流水线ADC组合误差分析与辨识模型设计  

Design of a Pipeline ADC Combination Error Analysis and Identification Model

作　　者：彭隽[1,2] 马洪[1,2] 胡啸[1,2] 彭亮[1,2] 

机构地区：[1]华中科技大学电子与信息工程系,湖北武汉430074 [2]武汉光电国家实验室(筹),湖北武汉430074

出　　处：《计算机工程与科学》2011年第4期173-179,共7页Computer Engineering & Science

基　　金：国家自然科学基金2009年面上项目(10975056);武汉光电国家实验室(筹)2008年创新基金(Z080005)

摘　　要：本文详细研究了影响流水线ADC动态性能的主要误差来源及其不同组合和耦合方式的影响结果与权重,获得了流水线拼接输出数字码中的杂谐波分量与组合误差之间的对应关系。在此基础上,设计了用于表征流水线ADC非线性特性的分立式维纳模型。对14位三级流水的AD6645芯片进行测试,结果表明流水线ADC器件的实际输入输出特征与该辨识模型的性质吻合。得到的误差分析结论与经过检验的模型结构可为数字后补偿方法中非线性逆模型的选取提供参考依据。Taking into account the mutual influence and coupling of different error sources in Pipeline ADC（Analog to Digital Converter）,this paper detailedly analyzes the effect and weight of the dominant errors and their combinations on the overall accuracy.The relationship between spurs or harmonics and the combination errors is precisely confirmed.Based on that,an accurate parallel Wiener model for describing the Pipeline ADC nonlinearity is designed.Measurements on a 14-bits Pipeline ADC with three stages indicate that the actual input-output characteristics of the system have the symmetric properties of the identification model.The selection of nonlinear inverse models in digital post-calibration techniques will benefit much from the error analysis conclusions and the confirmed representation model proposed in the paper.

关 键 词：流水线ADC 组合误差 辨识模型 

分 类 号：TN792[电子电信—电路与系统]