A vision sensor with on-pixel ADC and in-built light adaptation mechanism

被引：27

作者：

Bermak, A ^{[1
]}

Bouzerdoum, A ^{[1
]}

Eshraghian, K ^{[1
]}

机构：

[1] Edith Cowan Univ, Sch Engn & Math, Perth, WA 6027, Australia

来源：

MICROELECTRONICS JOURNAL | 2002年 / 33卷 / 12期

关键词：

CMOS vision sensors; CMOS imagers; light adaptation; VLSI; pulse frequency modulation;

D O I：

10.1016/S0026-2692(02)00114-3

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper we propose an on-pixel Analogue-to-Digital Converter (ADC) based on pulse frequency modulation (PFM) scheme. This PFM based converter presents a viable solution for pixel-level based ADC. It uses a simple and robust circuit that can be implemented in a compact area resulting in a 23% fill-factor for a digital vision sensor in 0.25 mum CMOS technology. An in-built light adaptation mechanism has also been implemented which allows the sensor to better adapt to low-light intensity or to adjust the sensor saturation level. As a consequence, the proposed sensor features a programmable dynamic range. Image lag is eliminated since a reset of the photodetector is performed after the conversion period. A prototype comprising a 32 X 32 pixel array has been implemented in CMOS 0.25 mum technology. Each pixel occupies an area of 45 X 45 mum(2) with an average power consumption of 85 LW per pixel. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1091 / 1096

页数：6

共 15 条

[1]

Bermak A, 2000, ISCAS 2000: IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS - PROCEEDINGS, VOL V, P293, DOI 10.1109/ISCAS.2000.857422

[2] SURFACE PASSIVATION OF BACKSIDE-ILLUMINATED INDIUM-ANTIMONIDE FOCAL PLANE ARRAY [J].