Light source frequency detection circuit for image sensor
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United States of America Patent
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Oct 20, 2009
Grant Date -
Mar 19, 2009
app pub date -
Sep 14, 2007
filing date -
Sep 14, 2007
priority date (Note) -
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Abstract
An apparatus for measuring the power frequency of a light source includes a photo-sensor, a modulator, and a logic unit. The photo-sensor generates an electrical signal that is responsive to light incident thereon from the light source. The modulator generates a modulated signal based on the electrical signal that toggles at a rate substantially proportional to the power frequency of the light source. The logic unit is coupled to receive the modulated signal and determine its toggling frequency.
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