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- Title
Wide dynamic range linear-logarithmic CMOS image sensor using photogate and cascode MOSFET.
- Authors
Bae, M.; Jo, S.-H.; Choi, B.-S.; Lee, H. H.; Choi, P.; Shin, J.-K.
- Abstract
A wide dynamic range CMOS image sensor is proposed, exhibiting a linear response at a low illumination level and a logarithmic response at a high illumination level. To maintain high sensitivity and to improve the dynamic range of the proposed pixel, a cascode MOSFET is integrated into the structure of the proposed pixel, along with a photogate. The applied photogate voltage reduces the sensitivity of the proposed pixel under the linear response regime, at a moderate illumination level. Under high illumination levels, the biased cascode MOSFET serves as a voltage-light-dependent active load and is responsible for logarithmic operation. The dynamic range of the proposed pixel can be improved by adjusting the sensitivity and the basis of the logarithmic response.
- Subjects
COMPLEMENTARY metal oxide semiconductors; METAL oxide semiconductor field-effect transistors; IMAGE sensors; LOGIC circuits; DIGITAL electronics
- Publication
Electronics Letters (Wiley-Blackwell), 2016, Vol 52, Issue 3, p198
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/el.2015.2907