Discussion
Assertion (A) : A BJT is said to be operating in a saturation region if both the junctions are forward biased.
Reason (R) : In saturation region collector doping concentration is reduced.
Answer: C
The assertion is true and the reason is false, so option (C) is right. A bipolar junction transistor works in saturation when both the emitter-base junction and the collector-base junction are forward biased, and the collector current is then limited by the circuit and not by the base current, which makes the assertion correct. The reason, that the collector doping concentration is reduced in saturation, is wrong, because the doping of a transistor is fixed at manufacture and does not change with the bias. What does change in saturation is the amount of charge stored in the base and collector. Options (A) and (B) accept the reason, and option (D) rejects the assertion.
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