对像素平行单段ADC随机噪声的改进,考虑到闪噪声效应
Masayuki Uno1, Kwuang-Han Chang2, Tsung-Hsun Tsai3
1Brillnics Japan Inc., 6-21-12 Minami-Oi, Shinagawa-ku, Tokyo 140-0013, Japan.
Sensors (Basel, Switzerland)
|December 31, 2025
概括
我们开发了一种低随机噪声的设计,用于小像素的单坡模拟数字转换器 (SS-ADC). 这种设计实现了2.2 e-rms的噪声,这对于先进的数字像素传感器至关重要.
科学领域:
- 传感器技术 传感器技术
- 集成电路设计 集成电路设计
- 噪声分析 噪声分析
背景情况:
- 数字像素传感器 (DPS) 由于区域限制而面临噪声方面的挑战.
- 闪噪声 (FN) 是DPS的重要贡献者,影响性能.
- 减少随机噪声 (RN) 对于提高传感器灵敏度和数据质量至关重要.
研究的目的:
- 为像素平行单斜坡模拟数字转换器 (SS-ADC) 提出和演示低随机噪声 (RN) 设计.
- 分析对比器偏移电流和带宽限制电容对DPS基于AC的RN估计的影响.
- 为了提供对小像素DPS设计的最佳区域布局的见解.
主要方法:
- 开发了一种基于交流的随机噪声 (RN) 估计方法,考虑了比较器偏移电流和带宽限制电容.
- 导出了一个简洁的方程来估计闪噪声 (FN) 与热噪声 (TN) 的比率,考虑相关双采样 (CDS).
- 引入噪声带宽 (NBW) 系数以估计有效的NBW,考虑到坡道斜率的短暂影响.
主要成果:
- 在3.24μm像素内实现了低随机噪声 (RN) 水平2.2电子根-平均-平方 (e-rms).
- 识别了闪噪声 (FN) 作为设计的小像素 DPS 中的主导噪声贡献者.
- 证明在研究条件下,限制噪声带宽 (NBW) 或使用数字相关双采样 (D-CDS) 提供了有限的进一步RN改进.
结论:
- 建议的低RNSS-ADC设计对小像素DPS应用有效.
- 在面积有限的DPS设计中,闪噪声 (FN) 是一个主要问题,需要具体的缓解策略.
- 该研究为在先进的像素设计中进行噪声分析和优化提供了一个框架.
关键词:
这是一个CMOS图像传感器.相关联的双重抽样.数字像素传感器是一个数字像素传感器.闪的噪音 闪的噪音像素平行的ADC是一个平行的ADC.随机噪音 随机噪音是一种随机的噪音.这是一条单斜坡的单斜坡.更多相关视频
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