摘要
采样时间偏移误差校正一直是时分交替ADC各通道间失配校正的难点。传统的盲校正方式因采用自身信号作为参考信号,会在某些情况下出现校正出错的情形。在分数阶延时滤波器的基础上,通过在模拟信号中预留一定带宽给校正信号及其失真信息来实现采样时间误差的半盲校正,克服盲校正算法中出现校正出错的情形,并且采用变步长算法,实现了收敛速度和稳态误差的优化,最后给出相应的仿真结果。该算法为时分交替ADC的校正提供了一种新的思路。
Calibration of time skew error is always the key point of different calibration types in time-interleaved ADC system. The traditional blind calibration algorithm, which uses sampled signal as reference, cannot calibrate time skew error in certain situations. A semi-blind algorithm was proposed to calibrate time skew error by assigning an unused spectrum to calibration signal and its distortion information, and solve the problem of wrong calibration in blind calibration method based on fractional delay filter. A variable step algorithm was also adopted to achieve a quick convergence and smaller static error. Simulation results were presented to validate the proposed algorithm, which provides a new way for time skew calibration of time-interleaved ADC system.
出处
《微电子学》
CAS
CSCD
北大核心
2013年第5期704-707,712,共5页
Microelectronics
关键词
时分交替ADC
采样时间误差
半盲校正
变步长
Time-interleaved ADC
Time skew error
Semi-blind calibration
Variable step
