基于松弛法的TIADC综合误差的自适应估计与校准  

Adaptive Estimation and Calibration of TIADC Synthesis Errors Based on Relaxation Method

作　　者：李雪涛 罗向东[1] LI Xuetao;LUO Xiangdong(School of Information Science and Technology,Nantong University,Nantong Jiangsu 226019,China)

机构地区：[1]南通大学信息科学技术学院,江苏南通226019

出　　处：《电子器件》2023年第5期1174-1179,共6页Chinese Journal of Electron Devices

基　　金：国家自然科学基金重大科研仪器研制项目(61927806)。

摘　　要：TIADC系统中各通道所存在的增益、偏置与时间失配误差将严重影响整个TIADC系统的性能,同时这种影响会随着系统分辨率的提高导致系统的信噪比降至更低,从而使有效位数急剧下降。提出了一种基于松弛法的自适应算法实现对高精度(18 bit以上)TIADC系统的各项失配误差同时自适应跟踪估计,并使用分数延时滤波器针对时间失配误差进行校准。实验仿真结果表明,该算法将TIADC系统的信噪比提高到96.73 dB,无杂散动态范围提升到97.31 dB,校准效果较为理想,且可应用于24 bit TIADC系统,在高分辨率TIADC系统的误差估计与校准研究中具有一定的意义。The gain,offset and time errors in TIADC system will affect the performance of the whole system.Meanwhile,this impact will reduce the signal-to-noise ratio of the system to a lower level with the improvement of system resolution,resulting in a sharp decline in the effective bits.An adaptive algorithm based on relaxation method is proposed to realize the simultaneous adaptive tracking and estimation of each error of high-precision(more than 18 bit)TIADC channels,and the fractional delay filter is used to calibrate the time error.The experimental simulation results show that the algorithm improves the signal-to-noise ratio of TIADC system to 96.73 dB and the spurious free dynamic range to 97.31 dB.The correction effect is ideal,and can be applied to 24 bit TIADC system.It has a significant value in the research of error and correction of high-resolution TIADC system.

关 键 词：TIADC 通道失配 误差估计 松弛 自适应 

分 类 号：TN792[电子电信—电路与系统]