A High-Precision Time Skew Estimation and Correction Technique for Time-Interleaved ADCs
|Title:||A High-Precision Time Skew Estimation and Correction Technique for Time-Interleaved ADCs||Authors:||Salib, Armia; Flanagan, 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:||Estimation; Taylor series; Convergence; Bandwidth; Time measurement; Correlation||DOI:||10.1109/tcsi.2019.2915282||Language:||en||Status of Item:||Peer reviewed|
|Appears in Collections:||Electrical and Electronic Engineering Research Collection|
Show full item record
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.