北京工业大学电子信息与控制工程学院,北京,100124
纸质出版:2015
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刘素娟, 齐佩佩, 姜文姝, 等. 基于频域特性的时间交替模数转换系统采样时间误差校正算法[J]. 电子学报, 2015,43(3):587-590.
LIU Su-juan, QI Pei-pei, JIANG Wen-shu, et al. A Timing Mismatch Calibration Method for Time-Interleaved ADC Based on Spectral Characteristics[J]. Acta Electronica Sinica, 2015, 43(3): 587-590.
刘素娟, 齐佩佩, 姜文姝, 等. 基于频域特性的时间交替模数转换系统采样时间误差校正算法[J]. 电子学报, 2015,43(3):587-590. DOI: 10.3969/j.issn.0372-2112.2015.03.025.
LIU Su-juan, QI Pei-pei, JIANG Wen-shu, et al. A Timing Mismatch Calibration Method for Time-Interleaved ADC Based on Spectral Characteristics[J]. Acta Electronica Sinica, 2015, 43(3): 587-590. DOI: 10.3969/j.issn.0372-2112.2015.03.025.
时间交替模数转换器(Time-Interleaved ADC
TIADC)通道间的采样时间相对误差严重影响了系统的无杂散动态范围(Spurious-Free Dynamic Range
SFDR).为校正采样时间相对误差
本文基于TIADC输出与模拟输入信号之间的频域关系
提出一种通过消除输出信号中的误差来校准TIADC的算法.该算法在对输出信号频率表达式进行泰勒近似的基础上构建理想输出信号
并采用最小均方差(LMS)算法来估算时间误差
旨在降低硬件设计的复杂度
提高误差校正的精确度.仿真和验证结果表明该校正算法很容易扩展到多通道
并且可以将输出频谱的SFDR提高约47dB.
Timing mismatches in time-interleaved ADCs (TIADC) greatly degrade the spurious-free dynamic range (SFDR) of this system.For calibrating timing mismatches
based on the spectra relation between the analog input signal and the output signal of the TIADC system
a blind timing mismatch calibration algorithm is proposed by eliminating the error signal in the output signal.By expanding the frequency expression of output signal in Taylor approximation
this algorithm can construct the ideal output signal.By introducing least mean square (LMS) for estimating timing mismatch
this proposed algorithm is aimed at reducing the complexity of hardware and improving the accuracy of calibration algorithms.Experiments show that this algorithm can easily extend to an arbitrary number of channels and improve the SFDR of the output signal about 47dB.
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