Materials, Devices and Simple Circuits
Transistor Biasing
1 question from 1 paper, each with its answer.
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Concepts tested
- Active region biasing of npn transistor
All Questions
2003 AIPMT 1 question
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A n-p-n transistor conducts whenA transistor conducts (in the active region) when the emitter-base junction is forward biased and the base-collector junction is reverse biased.
In an n-p-n transistor, the emitter is n-type and the base is p-type. Forward bias of the emitter-base junction means the base (p) is positive with respect to the emitter (n), i.e. the emitter is negative with respect to the base.
Reverse bias of the base-collector junction means the collector (n) is positive with respect to the base (p).
So the n-p-n transistor conducts when the collector is positive and the emitter is negative with respect to the base.