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首页> 外文期刊>IEEE sensors journal >Transient Response and Fixed Pattern Noise in Logarithmic CMOS Image Sensors
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Transient Response and Fixed Pattern Noise in Logarithmic CMOS Image Sensors

机译:对数CMOS图像传感器中的瞬态响应和固定模式噪声

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摘要

Logarithmic CMOS image sensors are appealing for their high-contrast and high-speed response but they require postprocessing to achieve high-quality images. Previously published work has explained the fixed pattern noise (FPN) in these image sensors using a steady-state analysis. This paper explains how the transient response of the readout circuit may also contribute to FPN. Thus, the performance of these CMOS cameras may be optimized with a proper understanding of the transient response, which is explained here through modeling and simulation with some experimental validation. In particular, the gain variation of a logarithmic camera is shown to be caused primarily by premature digitization. As logarithmic and linear active pixel sensors use similar circuits, some results in this paper, e.g., an analysis of readout capacitance, apply equally to the latter.
机译:对数CMOS图像传感器以其高对比度和高速响应而吸引人,但它们需要后处理才能获得高质量的图像。先前发表的工作已使用稳态分析解释了这些图像传感器中的固定模式噪声(FPN)。本文解释了读出电路的瞬态响应如何也可能对FPN产生影响。因此,可以通过适当地理解瞬态响应来优化这些CMOS相机的性能,在此通过建模和仿真以及一些实验验证来说明这一点。特别是,对数摄像机的增益变化显示出主要是由过早的数字化引起的。由于对数和线性有源像素传感器使用类似的电路,因此本文中的一些结果(例如读出电容的分析)同样适用于后者。

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