混合域实现图像块矩阵变换的CIS像素读出噪声分析
Pixel readout noise analysis of the CMOS image sensor with mixed-signal realizing block-matrix transform
姚素英 1王龙菲 1孙权 1徐江涛1
作者信息
- 1. 天津大学电子信息工程学院,天津300072
- 折叠
摘要
为了研究双存储像素的读出噪声对混合域实现图像块矩阵变换的CMOS图像传感器(CIS)产生的误差影响,对其进行噪声分析.结合双存储像素的工作时序,对实现图像块矩阵变换过程中由于多次采样和双路存储而增加的kTC噪声、源跟随器的l/f噪声和热噪声进行分析并建立数学模型,总结出双存储像素读出噪声对一次块矩阵变换的误差影响.以二维离散余弦变换为例,通过CHRT 0.35μm标准CMOS工艺电路仿真并结合matlab/simulink对比验证,得出增大存储电容、减小源跟随器宽长比可以降低由于像素读出噪声引起的误差.结果证明,此方法可以有效降低噪声,指导电路设计.
Abstract
In order to study the error caused by the dual-pixel's readout noise in the CMOS Image Sensor with mixed-signal realizing block-matrix transform,the noise analysis is presented.With the timing of the dual-pixel,the mathematical model of kTC noise,source follower's l/f noise and thermal noise caused by multiple sampling and two signal paths storage is established and the formula of the error caused by the dual-pixel's readout noise in one block-matrix transform is presented.Testing by circuit simulation with the CHRT 0.35μm standard CMOS process and comparing with Matlab/Simulink verification in two dimension discrete cosine transform (2D-DCT),it is found that increasing the storage capacitor and reducing the W/L of source follower can reduce the error caused by the pixel readout noise.The results show that this method can effectively reduce pixel noise,guidance circuit design.
关键词
CMOS图像传感器/块矩阵变换/双存储像素/噪声/混合信号处理Key words
CMOS image sensor/block-matrix transform/dual-pixel/noise/mixed-signal processing引用本文复制引用
基金项目
国家自然科学基金(61076024)
国家自然科学基金(61036004)
教育部高等学校博士学科点专项科研基金(20100032110031)
出版年
2013
NETL
NSTL
维普
万方数据