New Models for the Calibration of Four-Channel Time-Interleaved ADCs Using Filter Banks
New Models for the Calibration of Four-Channel Time-Interleaved ADCs Using Filter Banks
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DOI：
10.1109/tcsii.2017.2662084
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
P. Monsurrò;Felice Rosato;A. Trifiletti
中科院分区：
文献类型：
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作者：
P. Monsurrò;Felice Rosato;A. Trifiletti
提出并研究了一种新的线性模型来校准四通道时间交错模数转换器。消除失真的理想四周期校正滤波器是根据误差滤波器计算的，误差滤波器模拟每个通道的模拟传递函数，包括采样时间。这些校正滤波器，然后近似为一个线性组合的基础过滤器和新的准确的模型，提出了一个有限数量的自由参数。使用递归最小二乘算法进行校准，以估计线性组合的系数（和偏移项）。由此产生的算法进行测试的精度，收敛速度和稳定性，在一个固定的点实现，并与以前发表的线性背景校准技术进行比较。所提出的滤波器组显着提高了精度/复杂性的权衡与以前公布的技术。
New linear models to calibrate four-channel time-interleaved analog-to-digital converters are proposed and investigated. The ideal four-periodic correction filters, which cancel distortions, are computed as a function of the error filters that model the analog transfer function of each channel, including the sampling time. These correction filters are then approximated as a linear combination of base filters and new accurate models with a limited number of free parameters are proposed. Calibration is performed using the recursive least squares algorithm to estimate the coefficients of the linear combination (and the offset term). The resulting algorithms are tested for accuracy, convergence speed, and stability in a fixed-point implementation, and are compared with previously published linear background calibration techniques. The proposed filter bank significantly improves the accuracy/complexity tradeoff with respect to previously published techniques.