题目/Title：
                        Pixel-level A/D conversion using voltage reset technique

作者/Author：李敏增,李福乐,张春,王志华
                        Minzeng Li,Fule Li,Chun Zhang,Zhihua Wang

期刊/Journal：半导体学报 Journal of Semiconductors

年份/Issue Date：2014.Nov.

卷（期）及页码/Volume（No.）&pages：Vol.35, No.11, pp. 115009-1-5

摘要/Abstract：

This paper presents a 50 Hz 15-bit analog-to-digital converter (ADC) for pixel-level implementation in CMOS image sensors. The ADC is based on charge packets counting and adopts a voltage reset technique to inject charge packets. The core circuit for charge/pulse conversion is specially optimized for low power, low noise and small area. An experimental chip with ten pixel-level ADCs has been fabricated and tested for verification. The measurement result shows a standard deviation of 1.8 LSB for full-scale output. The ADC has an area of 45 × 45 μm2 and consumes less than 2 μW in a standard 1P-6M 0.18 μm CMOS process.