一种时间交织ADC采样时间误差校正方法  

A Sampling Time Mismatch Calibration Algorithm for Time-Interleaved ADC

作　　者：曹宇 苗澎[1] 黎飞[1] 王欢 CAO Yu;MIAO Peng;LI Fei;WANG Huan(School of Information Science and Engineering,Southeast University,Nanjing 211100,P.R.China)

机构地区：[1]东南大学信息科学与工程学院,南京211100

出　　处：《微电子学》2020年第5期669-674,共6页Microelectronics

基　　金：国家重点研发计划项目(2018YFB2003302)。

摘　　要：提出了一种用于时间交织模数转换器(TIADC)通道间采样时间误差的校正算法。该算法是基于参考通道的后台校正算法。通过比较参考通道与带校准通道的输出差异提取出采样误差信息,并通过负反馈逻辑进行校准。该算法的校正模块硬件消耗低,可支持包括完全随机输入信号的多种类型输入信号。将该校正算法应用于一个4 GHz、8 bit四通道TIADC,后仿真结果表明,当输入信号接近奈奎斯特频率、存在其他非理想因素的条件下,该算法能将通道间采样时间误差相关的频谱尖峰抑制到35 dB。A sampling time mismatch calibration algorithm for time-interleaved analog-to-digital converter(TIADC)was proposed.It was a background calibration method based on reference channel.By comparing different values between the reference channel and the channel to be calibration,the algorithm could extract the mismatch-related errors and correct them with the negative feedback.The correction module of the algorithm had low hardware consumption and could support many types of input signals,including completely random input signals.The forward algorithm was applied to a 4 GHz,8 bit,4-channel TIADC.The simulation results showed that the algorithm could suppress the spectrum peak related to the sampling time error between channels to 35 dB when the input signal was close to Nyquist frequency and other non-ideal factors existed.

关 键 词：采样时间误差 后台校正 参考通道 

分 类 号：TN792[电子电信—电路与系统]