21 February 2007 Linear-logarithmic image sensor with low noise and no flickers
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Abstract
This paper proposes and demonstrates a linear-logarithmic image sensor that can operate in both the linear and logarithmic modes, and exhibits low noise and no flickers. Its pixel is composed of one buried-photodiode, five n-channel MOS transistors, two p-channel MOS transistors, and one capacitor. During the linear mode operation, the pixel behaves the same as the four-transistor one, offering a low dark current and low noise. Also, in the logarithmic mode, it operates in an integrating manner in contrast to the majority of logarithmic-response CMOS image sensors that operate in a continuous manner. Thus it has no flickers and can calibrate the fixed pattern noise using the reference level. A wide dynamic range of 190 dB has been confirmed with a 256 × 256-pixel image sensor employing this novel pixel architecture.
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Shigehiro Miyatake, Masayuki Kusuda, Tsuyoshi Iwamoto, Tetsuya Katagiri, Koichi Kamon, Kazuchika Sato, Yasuaki Serita, "Linear-logarithmic image sensor with low noise and no flickers", Proc. SPIE 6501, Sensors, Cameras, and Systems for Scientific/Industrial Applications VIII, 65010I (21 February 2007); doi: 10.1117/12.711254; https://doi.org/10.1117/12.711254
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