A High-Precision Time Skew Estimation and Correction Technique for Time-Interleaved ADCs

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Title: A High-Precision Time Skew Estimation and Correction Technique for Time-Interleaved ADCs
Authors: Salib, ArmiaFlanagan, Mark F.Cardiff, Barry
Permanent link: http://hdl.handle.net/10197/11137
Date: Oct-2019
Online since: 2019-10-09T16:48:58Z
Abstract: This paper presents an all-digital background calibration technique for the time skew mismatch in time-interleaved ADCs (TIADCs). The technique jointly estimates all of the time skew values by processing the outputs of a bank of correlators. A low-complexity sampling sequence intervention technique, suitable for successive approximation register (SAR) ADC architectures, is proposed to overcome the limitations associated with blind estimation. A two-stage digital correction mechanism based on the Taylor series is proposed to satisfy the target high-precision correction. A quantitative study is performed regarding the requirements imposed on the digital correction circuit in order to satisfy the target performance and yield, and a corresponding filter design method is proposed, which is tailored to meet these requirements. Mitchell's logarithmic multiplier is adopted for the implementation of the principal multipliers in both the estimation and correction mechanisms, leading to a 25% area and power reduction in the estimation circuit. The proposed calibration is synthesized using a TSMC 28-nm HPL process targeting a 2.4-GHz sampling frequency for an eight-sub-ADC system. The calibration block occupies 0.03 mm² and consumes 11 mW. The algorithm maintains the SNDR above 65 dB for a sinusoidal input within the target bandwidth.
Funding Details: European Commission - European Regional Development Fund
Science Foundation Ireland
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Circuits and Systems I: Regular Papers
Volume: 66
Issue: 10
Start page: 3747
End page: 3760
Copyright (published version): 2019 IEEE
Keywords: EstimationTaylor seriesConvergenceBandwidthTime measurementCorrelation
DOI: 10.1109/tcsi.2019.2915282
Language: en
Status of Item: Peer reviewed
Appears in Collections:Electrical and Electronic Engineering Research Collection

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