Discussion
Statement I: A varactor diode is operated in reverse bias.
Statement II: A photodiode is normally operated in forward bias.
In the light of the above statements, choose the correct answer.
Answer: B
The first is correct and the second is not: a photodiode is normally reverse biased, so that the light-generated current flows against a wide depletion region and the response is fast and linear. Both devices exploit properties of the reverse-biased junction - one its capacitance, the other its light-dependent leakage. Grouping the special diodes by which bias region they use is a compact way to keep them straight. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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