Abstract
This paper provides a solution for a self-powered light direction detection with digitized output. Light direction sensors, energy harvesting photodiodes, real-time adaptive tracking digital output unit and other necessary circuits are integrated on a single chip based on a standard 0.18 µm CMOS process. Light direction sensors proposed have an accuracy of 1.8 degree over a 120 degree range. In order to improve the accuracy, a compensation circuit is presented for photodiodes' forward currents. The actual measurement precision of output is approximately 7 ENOB. Besides that, an adaptive under voltage protection circuit is designed for variable supply power which may undulate with temperature and process.
Highlights
Attitude sensors are widely used in the aircraft’s orientation which usually depends on some reference vectors
This paper provides a solution for a self-powered light direction detection with digitized output
Energy harvesting photodiodes, real-time adaptive tracking digital output unit and other necessary circuits are integrated on a single chip based on a standard 0.18 μm CMOS process
Summary
Attitude sensors are widely used in the aircraft’s orientation which usually depends on some reference vectors. This paper provides a solution for a self-powered light direction detection with digitized output.
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