Optical measurement system incorporating ambient light component nullification
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United States of America Patent
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Feb 12, 2019
Grant Date -
Feb 2, 2017
app pub date -
Apr 29, 2016
filing date -
Jul 31, 2015
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Abstract
An optical measurement system is provided for performing time-of-flight distance measurement with ambient light suppression. The system has a detector circuit that includes a photodetector and an additional current gain element that amplifies the photocurrent produced by the photodetector. Placement of the additional current gain element near the photodetector allows low-power optical signals to be detected without amplifying noise from sources of the system that are outside of the detector circuit, thereby allowing a high signal-to-noise ratio to be achieved. Embodiments of the system include circuitry that automatically regulates the bias voltage of the photodetector to compensate for temperature and for fabrication process variations.
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