A) Emitter in lightly doped, collector is heavily doped and base in moderately doped.
B) Emitter in lightly doped, collector is moderately doped and base in heavily doped.
C) Emitter in heavily doped, collector is lightly doped and base in moderately doped.
D) Emitter in heavily doped, collector is moderately doped and base in lightly doped.
Correct Answer: D
Solution :
The emitter is heavily doped so that it can inject a large number of charge carrier (electrons or holes) into the base. The base is lightly carriers(electrons or holes) into y^) the base. The base is lightly doped, and very thin, it passes most of the emitter injected charge carriers to the collector. The collector is moderately doped.
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