Transistor
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PhotodiodesA photodiode consists of an active p-n junction which is operated in reverse bias. When light falls on the junction, a reverse current flows which is proportional to the illuminance. The linear response to light makes it an element in useful photodetectors for some applications. It is also used as the active element in light-activated switches.
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Photodiode
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Photodiode Characteristics
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Photodiode CharacteristicsThe reverse current through a photodiode varies linearly with illuminance once you are significantly above the dark current region.
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