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Proceedings Paper

Design of ultra-low-power readout circuit for UV GaN focal plane array
Author(s): Xiaojuan Li; Jiqiang Wang; Jing Xie; Ling Wang; Yan Zhang; Xiangyang Li
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Paper 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.

Paper Details

Date Published: 24 October 2017
PDF: 6 pages
Proc. SPIE 10462, AOPC 2017: Optical Sensing and Imaging Technology and Applications, 104624Z (24 October 2017); doi: 10.1117/12.2285685
Show Author Affiliations
Xiaojuan Li, Shanghai Institute of Technical Physics (China)
Jiqiang Wang, Shanghai Institute of Technical Physics (China)
Jing Xie, Shanghai Institute of Technical Physics (China)
Ling Wang, Shanghai Institute of Technical Physics (China)
Yan Zhang, Shanghai Institute of Technical Physics (China)
Xiangyang Li, Shanghai Institute of Technical Physics (China)


Published in SPIE Proceedings Vol. 10462:
AOPC 2017: Optical Sensing and Imaging Technology and Applications
Yadong Jiang; Haimei Gong; Weibiao Chen; Jin Li, Editor(s)

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