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Sensors 2017, 17(7), 1497; doi:10.3390/s17071497

A Multi-Resolution Mode CMOS Image Sensor with a Novel Two-Step Single-Slope ADC for Intelligent Surveillance Systems

1
Department of Semiconductor Science, Dongguk University-Seoul, Seoul 04620, Korea
2
Department of Information and Telecommunication Engineering, Dongguk University-Seoul, Seoul 04620, Korea
*
Author to whom correspondence should be addressed.
Received: 9 May 2017 / Revised: 8 June 2017 / Accepted: 24 June 2017 / Published: 25 June 2017
(This article belongs to the Special Issue Image Sensors)
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Abstract

In this paper, we present a multi-resolution mode CMOS image sensor (CIS) for intelligent surveillance system (ISS) applications. A low column fixed-pattern noise (CFPN) comparator is proposed in 8-bit two-step single-slope analog-to-digital converter (TSSS ADC) for the CIS that supports normal, 1/2, 1/4, 1/8, 1/16, 1/32, and 1/64 mode of pixel resolution. We show that the scaled-resolution images enable CIS to reduce total power consumption while images hold steady without events. A prototype sensor of 176 × 144 pixels has been fabricated with a 0.18 μm 1-poly 4-metal CMOS process. The area of 4-shared 4T-active pixel sensor (APS) is 4.4 μm × 4.4 μm and the total chip size is 2.35 mm × 2.35 mm. The maximum power consumption is 10 mW (with full resolution) with supply voltages of 3.3 V (analog) and 1.8 V (digital) and 14 frame/s of frame rates. View Full-Text
Keywords: CMOS image sensor; fixed pattern noise; intelligent surveillance system (ISS); low power consumption; multi-mode pixel resolution; two-step single-slope ADC CMOS image sensor; fixed pattern noise; intelligent surveillance system (ISS); low power consumption; multi-mode pixel resolution; two-step single-slope ADC
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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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Kim, D.; Song, M.; Choe, B.; Kim, S.Y. A Multi-Resolution Mode CMOS Image Sensor with a Novel Two-Step Single-Slope ADC for Intelligent Surveillance Systems. Sensors 2017, 17, 1497.

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