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Research on high-speed TDICCD remote sensing camera video signal processing

The Journal of China Universities of Posts and Telecommunications 2009年第3期16卷 95-102页

作者： ZHANG Da XU Shu-yan MENG Qing-ju Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China Graduate School of Chinese Academy of Sciences Beijing 100039 China College of Electronic science & Engineering Jilin University Changchun 130012 China

Video signal processing needs high signal-to-noise ratio （SNR） in high-speed time delay and integration charge coupled devices （TDICCD）. To solve this problem, this article first analyzes the characteristics of the output video signal of a new type of high-speed TDICCD and its operation principle. Then it studies the correlation double sample （CDS） method of reducing noise. Following that a synthesized processing method is proposed, including correlation double sample, programmable gain control, line calibration and digital offset control, etc. Among the methods, XRD98L59 is a video signal processor for the charge coupled device （CCD）. Application of this processor to one kind of high-speed TDICCD with eight output ports achieves perfect video images. The experiment result indicates that the SNR of the images reaches about 50 dB. The video signal processing for high-speed multi-channel TDICCD is implemented, which meets the required project index.

关键词： charge coupled device correlated double sample programmable gain control digital offset control

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A low-power high-quality CMOS image sensor using 1.5 V 4T pinned photodiode and dual-CDS column-parallel single-slope ADC

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Journal of Semiconductors 2022年第8期43卷 53-59页

作者： Wenjing Xu Jie Chen Zhangqu Kuang Li Zhou Ming Chen Chengbin Zhang Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Will Semiconductor Co.Ltd. Shanghai 201210China

This paper presents a low-power high-quality CMOS image sensor(CIS)using 1.5 V 4T pinned photodiode(4T-PPD)and dual correlated double sampling(dual-CDS)column-parallel single-slope ADC.A five-finger shaped pixel layer is proposed to solve image lag caused by low-voltage ***-CDS is used to reduce random noise and the nonuniformity between ***-mode counting method is proposed to improve circuit robustness.A prototype sensor was fabricated using a 0.11μm CMOS *** results show that the lag of the five-finger shaped pixel is reduced by 80%compared with the conventional rectangular pixel,the chip power consumption is only 36 mW,the dynamic range is 67.3 dB,the random noise is only 1.55 e^(-)_(rms),and the figure-of-merit is only 1.98 e^(-)·nJ,thus realizing low-power and high-quality imaging.

关键词： CMOS image sensor 4T pinned photodiode single-slope ADC correlated double sample counting method

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