Photo detector with compensated output and method involving same
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United States of America Patent
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Oct 27, 2009
Grant Date -
Jan 4, 2007
app pub date -
Jun 28, 2006
filing date -
Jun 30, 2005
priority date (Note) -
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Abstract
A method of compensating a photo sensor (and a corresponding photo sensor with compensation) insures the accuracy of the photo sensor, e.g., over environmental variations or photo cell variations. The method comprises: providing a first signal indicative of a light level; providing a second signal indicative of an environmental parameter, e.g., temperature; and calculating, responsive to the first signal and the second signal, a compensated signal that is indicative of an absolute light level. The calculating can be performed by a processor and utilize calibration and compensation information or parameters, which can be obtained experimentally.
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