An analog sun sensor has been designed based on shade profile proportional to the angle of incidence of incoming light projected onto a 2×2 array of photodiodes. This concept enables an autonomous self-powered optical system with two the main functions (electrical power generation for the amplifier and the optical position measurement) implemented in the photodiodes, by having these operated simultaneously in the photovoltaic and photocurrent mode respectively. The low-power current-to-voltage converter is used to readout the differential photocurrent, while powered from the photodiodes at minimum supply voltage level. Test structures have been designed, fabricated and used for validation of the concept. © 2009.
Wu, H., Emadi, A., de Graaf, G., Leijtens, J., & Wolffenbuttel, R. F. (2009). Self-Powered Sun Sensor Microsystems. In Procedia Chemistry (Vol. 1, pp. 1363–1366). https://doi.org/10.1016/j.proche.2009.07.340