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An Oversampling-Based Fast Convergent Blind Technique for Gain Mismatch and Timing Skew Error Correction in Time-Interleaved ADCs

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Abstract

The channel mismatches, particularly the gain and the timing skew errors degrade significantly the performance of high-speed Time-Interleaved Analog-to-Digital converters (TIADCs). The error correction using blind calibration methods is difficult because of the correlation between the input signal and the noise signal caused by these channel mismatch errors. In this paper, a new fast convergent algorithm is proposed to correct the gain mismatch and timing skew errors. This new algorithm is based on oversampling and guarantees the independence of the signal and the noise. To estimate noise produced by gain mismatch and timing skew error, a new structure based on modulation concept is developed. The proposed adaptive compensation structure has fast convergence speed using an accurate estimated error signal and a simple cost function. The proposed structure unlike other oversampling-based algorithms is applicable in narrow-band signals by selecting the optimum oversampling ratio. The proposed algorithm is simulated using a four-channel TIADC with 10-bit resolution. Theoretical analysis and simulation results verified the fast convergence speed and the good performance of the proposed algorithm for both narrow-band and wide-band signals.

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Data sharing is not applicable to this article as no new data were created or analyzed in this study.

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Authors and Affiliations

  1. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran

    Ali Khakpour & Ghader Karimian

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  1. Ali Khakpour
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  2. Ghader Karimian
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Khakpour, A., Karimian, G. An Oversampling-Based Fast Convergent Blind Technique for Gain Mismatch and Timing Skew Error Correction in Time-Interleaved ADCs. Circuits Syst Signal Process 42, 2416–2432 (2023). https://doi.org/10.1007/s00034-022-02228-8

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