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BACK_BIASED_GaAsP_LED_OPERATES_AS_LIGHT_SENSOR

2014-11-16 19:52  
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BACK_BIASED_GaAsP_LED_OPERATES_AS_LIGHT_SENSOR
Using a simple 741 amplifier connected as a current-to-voltage converter with the LED as the current source, the voltage at the output is proportional to incident light. The junction is biased only by the difference between the summing node junction potential and ground, preventing the possibility of reverse break-down. The photon-generated current equals the short-circuit current of the junction, which is linearly related to incident light. The sensor requires a level of incident illumination that depends on the degree of opacity of the LED package.