Time-interleaved analog-to-digital converters: status and future directions

We discuss time-interleaved analog-to-digital converters (ADCs) as a prime example of merging analog and digital signal processing. A time-interleaved ADC (TI-ADC) consists of M parallel channel ADCs that alternately take samples from the input signal, where the sampling rate can be increased by the number of channels compared to a single channel. We recall the advantages of time interleaving and investigate the problems involved. In particular, we explain the error behavior of mismatches among the channels, which distort the output signal and reduce the system performance significantly, and provide a concise framework for dealing with them. Based on this analysis, we review the principle possibilities of calibrating TI-ADCs, where we point out the necessities and advantages of digital enhancement. To this end, we discuss open issues of channel mismatch identification as well as channel mismatch correction

[1]  Huawen Jin,et al.  A digital-background calibration technique for minimizing timing-error effects in time-interleaved ADCs , 2000 .

[2]  A. Montijo,et al.  A 20 GS/s 8 b ADC with a 1 MB memory in 0.18 /spl mu/m CMOS , 2003, 2003 IEEE International Solid-State Circuits Conference, 2003. Digest of Technical Papers. ISSCC..

[3]  Yih-Chyun Jenq.  Perfect reconstruction of digital spectrum from nonuniformly sampled signals , 1997 .

[4]  Christian Vogel,et al.  The impact of combined channel mismatch effects in time-interleaved ADCs , 2005, IEEE Transactions on Instrumentation and Measurement.

[5]  Lars Wanhammar,et al.  Two-channel digital and hybrid analog/digital multirate filter banks with very low-complexity analysis or synthesis filters , 2003, IEEE Trans. Circuits Syst. II Express Briefs.

[6]  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.

[7]  Truong Q. Nguyen,et al.  Design of hybrid filter banks for analog/digital conversion , 1998, IEEE Trans. Signal Process..

[8]  Håkan Johansson,et al.  Reconstruction of nonuniformly sampled bandlimited signals by means of digital fractional delay filters , 2002, IEEE Trans. Signal Process..

[9]  Measurement , 2007 .

[10]  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.

[11]  D. Munson.  Circuits and systems , 1982, Proceedings of the IEEE.

[12]  P. Hurst,et al.  A digital background calibration technique for time-interleaved analog-to-digital converters , 1998, IEEE J. Solid State Circuits.

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

[14]  Gernot Kubin,et al.  Modeling of time-interleaved ADCs with nonlinear hybrid filter banks , 2005 .

[15]  Yih-Chyun Jenq,et al.  Digital spectra of nonuniformly sampled signals: a robust sampling time offset estimation algorithm for ultra high-speed waveform digitizers using interleaving , 1990 .

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

[17]  Bernard C. Levy,et al.  Reconstruction of band-limited periodic nonuniformly sampled signals through multirate filter banks , 2004, IEEE Transactions on Circuits and Systems I: Regular Papers.

[18]  A. Papoulis,et al.  Generalized sampling expansion , 1977 .

[19]  Boris Murmann,et al.  Digitally Assisted Pipeline ADCs: Theory and Implementation , 2004 .

[20]  Franco Maloberti,et al.  Gain and offset mismatch calibration in time-interleaved multipath A/D sigma-delta modulators , 2004, IEEE Transactions on Circuits and Systems I: Regular Papers.

[21]  D. Draxelmayr,et al.  A 6b 600MHz 10mW ADC array in digital 90nm CMOS , 2004, 2004 IEEE International Solid-State Circuits Conference (IEEE Cat. No.04CH37519).

[22]  J. M. Dias Pereira,et al.  An FFT-based method to evaluate and compensate gain and offset errors of interleaved ADC systems , 2004, IEEE Transactions on Instrumentation and Measurement.

[23]  Jr. J. L. Brown.  Multi-channel sampling of low-pass signals , 1981 .

[24]  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.

[25]  Håkan Johansson,et al.  Reconstruction of Nonuniformly Sampled Bandlimited Signals by Means of Time-Varying Discrete-Time FIR Filters , 2004, 2004 12th European Signal Processing Conference.

[26]  Sanjit K. Mitra,et al.  High-speed A/D conversion incorporating a QMF bank , 1992 .

[27]  D. Draxelmayr,et al.  Compensation of timing mismatches in time-interleaved analog-to-digital converters through transfer characteristics tuning , 2004, The 2004 47th Midwest Symposium on Circuits and Systems, 2004. MWSCAS '04..

[28]  Arthur H. M. van Roermund,et al.  Smart AD and DA converters , 2005, 2005 IEEE International Symposium on Circuits and Systems.

[29]  M. Kozak.  Oversampled Delta-Sigma Modulators: Analysis, Applications and Novel Topologies , 2003 .

[30]  Gernot Kubin,et al.  Spectral shaping of timing mismatches in time-interleaved analog-to-digital converters , 2005, 2005 IEEE International Symposium on Circuits and Systems.