Digital correction of frequency response mismatches in 2-channel time-interleaved ADCs using adaptive I/Q signal processing

A novel adaptive compensation architecture for the frequency response mismatch of 2-channel time-interleaved ADC (TI-ADC) is proposed for developing high-performance self-adaptive systems. The proposed approach overcomes the existing methods in the sense that the TI-ADC mismatch identification can be performed without allocating a region where only the TI-ADC mismatch spurs are present. This is accomplished via mapping the TI-ADC problem into an I/Q mismatch problem which allows deploying complex statistical signal processing. As proof of concept, the compensation architecture is demonstrated and tested on a 16-bit TI-ADC measured hardware data.

[1]  Minyue Fu,et al.  Linear LMS Compensation for Timing Mismatch in Time-Interleaved ADCs , 2009, IEEE Transactions on Circuits and Systems I: Regular Papers.

[2]  Bernard C. Levy,et al.  Blind Calibration of Timing Offsets for Four-Channel Time-Interleaved ADCs , 2007, IEEE Transactions on Circuits and Systems I: Regular Papers.

[3]  Xiaofei Chen,et al.  A novel PR channelizer-based architecture for estimation and correction of timing and gain mismatches in two channel TI-ADCs , 2012, 2012 IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS).

[4]  P.J. Hurst,et al.  A 10b 120MSample/s time-interleaved analog-to-digital converter with digital background calibration , 2002, 2002 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.02CH37315).

[5]  Katharina Hausmair,et al.  A review on low-complexity structures and algorithms for the correction of mismatch errors in time-interleaved ADCs , 2012, 10th IEEE International NEWCAS Conference.

[6]  Mikko Valkama,et al.  A novel blind adaptive correction algorithm for 2-channel time-interleaved ADCs , 2013 .

[7]  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.

[8]  Stephen H. Lewis,et al.  A Four-Channel Time-Interleaved ADC With Digital Calibration of Interchannel Timing and Memory Errors , 2010, IEEE Journal of Solid-State Circuits.

[9]  Mikko Valkama,et al.  2-channel Time-Interleaved ADC frequency response mismatch correction using adaptive I/Q signal processing , 2013, 2013 IEEE 56th International Midwest Symposium on Circuits and Systems (MWSCAS).

[10]  David Nairn.  Time-interleaved analog-to-digital converters , 2008, 2008 IEEE Custom Integrated Circuits Conference.

[11]  Håkan Johansson,et al.  A Polynomial-Based Time-Varying Filter Structure for the Compensation of Frequency-Response Mismatch Errors in Time-Interleaved ADCs , 2009, IEEE Journal of Selected Topics in Signal Processing.

[12]  Mikko Valkama,et al.  Blind Moment Estimation Techniques for I/Q Imbalance Compensation in Quadrature Receivers , 2006, 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications.

[13]  Chun-Cheng Huang,et al.  A CMOS 6-Bit 16-GS/s Time-Interleaved ADC Using Digital Background Calibration Techniques , 2011, IEEE Journal of Solid-State Circuits.

[14]  Behzad Razavi.  Problem of timing mismatch in interleaved ADCs , 2012, Proceedings of the IEEE 2012 Custom Integrated Circuits Conference.

[15]  Håkan Johansson,et al.  A Least-Squares Filter Design Technique for the Compensation of Frequency Response Mismatch Errors in Time-Interleaved A/D Converters , 2008, IEEE Transactions on Circuits and Systems II: Express Briefs.

[16]  Mikko Valkama,et al.  A blind frequency response mismatch correction algorithm for 4-channel Time-Interleaved ADC , 2014, 2014 IEEE International Symposium on Circuits and Systems (ISCAS).

[17]  Mikko Valkama,et al.  Circularity-Based I/Q Imbalance Compensation in Wideband Direct-Conversion Receivers , 2008, IEEE Transactions on Vehicular Technology.

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

[19]  Boris Murmann.  Digitally assisted data converter design , 2013, 2013 Proceedings of the ESSCIRC (ESSCIRC).

[20]  Mikko Valkama,et al.  Blind Compensation of Frequency-Selective I/Q Imbalances in Quadrature Radio Receivers: Circularity -Based Approach , 2007, 2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07.

[21]  Haruo Kobayashi,et al.  Explicit analysis of channel mismatch effects in time-interleaved ADC systems , 2001 .

[22]  Håkan Johansson,et al.  Time-interleaved analog-to-digital converters: status and future directions , 2006, 2006 IEEE International Symposium on Circuits and Systems.

[23]  Christian Vogel,et al.  Adaptive Blind Background Calibration of Polynomial-Represented Frequency Response Mismatches in a Two-Channel Time-Interleaved ADC , 2011, IEEE Transactions on Circuits and Systems I: Regular Papers.