Fast convergent background calibration technique for timing mismatch in M-channel time-interleaved ADCs

Xiong, Wei; Zhang, Zhenwei; Sun, Lin; Liu, Yu; Liu, Haijing; Lang, Lili; Dong, Yong

doi:10.1016/j.aeue.2022.154282

Cited by 6 publications

(7 citation statements)

References 22 publications

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“…The EFGM comprises multiple subtractors that calculate timing error functions B k . CCM computes the product's average of adjacent channels R k,k+1 , which serves as a moving average filter and is composed of various multipliers and adders [22]. The output of R k,k+1 can be expressed as:…”

Section: Proposed Calibration Architecturementioning

confidence: 99%

“…Many fully digital calibration techniques have been proposed in previous research [18][19][20][21][22][23][24][25][26]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, the second-order error terms possess the same conjugate symmetry, and thus we can also use this to reduce the complexity of the operation. Expanding our previous research [22], a coarse-fine correction method is employed, based on the second-order Taylor series, to eliminate higher-order timing-skew errors. During the initial coarse correction stage, the first-order Taylor series approximation is utilized to correct y[n], expressed as follows:…”

mentioning

confidence: 99%

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A Novel Fully Digital Feedforward Background Calibration Technique for Timing Mismatch in M-Channel Time-Interleaved ADCs

et al. 2023

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This paper presents a novel digital background calibration technique for timing mismatches in time-interleaved analog-to-digital converters (TIADCs). We reconstruct and eliminate the timing mismatch based on the theory of timing-mismatch-induced spurious signals in the frequency domain. The proposed compensation algorithm utilizes the conjugate property between spurious signals to achieve low complexity. A coarse-fine correction architecture is adopted to eliminate higher-order time-skew errors. A novel feedforward estimation algorithm based on the correlation of adjacent channels is proposed to extract the time-skew errors. Our proposed calibration technique is suitable for an arbitrary number of channels. The simulation results demonstrate that the utilization of the proposed calibration technique yields significant improvements in both the signal-to-noise-and-distortion ratio (SNDR) and spurious-free dynamic range (SFDR). The SNDR and SFDR are improved from 55.82 dB and 56.64 dB to 79.92 dB and 105.98 dB, respectively.

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Section: Proposed Calibration Architecturementioning

confidence: 99%

“…Many fully digital calibration techniques have been proposed in previous research [18][19][20][21][22][23][24][25][26]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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A Novel Fully Digital Feedforward Background Calibration Technique for Timing Mismatch in M-Channel Time-Interleaved ADCs

et al. 2023

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“…Blind estimation techniques are flexible to use, but the convergence speed and nonuniform sampling become the main problems. Another option is based on signal correlation [16][17][18][19][20]. The method in [16] estimated the timing mismatch through the difference in the autocorrelation functions between adjacent channels.…”

Section: Introductionmentioning

confidence: 99%

“…With regard to compensation in the digital domain, there are methods that are based on fractional delay filters [23][24][25], Taylor approximation [19,[26][27][28][29] and so on. Law, Hurst and Lewis [24] used all-pass fractional delay filter banks to compensate for the timing mismatch.…”

Section: Introductionmentioning

confidence: 99%

A Digital Timing-Mismatch Calibration Technique for Time-Interleaved ADCs Based on a Coordinate Rotational Digital Computer Algorithm

et al. 2023

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Timing-mismatch errors among channels in time-interleaved analog-to-digital converters (TIADCs) greatly degrade the whole performance of the system. Therefore, techniques for calibrating timing mismatch are indispensable, and a new fully-digital calibration technique is presented in this article. Based on a Hilbert filter, modified moving averagers (MMAs) and inverse cosine functions, the proposed estimation algorithm is fast (within 1200 sample points) and accurate. Meanwhile, the coordinate rotational digital computer (CORDIC) algorithm, which is used to implement inverse cosine functions, is also improved, giving it higher precision. In addition, a compensation method based on second-order Taylor series approximation with less hardware resource consumption is provided. Through analyses and simulations, this calibration technique proved to be suitable for TIADCs with an arbitrary number of channels, in which the signal-to-noise and distortion ratio (SNDR) and the spurious-free dynamic range (SFDR) were, respectively, improved from 24.06 dB and 24.57 dB to 67.96 dB and 85.69 dB.

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An improved wide-range, low-complexity, fully-parallel digital background timing mismatch calibration method for dual-channel TIADC based on perfect reconstruction filter bank

Liu,

Zhang,

Xiong

et al. 2023

AEU - International Journal of Electronics and Communications

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Fast convergent background calibration technique for timing mismatch in M-channel time-interleaved ADCs

Cited by 6 publications

References 22 publications

A Novel Fully Digital Feedforward Background Calibration Technique for Timing Mismatch in M-Channel Time-Interleaved ADCs

A Novel Fully Digital Feedforward Background Calibration Technique for Timing Mismatch in M-Channel Time-Interleaved ADCs

A Digital Timing-Mismatch Calibration Technique for Time-Interleaved ADCs Based on a Coordinate Rotational Digital Computer Algorithm

An improved wide-range, low-complexity, fully-parallel digital background timing mismatch calibration method for dual-channel TIADC based on perfect reconstruction filter bank

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