A 76mW 500fps VGA CMOS Image Sensor with TimeStretched Single-Slope ADCs Achieving 1.95e- Random Noise

📋 论文概要

本文提出了一种采用时间拉伸单斜率ADC的VGA CMOS图像传感器，在76mW功耗下实现了500fps帧率和1.95e-随机噪声，解决了高帧率与低噪声难以兼顾的问题。

💡 主要创新点

• 提出时间拉伸单斜率ADC技术，通过在列并行ADC中引入时间拉伸机制，在不增加时钟频率的情况下提升转换速度，从而支持高帧率同时保持低噪声。
• 实现了76mW低功耗下VGA分辨率500fps的高速读出，且随机噪声低至1.95e-，达到高帧率与低噪声的平衡。

🏷 关键词

📄 原文摘要

Kumoh National Institute of Technology, Gyeongbuk, Korea 1 2 The demand for high-frame-rate CMOS image sensors is steadily increasing. Column-parallel single-slope (SS) ADCs are widely used in CMOS image sensors, because they can be implemented with small area, low noise, and high energy efficiency. To achieve high frame rate and low noise simultaneously, several techniques using SS ADCs, such as parallel multiple sampling [1,2], dual-gain slopes [3], and dual-gain amplifiers [4], have been investigated. However, since the clock frequency of the SS ADC is already in the GHz range, it is very challenging to maintain energy efficiency as the frame rate increases further. This paper presents a time-stretched (TS) SS ADC architecture for a high-framerate CMOS image sensor. In this architecture, a column-parallel time stretcher is proposed, where the time residue of the SS ADC is expanded to 16 times and the

👥 作者与机构

Injun Park1, Chanmin Park1, Jimin Cheon2, Youngcheol Chae1

Yonsei University, Seoul, Korea