CMOS图像传感器中分段电容DAC非理想因素研究 |
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引用本文: | 孙权,姚素英,徐文静,聂凯明,徐江涛.CMOS图像传感器中分段电容DAC非理想因素研究[J].传感技术学报,2014,27(1). |
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作者姓名: | 孙权 姚素英 徐文静 聂凯明 徐江涛 |
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作者单位: | 天津大学电子信息工程学院; |
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基金项目: | National Natural Science Foundation of China(61036004) |
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摘 要: | CMOS图像传感器信号处理中通常采用分段电容DAC产生斜坡参考电压。研究了分段电容DAC精确的电容失配及寄生与其转换精度的关系式。基于对分段电容DAC工作原理的研究,导出了电容失配及寄生模型;针对其分数桥接电容失配、各二进制电容间的失配及寄生电容问题进行了理论分析;对分段电容DAC进行非理想因素仿真,设计了一个采用分段电容DAC的10位单斜ADC并对其进行测试,仿真和测试结果均验证了理论分析的正确性。上述理论分析结果可作为分段电容DAC的设计指导。
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关 键 词: | 微电子学与固体电子学 分段电容DAC 电容失配 寄生 转换精度 |
Research on Non-Ideal Factors of Segmented-Capacitor DAC in CMOS Image Sensor |
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Abstract: | segmented-capacitor digital analog converter (SC DAC) is usually used in CMOS image sensor to generate a ramp reference voltage. Precise relationships between conversion resolution and non-ideal factors segmented-capacitor digital analog converter are derived. These non-ideal factors consist of coupling capacitor mismatch, binary-weighted-capacitor mismatch and parasitic effects. Initially, based on the study of SC DAC operation principle, mathematical models are established. Then the effects of non-ideal factors on SC DAC are analyzed. Simulation and measurement results verify the theoretical analysis. These precise relationships serve as a guideline for the design of SC DAC. |
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Keywords: | microelectronics and solid electronics segmented-capacitor DAC capacitor mismatch parasitic conversion resolution |
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