Abstract:

A novel method for identification and compensation of the timing-skew in time-interleaved analog-to-digital converter (TIADC) in digital domain is presented. In this method, the relationship between the spectrums of original input and error signals is used to establish an estimation-model based on least-mean-square (LMS). Compared with the existing methods, the new method has major advantages from an implementation point of view, and can converge rapidly. According to the principle of timing-skew, the compensation method based on digital fractional delay element is designed with the advantages of simple conception and resource economy. By using Farrow structure, the error parameters are extracted, and it is very convenient to build an adaptive system with the  estimation-model. The simulation results show that the proposed method can converge after about 5 000 samples and the compensated output can get an improvement of at least 30 dB in signal-to-noise-and-distortion ratio (SINAD).