System and method for measuring the output of a photodetector and for reducing sensitivity to temperature variations
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United States of America Patent
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Jun 8, 2010
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app pub date -
Feb 28, 2008
filing date -
Feb 28, 2008
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Abstract
A system for measuring the output of a photodetector is disclosed. An integrating amplifier circuit receives a signal output from the photodetector and is adapted to output an integrating amplifier voltage proportional to the signal output from the photodetector. A reference source is adapted to serve as a voltage source and is adapted to output a reference voltage proportional to background light incident upon the photodetector. A difference amplifier electronically coupled to the integrating amplifier circuit and to the adjustable reference, receiving the integrating amplifier voltage and the reference voltage, respectively. The difference amplifier is adapted to generate an amplified output using the reference voltage subtracted from the integrating amplifier voltage.
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