一种TIADC系统误差自适应联合补偿算法  

Joint adaptive algorithm for compensation of channel-mismatches in TIADC

作　　者：王克[1] 樊昌周[1] 李宏伟[1] 梁丹亚[1] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《重庆邮电大学学报（自然科学版）》2016年第3期325-329,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：陕西省自然科学基础研究计划项目(2013JQ8027)~~

摘　　要：针对时间交替并行采样系统(time-interleaved analog-to-digital converter,TIADC)通道间存在直流偏置误差、增益误差和时钟失配误差的问题,提出一种基于自适应的误差联合补偿算法。该算法设计了新的系统时序和基于子通道的误差补偿模型,采用多输入的自适应结构,实现对3种误差的联合补偿。理论分析和仿真结果表明,新算法结构简单,运算量小,具有良好的抗噪声性能,同时算法对带通信号有良好的适用性。当ADC量化位数为16时,系统的信纳比能够提升约37 d B,无杂散动态范围能够提升约50 d B。In order to solve the problem of the offset, gain and timing-skew among the channels of time-interleaved analog- to-digital converter （TIADC） , an adaptive method is proposed. The algorithm designs a ne＊w time sequence and a calibra-tion model based on sub-channel using the multi-input adaptive structure and realizing joint calibration for the three errors.Through the theoretical analysis and simulation results show that the ne＊w algorithm has simple structure , small computationand good anti-noise performance. Moreover , the algorithm has good applicability for band-pass signal , when the ADCs out-puts are quantized to 16 bits , the SNDR of the output can be raised around 37 dB , and the SFDR of the output can be raised around 50 dB.

关 键 词：时间交替并行采样系统(TIADC) 自适应补偿 泰勒级数 时钟失配 增益误差 

分 类 号：TN957[电子电信—信号与信息处理]