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http://dx.doi.org/10.5369/JSST.2013.22.4.256

Extension of the Dynamic Range in the CMOS Active Pixel Sensor Using a Stacked Photodiode and Feedback Structure  

Jo, Sung-Hyun (School of Electronics Engineering, Kyungpook National University)
Lee, Hee Ho (School of Electronics Engineering, Kyungpook National University)
Bae, Myunghan (School of Electronics Engineering, Kyungpook National University)
Lee, Minho (School of Electronics Engineering, Kyungpook National University)
Kim, Ju-Yeong (School of Electronics Engineering, Kyungpook National University)
Choi, Pyung (School of Electronics Engineering, Kyungpook National University)
Shin, Jang-Kyoo (School of Electronics Engineering, Kyungpook National University)
Publication Information
Journal of Sensor Science and Technology / v.22, no.4, 2013 , pp. 256-261 More about this Journal
Abstract
This paper presents an extension of the dynamic range in a complementary metal-oxide-semiconductor (CMOS) active pixel sensor (APS) using a stacked photodiode and feedback structure. The proposed APS is composed of two additional MOSFETs and stacked P+/N-well/P-sub photodiodes as compared with a conventional APS. Using the proposed technique, the sensor can improve the spectral response and dynamic range. The spectral response is improved using an additional stacked P+/N-well photodiode, and the dynamic range is increased using the feedback structure. Although the size of the pixel is slightly larger than that of a conventional three-transistor APS, control of the dynamic range is much easier than that of the conventional methods using the feedback structure. The simulation and measurement results for the proposed APS demonstrate a wide dynamic range feature. The maximum dynamic range of the proposed sensor is greater than 103 dB. The designed circuit is fabricated by the $0.35-{\mu}m$ 2-poly 4-metal standard CMOS process, and its characteristics are evaluated.
Keywords
Feedback; Spectral response; Extension of dynamic range; Stacked photodiode;
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Times Cited By KSCI : 2  (Citation Analysis)
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