频率交织ADC系统中的误差研究  

Research on the Errors in Frequency-Interleaved ADC System

作　　者：刘涛[1] 田书林[1] 叶笠 郭连平[1] LIU Tao;TIAN Shu-lin;YE Li;GUO Lian-ping(School of Automation Engineering,University of Electronic Science and Technology of China,Chengdu 611731;Troops No.78179,Chengdu 611100)

机构地区：[1]电子科技大学自动化工程学院,成都611731 [2]78179部队,成都611100

出　　处：《电子科技大学学报》2019年第5期734-740,共7页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(61701077,61671114)

摘　　要：由偏置误差、增益误差、时间误差组成的通道失配误差和模拟实现误差是频率交织模数转换器(ADC)系统的两类主要误差源,会对系统全局性能产生恶化影响。该文针对频率交织ADC系统的误差进行了深入研究,研究结果表明引起实现误差的采样滤波器实际工作的频率响应是数学可测的,通道失配误差会造成输出信号频谱有规律地出现杂散尖峰。理论推导和仿真验证均证实增益误差和时间误差引起的输出杂散频率位置相同但相位有差异,而偏置误差引起的尖峰幅值则与输入频率无关,这对开展误差补偿及校准工作具有支撑作用。Analog realization error and channel mismatch error comprised of offset error,gain error and time error are the two key kinds of error sources in frequency interleaved analog to digital converter (ADC) systems, resulting in the systems’ global performance degeneration.In this paper,intensive study is carried out on the errors in frequency interleaved ADC systems.On the one hand,it shows that the virtual frequency response of the sampling filter leading to the realization error is mathematically calculable.On the other hand,it also reveals that the channel mismatch error will give birth to the regular appearance of the spurious noise peaks in the spectrum of the output signal.Both the theoretical derivation and simulation verification certify that the spurious noises caused by the gain error and the time error occur at the same frequency location but not that of phase,and the peak amplitude caused by the offset error has nothing to do with the input signal frequency.The research results will promote the development of error compensation and calibration.

关 键 词：通道失配误差 频率交织模数转换器 实现误差 杂散尖峰 时间交织ADC 

分 类 号：TN911[电子电信—通信与信息系统]