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Current-Mode CMOS Imaging Sensor With Velocity Saturation Mode of Operation and Feedback Mechanism

机译:具有速度饱和操作模式和反馈机制的电流模式CMOS成像传感器

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摘要

We present a complementary metal–oxide–semiconductor (CMOS) imaging sensor containing two novelties in the field of current mode sensing. First, the in-pixel read-out transistor operates in velocity saturation mode and allows for high linearity between integrated photo charges and output current of the pixel. Second, the column parallel read-out circuitry includes a novel current conveyor with a feedback mechanism, which improves linearity of the output current and leads to improvements in fixed pattern noise. Correlated double sampling, a noise reduction technique, is performed on-chip via current mode circuits to improve spatial noise characteristics of the imager. A prototype of the proposed imaging sensor was fabricated in 0.18 $mu{rm m}$ triple well CMOS process. The sensor operation and measurements are presented.
机译:我们提出了一种互补的金属氧化物半导体(CMOS)成像传感器,该传感器在电流模式传感领域具有两个新颖之处。首先,像素内读出晶体管以速度饱和模式工作,并且允许积分的光电荷与像素的输出电流之间的高线性。其次,列并行读出电路包括具有反馈机制的新型电流传送器,该电流传送器改善了输出电流的线性并导致固定模式噪声的改善。通过电流模式电路在芯片上执行相关的双重采样(一种降噪技术),以改善成像器的空间噪声特性。所提出的成像传感器的原型是在0.18μm的三阱CMOS工艺中制造的。介绍了传感器的操作和测量。

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