Dither信号理论分析及仿真  

Analysis and Simulation of Dither Signals

作　　者：陈静[1,2] 侯媛彬[2] 

机构地区：[1]西安建筑科技大学,西安710055 [2]西安科技大学,西安710054

出　　处：《电光与控制》2009年第12期46-47,57,共3页Electronics Optics & Control

摘　　要：模拟数字转化器(ADC)具有典型的非线性特性,其输出噪声对输入信号存在着依赖关系。为了降低ADC的非线性,对减性Dither量化器控制系统进行了数学分析,得出了使量化器输出噪声与输入信号无关所需要满足的充分必要条件。并利用LabVIEW搭建了减性Dither量化器控制系统数字仿真平台,对系统分别加入宽带白噪声Dither信号和窄带正弦Dither信号,仿真结果表明适当地选取Dither信号将有效地改善ADC的性能。The Analog-to-Digital Converter （ADC） has a typical nonlinear feature and its output noise relies on the input signal. To decrease the nonlinearity, we made mathematical analysis to Dither quantizer control system, and obtained the necessary and sufficient condition for making the output noise independent of the input signal. LabVIEW was used to complete simulation by adding different Dither signals on the system, including broadband white noise Dither signal and narrow band Sine Dither signal. Simulation result showed that the performance of ADC can be improved effectively by choosing the right Dither signal.

关 键 词：Dither信号 频谱分析 ADC SFDR 

分 类 号：V271.4[航空宇航科学与技术—飞行器设计] TN79[电子电信—电路与系统]