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http://dx.doi.org/10.46670/JSST.2021.30.1.61

2500 fps High-Speed Binary CMOS Image Sensor Using Gate/Body-Tied Type High-Sensitivity Photodetector  

Kim, Sang-Hwan (School of Electronic and Electrical Engineering, Kyungpook National University)
Kwen, Hyeunwoo (School of Electronic and Electrical Engineering, Kyungpook National University)
Jang, Juneyoung (School of Electronic and Electrical Engineering, Kyungpook National University)
Kim, Young-Mo (School of Electronic and Electrical Engineering, Kyungpook National University)
Shin, Jang-Kyoo (School of Electronic and Electrical Engineering, Kyungpook National University)
Publication Information
Journal of Sensor Science and Technology / v.30, no.1, 2021 , pp. 61-65 More about this Journal
Abstract
In this study, we propose a 2500 frame per second (fps) high-speed binary complementary metal oxide semiconductor (CMOS) image sensor using a gate/body-tied (GBT) p-channel metal oxide semiconductor field effect transistor-type high-speed photodetector. The GBT photodetector generates a photocurrent that is several hundred times larger than that of a conventional N+/P-substrate photodetector. By implementing an additional binary operation for the GBT photodetector with such high-sensitivity characteristics, a high-speed operation of approximately 2500 fps was confirmed through the output image. The circuit for binary operation was designed with a comparator and 1-bit memory. Therefore, the proposed binary CMOS image sensor does not require an additional analog-to-digital converter (ADC). The proposed 2500 fps high-speed operation binary CMOS image sensor was fabricated and measured using standard CMOS process.
Keywords
CMOS image sensor; Binary operation; Gate/Body-Tied photodetector; High-speed operation;
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