24 October 2017 Design of ultra-low-power readout circuit for UV GaN focal plane array
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Proceedings Volume 10462, AOPC 2017: Optical Sensing and Imaging Technology and Applications; 104624Z (2017) https://doi.org/10.1117/12.2285685
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China
Abstract
A Readout Integrated Circuit (ROIC) for GaN ultraviolet (UV) focal plane array (FPA) working in “solar-blind” band is studied in this paper. It has a format of 320×256 and a pixel pitch of 30μm. This circuit can operate both in integrating-while-reading (IWR) and integrating-then-reading (ITR) mode with the frame rate higher than 100fps. It is common that trade-offs always exist between chip power consumption and performances in integrated circuits design. In order to get high injection efficiency with small area and low power, A novel low-power capacitive-feedback trans-impedance amplifier (CTIA) with snapshot mode is designed for the proposed circuit. The smallest operational current of CTIA is only 10nA for 5V power supply. The total power consumption of ROIC is reduced significantly to 45mW with the ultra-low-power pixel. By adopting the 0.35μm 2P4M mixed signal process, the high-performance CTIA architecture can make two gain selections which charge capacities are 3.4Me - and 0.16Me - per pixel with 2.5 V output range. According to the experimental results, this circuit works well under 5V power supply and achieves 8MHz pixel-data-transmission rate.
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Xiaojuan Li, Jiqiang Wang, Jing Xie, Ling Wang, Yan Zhang, Xiangyang Li, "Design of ultra-low-power readout circuit for UV GaN focal plane array", Proc. SPIE 10462, AOPC 2017: Optical Sensing and Imaging Technology and Applications, 104624Z (24 October 2017); doi: 10.1117/12.2285685; https://doi.org/10.1117/12.2285685
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