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http://dx.doi.org/10.5369/JSST.2010.19.4.285

Operation of a wide dynamic range CMOS image sensor based on dual sampling mechanism and its SPICE simulation  

Kong, Jae-Sung (School of Electrical Engineering and Computer Science, Kyungpook National University)
Jo, Sung-Hyun (School of Electrical Engineering and Computer Science, Kyungpook National University)
Lee, Soo-Yeun (School of Electrical Engineering and Computer Science, Kyungpook National University)
Choi, Kyung-Hwa (Department of Sensor and Display Engineering, Kyungpook National University)
Seo, Sang-Ho (School of Electrical Engineering and Computer Science, Kyungpook National University)
Shin, Jang-Kyoo (School of Electrical Engineering and Computer Science, Kyungpook National University)
Publication Information
Journal of Sensor Science and Technology / v.19, no.4, 2010 , pp. 285-290 More about this Journal
Abstract
In this paper, a dynamic range(DR) extension technique based on a 3-transistor active pixel sensor(APS) and dual image sampling is proposed. The feature of the proposed APS is that the APS uses two or more photodiodes with different sensitivities, such as a high-sensitivity photodiode and a low-sensitivity photodiode. Compared with previously proposed wide DR(WDR) APS, the proposed approach has several advantages, such as no-external equipments or signal processing, no-additional time-requirement for additional charge accumulation, simple operation and adjustable DR extension by controlling parasitic capacitance and sensitivity of two photodiodes. Approximately 16 dB of DR extension was evaluated from the simulation for the situation of 10 times of sensitivity difference and the same size of parasitic capacitance between those two photodiodes.
Keywords
CMOS image sensor; dynamic range extension; photodiode; APS;
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Times Cited By KSCI : 3  (Citation Analysis)
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