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Re: Photodiode installed polarity?

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  • smilingcat90254
    Well lets get few things straightened out here. You can run the photodiode in one of two modes. As a solar cell, aka photovoltaic mode. No bias voltage is
    Message 1 of 7 , Jan 30, 2013
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      Well lets get few things straightened out here.

      You can run the photodiode in one of two modes. As a solar cell, aka photovoltaic mode. No bias voltage is applied and the diode generates its own open circuit voltage. This mode has its application.

      Second mode of operation is called photoconductive mode. The diode is reverse biased. This mode is used for fiber optic communication where hi-speed response is very important.

      There are other reasons for choosing one mode or the other, but both modes of operation have their advantages and disadvantages.

      Photoconductive mode is bit harder to understand; but, it is used widely. You can find reference design in Burr-Brown, Analog Devices and Linear Tech.
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