A 2.7e- Temporal Noise 99.7% Shutter Efficiency 92dB Dynamic Range CMOS Image Sensor with Dual Global Shutter Pixels

📋 论文概要

该论文提出了一种采用双全局快门像素结构的低噪声CMOS图像传感器，解决了传统5T全局快门像素中kTC噪声和暗电流大的问题，实现了2.7e-的时间噪声、99.7%的快门效率和92dB的动态范围。

💡 主要创新点

• 提出双全局快门像素结构，通过两阶段电荷转移有效抑制kTC噪声和暗电流。
• 实现了极低的时间噪声（2.7e-）和极高的快门效率（99.7%），同时保持92dB的高动态范围。

🏷 关键词

📄 原文摘要

A low-noise global shutter CMOS image sensor is a next challenge to expand the market for CMOS image sensors. A low-noise global electronic shutter can be used for various applications such as high-speed imaging, machine vision and mechanical shutterless digital still cameras. A commonly used five transistor (5T) global shutter pixel using a floating diffusion memory suffers from large temporal noise due to kTC noise (reset noise) and large dark current [1]. Twostage charge transfer pixels such as a seven transistor (7T) active pixel [2] and a dual pinned-diode active pixel presented by the authors [3] cancel the kTC noise. However, such structures have an issue of low shutter efficiency due to leakage from a photodiode to storage gate or diode. Furthermore, the 7T pixel suffers from dark current and transfer noise because of the use of surface-channel storage gates. The dual pinned-diode pixel of the previous design has problem of non-linearity due to poor charge transfer efficiency f

👥 作者与机构

Keita Yasutomi, Shinya Itoh, Shoji Kawahito

Shizuoka University, Hamamatsu, Japan