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设计了一种适用于TIADC的高精度时间失配误差校准算法。基于相邻通道信号互相关原理,对相邻通道的输出信号作相关运算来估计时间失配误差,再利用基于泰勒级数展开的高阶误差校准方法进行误差校正。误差估计模块与校准模块构成一个反馈环路,可以实现误差的实时跟踪和校正。校准算法行为级仿真结果表明,在12位1GHz四通道的TIADC中,当输入信号归一化频率fin/fs=0.477 1时,校准后系统的ENOB提高到11.85位,SNR提高了43dB以上,校准效果明显。相比已有的校准算法,该校准算法具有更高的校准精度,不受通道数的限制,结构更简单,且在整个奈奎斯特频率范围内都适用,非常适合工程应用。
A high precision time mismatch error calibration algorithm for TIADC is designed. Based on the principle of cross-correlation of adjacent channel signals, the output signals of adjacent channels are correlated to estimate the time mismatch error, and then the error correction is performed using the high-order error calibration method based on Taylor series expansion. The error estimation module and the calibration module form a feedback loop, which can realize real-time tracking and correction of the error. Calibration Algorithm The behavioral simulation results show that when the normalized frequency of the input signal fin / fs = 0.477 1, the ENOB of the calibrated system is increased to 11.85 bits and the SNR is improved by more than 43 dB in a 12-bit, 1 GHz, four-channel TIADC. Calibration The effect is obvious. Compared with the existing calibration algorithms, this calibration algorithm has higher calibration accuracy, is not limited by the number of channels, has a simpler structure and is suitable for the entire Nyquist frequency range, and is therefore very suitable for engineering applications.