A comparative study of stacked-diode configurations operating in the photovoltaic region R. Gómez-Merchán, D. Palomeque-Mangut, J.A. Leñero-Bardallo, M. Delgado-Restituto and A. Rodríguez-Vázquez Journal Paper · IEEE Sensors Journal, vol. 20, no. 16, pp 9105-9113, 2020 resumendoi
This article presents a detailed comparative analysis of two possible stacked-diode configurations operating as solar cells. The performance of a single p-well - deep n-well diode is compared with the combination of such diode with a n-diff - pwell diode in parallel. Both configurations occupy the same area but offer different performance and, accordingly, they can have different application scopes. A test circuit to gauge the diodes performance and their spectral sensitivity has been integrated along with the two diode configurations in a 0.18 μm CMOS standard fabrication technology. The measured experimental results for the two diode configurations under study are validated with an analytical diode physical model.
A high-speed low-power sun sensor with solar cells and continuous operation R. Gomez-Merchan, M. López-Carmona, J.A. Leñero-Bardallo and A. Rodríguez-Vázquez Conference · European Solid-State Circuits Conference ESSCIRC 2021 resumen
A novel sun sensor concept is presented. Photodiodes operating as solar cells with continuous operation and dedicated logic to calculate the centroid position are integrated to achieve lower latency and energy consumption. The output data flow is remarkably reduced because the centroid of the illuminated pixels is the only sensor output data. It overcomes conventional digital sun sensors based on Active Pixel Sensor (APS) pixels and Address Event Representation (AER) in terms of latency and power consumption. Its latency is in the order of microseconds with an average power consumption lower than 100 uW. Experimental results are provided and benchmarked.