Dithering对ADC量化误差影响的分析研究  

Analysis and Research of Dithering Effects on ADC Quantization Noise

作　　者：刘欣[1] 熊兴中[1] 杨平先[1] 

机构地区：[1]四川理工学院人工智能四川省重点实验室,四川自贡643000

出　　处：《电视技术》2014年第13期121-125,共5页Video Engineering

基　　金：四川省省属高校科研创新团队建设计划基金项目(13TD0017);人工智能四川省重点实验室基金资助项目(2012RYJ05);人工智能四川省重点实验室基金资助项目(2011RZY01)

摘　　要：针对模数转换器ADC中抖动Dithering对量化噪声的影响问题,对3种典型分布的抖动信号进行了理论分析研究,并通过系统模型直接验证输出波形。理论分析及实验结果表明只要加入的Dithering信号能够降低量化噪声对输入信号的依赖关系,并且Dithering信号的特征函数在一定条件下能够为零,则Dithering信号就能有效地改善ADC的非线性特性,在一定程度上减少量化噪声对系统性能的影响,其中均匀分布的Dithering信号可以明显改善ADC的性能,从而也印证了上述分析和结论。According to the dithering effects on the quantization noise in Analog-to-Digital Conversion （ADC）, three kind of typical distribution of dithering theoretically are analyzed and researched, and the output waveform of ADC in simulation model is verified directly. Theoretical analysis and ex- perimental results indicate that the dithering can improve the nonlinear characteristics of ADC effectively, and reduce the effect on quantization noise per- formance to some extent, if the dithering can weaken the reliant relationship between the quantization noise and the input signals, moreover, the charac- teristic function of dithering equal to zero under certain conditions. The dithering which is the uniform distribution can improve the performance of the ADC distinctly confirmed the analysis and experimental.

关 键 词：模数转换器 非线性特性 抖动信号 量化噪声 均匀分布 

分 类 号：TN79[电子电信—电路与系统]