时间交叉模数转换器采样时间误差的补偿算法  

Novel method for compensation of timing mismatch in time-interleaved ADC

作　　者：王亚军[1] 李明[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2012年第2期101-107,共7页Journal of Xidian University

基　　金：国家自然科学基金资助项目(60872137);国家部委预研基金资助项目(9140C0103071003);航空科学基金资助项目(20080181002)

摘　　要：针对时间交叉采样模数转换器中存在的采样时间误差,提出了一种新的全数字域补偿算法.该算法根据误差产生的原理,采用可变数字分数延时器对误差进行了补偿,得到了较好的效果.与其他已有算法相比,新算法概念简单,结构易于实现,容易进行通道扩展,通道越多,资源优势越明显.另外,算法采用Farrow结构分离了误差参数,很容易和参数估计算法一起组成自适应系统.仿真结果表明,在小误差范围内,新算法使时间交叉采样数模转换器系统的信纳比提高了30dB以上.此外,该算法对输入中的加性噪声不敏感,具有比较好的适应性.A novel method to compensate the timing mismatch in time-interleaved ADCs（TIADC） in the digital domain is presented.Based on the principle of timing mismatch,the variable digital fractional delay element is used to compensate the mismatch in the new method,and a good performance is achieved.Compared with existing algorithms,this new method is very easy in conception and has major advantages from an implementation point of view.It is simple and efficient to implement and extend.A farrow structure is adopted to separate error parameters,so this method could easily be combined with the estimation method to build an adaptive system.Simulation results indicate that the proposed method can lead to an improvement of more than 30 dB in the signal-to-noise-and-distortion ratio（SINAD） of TIADC.And the new method is not sensitive to additive noise of input.

关 键 词：补偿算法 时间交叉采样模数变换器 数字分数延时器 采样时间误差 

分 类 号：TN911.5[电子电信—通信与信息系统]