METHOD AND APPARATUS FOR PROVIDING DIGITAL BACKGROUND CALIBRATION FOR MISMATCHES IN M-CHANNEL TIME-INTERLEVED ADCS (TI-ADCS)

摘要

The present invention relates to a method and apparatus for providing digital background calibration for mismatches in M-channel time-interleaved ADCs(TI-ADCs), more specifically providing a pure digital blind calibration technique for offset mismatch, gain mismatch and time mismatch, which are essentially incurred by utilizing a time-interleaved analog-digital converter in systems having to process data with high speeds. Wherein the offset mismatch and gain mismatch are corrected based on statistical characteristics of the digital signals which are sampled and outputted in channel by channel, and the time mismatch is corrected based on a derivative filter and a delay filter. Thereby the present invention relating to a method and apparatus for digital background calibration enables the hardware complexity to be reduced and the efficiency of hardware resource to be increased. The pure digital background calibration of mismatches base on addition, subtraction and multiplication operations is also independent of foundaries and processes, and significantly reduces the design complexity.