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Sensors 2016, 16(7), 999; doi:10.3390/s16070999

A 75-ps Gated CMOS Image Sensor with Low Parasitic Light Sensitivity

Key Laboratory of Optoelectronic Devices and Systems of Education Ministry and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
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Author to whom correspondence should be addressed.
Academic Editor: Gonzalo Pajares Martinsanz
Received: 3 April 2016 / Revised: 19 June 2016 / Accepted: 22 June 2016 / Published: 29 June 2016
(This article belongs to the Special Issue Imaging: Sensors and Technologies)
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Abstract

In this study, a 40 × 48 pixel global shutter complementary metal-oxide-semiconductor (CMOS) image sensor with an adjustable shutter time as low as 75 ps was implemented using a 0.5-μm mixed-signal CMOS process. The implementation consisted of a continuous contact ring around each p+/n-well photodiode in the pixel array in order to apply sufficient light shielding. The parasitic light sensitivity of the in-pixel storage node was measured to be 1/8.5 × 107 when illuminated by a 405-nm diode laser and 1/1.4 × 104 when illuminated by a 650-nm diode laser. The pixel pitch was 24 μm, the size of the square p+/n-well photodiode in each pixel was 7 μm per side, the measured random readout noise was 217 e rms, and the measured dynamic range of the pixel of the designed chip was 5500:1. The type of gated CMOS image sensor (CIS) that is proposed here can be used in ultra-fast framing cameras to observe non-repeatable fast-evolving phenomena. View Full-Text
Keywords: CMOS image sensor (CIS); gated imager; snapshot imager; ultra-fast global shutter; framing camera; low parasitic light sensitivity; high shutter efficiency CMOS image sensor (CIS); gated imager; snapshot imager; ultra-fast global shutter; framing camera; low parasitic light sensitivity; high shutter efficiency
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, F.; Niu, H. A 75-ps Gated CMOS Image Sensor with Low Parasitic Light Sensitivity. Sensors 2016, 16, 999.

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