Question

photodiode when used as a detector in optical signal is operate under reverse bias . why?​

Answer 1

Answer:

Its resistance decreases as the frequency (intensity) of light increases when used as a detector a reverse biased potential is applied across this photoresistor in such a way that it should conduct as soon as a light ray or photons falls at its surface.

Explanation:

Answer 2

Answer:

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Explanation:

As fractional change in minority charge carriers is more than the fractional change in majority charge carriers, the variation in reverse saturation current is more prominent.