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InterviewSolution
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Explain why a photodiode is usually operated under reverse bias. |
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Answer» During reverse bias the reverse saturation current due to minority charge carriers is small. When light is incident the fractional increase in minority charge carrier concentration is significant and is early measurable. If the photodiode is forward biased, under illumination the fractional increase in charge carriers is insignificant and is difficult to measure. Hence photodiode is usually operated in reverse bias. |
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