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Why is phototransistor reverse biased?

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Why is phototransistor reverse biased?

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Photodiodes are reverse biased to compress the space-charge region and reduce the junction capacitance. This allows higher bandwidth. ... Light acts as the base current, so in an NPN phototransistor the collector would have a positive voltage applied, maybe through a resistive load, while the emitter could be grounded.Mar 14, 2016

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