Question
A transistor works as an amplifier only when:
/>Solution
A transistor has three regions: the emitter, the base, and the collector, forming two p-n junctions: the emitter-base (EB) junction and the collector-base (CB) junction. The way these junctions are biased determines the operating region of the transistor. For a transistor to function as an amplifier, it needs to operate in the active region . Â In the active region:
- The emitter-base junction is forward biased . This allows a large number of majority carriers from the emitter to flow into the base. Â
- The collector-base junction is reverse biased . This creates a potential barrier that attracts the minority carriers (that have diffused through the base from the emitter) towards the collector, resulting in a collector current that is controlled by the base current.
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