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Fully digital background calibration of channel mismatches in time-interleaved ADCs using recursive least square algorithm

Hoang, V.-P. and Ta, V.-T. (2021) Fully digital background calibration of channel mismatches in time-interleaved ADCs using recursive least square algorithm. AEU - International Journal of Electronics and Communications, 130: 153574. ISSN 14348411

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Abstract

Time-interleaved analog-to-digital converters (TIADCs) have been considered as a very promising solution for high-speed direct sampling receivers. However, channel mismatches reduce the TIADC's performance significantly. Therefore, calibration of these mismatches is emerging to maintain the performance of these TIADCs. This paper proposes a fully digital background calibration technique for multiple deviations including offset, gain, and timing mismatches. Offset and gain deviations in TIADCs are sequentially calibrated by taking the average value of the output samples, and calculating the ratios of power, respectively. Then, the timing mismatch is compensated by using the Hadamard matrix and the adaptive recursive least square (RLS) algorithm. The proposed calibration technique is proven through the simulation results for signal-to-noise-and-distortion (SNDR), spurious-free dynamic range (SFDR) and time convergence. As a result, the performance of TIADC is improved by 40.98 dB and 70.64 dB for SNDR and SFDR, respectively. © 2020 Elsevier GmbH

Item Type: Article
Divisions:
Faculties > Faculty of Radio-Electronic Engineering
Identification Number: 10.1016/j.aeue.2020.153574
Uncontrolled Keywords: Calibration; Hadamard matrices; Signal to noise ratio; Calibration techniques; Digital background calibration; Recursive Least Square algorithm; Recursive least square algorithms; Signal to noise and distortions; Spurious free dynamic range; Time-interleaved adcs; Time-interleaved analog to digital converters; Analog to digital conversion
Additional Information: Language of original document: English.
URI: http://eprints.lqdtu.edu.vn/id/eprint/8694

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