Blind Correction of Gain and Timing Mismatches for a Two-Channel Time-Interleaved Analog-to-Digital Converter

A time-interleaved analog-to-digital converter (TIADC) structurally provides faster data conversion, but its spectral performance is limited by gain and timing mismatches between sub-converters. In this paper, we propose a novel blind method for TIADC mismatch correction. Assuming a wide-sense stationary (WSS) input, we adjust the reconstruction system until the entire system restores shift-invariance, yielding a WSS output. We also prove that this input-output WSS condition is sufficient as well as necessary for a two-channel TIADC mismatch correction. Supportive simulation results are included. The proposed method can be used for online calibration of a TIADC without interruption or any dedicated signal.

[1]  Yonina C. Eldar,et al.  Filterbank reconstruction of bandlimited signals from nonuniform and generalized samples , 2000, IEEE Trans. Signal Process..

[2]  Gregory W. Wornell,et al.  Signal recovery in time-interleaved analog-to-digital converters , 2004, 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[3]  William A. Gardner,et al.  Introduction to random processes with applications to signals and systems: Reviewer: D. W. Clarke Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PK, England , 1988, Autom..

[4]  P. Vaidyanathan.  Multirate Systems And Filter Banks , 1992 .

[5]  Fredrik Gustafsson,et al.  Blind equalization of time errors in a time-interleaved ADC system , 2005, IEEE Transactions on Signal Processing.

[6]  Hideaki Sakai,et al.  Optimization of filter banks using cyclostationary spectral analysis , 1996, IEEE Trans. Signal Process..

[7]  Fredrik Gustafsson,et al.  Blind adaptive equalization of mismatch errors in a time-interleaved A/D converter system , 2004, IEEE Transactions on Circuits and Systems I: Regular Papers.

[8]  W. Black,et al.  Time interleaved converter arrays , 1980, 1980 IEEE International Solid-State Circuits Conference. Digest of Technical Papers.

[9]  Stephen H. Lewis,et al.  Calibration of sample-time error in a two-channel time-interleaved analog-to-digital converter , 2004, IEEE Transactions on Circuits and Systems I: Regular Papers.

[10]  U. Madhow,et al.  Comprehensive digital correction of mismatch errors for a 400-msamples/s 80-dB SFDR time-interleaved analog-to-digital converter , 2005, IEEE Transactions on Microwave Theory and Techniques.