周燕敏, 秦会斌, 胡永才. 一种CMOS图像传感器像素复位电路[J]. 微电子学与计算机, 2016, 33(3): 103-106, 110.
引用本文: 周燕敏, 秦会斌, 胡永才. 一种CMOS图像传感器像素复位电路[J]. 微电子学与计算机, 2016, 33(3): 103-106, 110.
ZHOU Yan-min, QIN Hui-bin, HU Yong-cai. A Kind of CMOS Image Sensor Pixel Reset Circuit[J]. Microelectronics & Computer, 2016, 33(3): 103-106, 110.
Citation: ZHOU Yan-min, QIN Hui-bin, HU Yong-cai. A Kind of CMOS Image Sensor Pixel Reset Circuit[J]. Microelectronics & Computer, 2016, 33(3): 103-106, 110.

一种CMOS图像传感器像素复位电路

A Kind of CMOS Image Sensor Pixel Reset Circuit

  • 摘要: CMOS图像传感器中像素复位方式直接影响图像的成像质量.以双斜率积分和软硬件结合的复位方式为基础, 对现有的复位电路进行仿真、分析, 发现现有复位电路存在的缺陷, 针对这些缺陷, 提出了一种高动态范围、抑制图像拖尾的COMS像素复位电路.双斜率积分的长、短积分复位分别采用复位管漏极电压过零复位和软硬件结合的复位方式来抑制图像拖尾.复位管采用衬底独立结构, 避免弱光下, 短积分复位时刻浮置扩散区电压受影响.经过验证, 该复位电路能有效地抑制图像拖尾, 扩展动态范围.

     

    Abstract: The reset method of the CMOS image sensor pixels directly affect the image quality.Through analying and simulating of the existing reset circuit, we found the existing flaws of them.This article proposed a high dynamic range, inhibition of image lag reset circuit based on Dual-slope integration, aimming to fix those flaws.In this reset circuit, we zeroed the drain voltage of the reset tube and used thecombination of hardware and software reset method respectively during the long-time and short-time integral reset period to restrain the image lag.The simulation verificated that the reset circuit does restrained image trailing and extended the dynamic range effectively.

     

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