Light sensing circuit having programmable current source and method thereof
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United States of America Patent
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Feb 25, 2014
Grant Date -
Oct 7, 2010
app pub date -
Jan 15, 2010
filing date -
Apr 6, 2009
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Abstract
A light detecting circuit and a light detecting method thereof are provided. The light detecting circuit includes a first resistor, a light sensor, a current source, and a first current mirror. The light sensor generates a corresponding photocurrent according to the illumination while being illuminated by the high brightness light beam. By dividing the photocurrent corresponding to the low brightness light beam from the photocurrent through the current source, the light detecting circuit can mainly detects the high brightness light beam, so that the detecting accuracy can be enhanced. Accordingly, when being applied to detect the high brightness light beam, the light detecting circuit can provide a sensing voltage in a wide enough range and a large enough sense scale, so that the sensing voltage is easy to be distinguished by the rear stage.
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