Light sensing pixel sensor and method
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United States of America Patent
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Feb 13, 2007
Grant Date -
Dec 30, 2004
app pub date -
Jun 30, 2003
filing date -
Jun 30, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A photodetector (105) generates an electrical signal that has a value that changes approximately linearly at a rate that is proportional to an amount of light intensity incident on a photodetector since a most recent reset command was received at a reset input of the photodetector. A measurement circuit (110) generates a comparison state that is based on a comparison of the value of the photodetector signal to a reference signal in response to one of a plurality a sample pulses. A control circuit (160) generates the plurality of sample pulses at non-uniform time intervals and generates an elapsed time as an accumulation of the non-uniform time intervals occurring from the reset command to a change of the comparison state. In one embodiment, the reciprocal of an accumulated duration of the non-uniform time intervals is a linear function of a number of time intervals after the reset command.
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