A Low-Complexity Correlation-Based Time Skew Estimation Technique for Time-Interleaved SAR ADCs

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Title: A Low-Complexity Correlation-Based Time Skew Estimation Technique for Time-Interleaved SAR ADCs
Authors: Salib, ArmiaCardiff, BarryFlanagan, Mark F.
Permanent link: http://hdl.handle.net/10197/11131
Date: 31-May-2017
Online since: 2019-10-08T15:26:42Z
Abstract: This paper presents a technique to estimate the time skew in time-interleaved ADCs. The proposed method estimates all of the time skew parameters jointly based on observations from a bank of correlators. The proposed method works for an arbitrary number of sub-ADCs. For implementation of the correlator bank, we propose the use of Mitchell's logarithmic multiplier and a hardware reuse mechanism, thereby reducing the complexity and power consumption. Also, we explain why blind estimation techniques alone (including the proposed one) are not always sufficient for time skew estimation for certain classes of input signal; for the proposed approach, however, a simple modification to the analogue circuit (suitable for SAR ADCs) is shown to successfully deal with such problems, with only a minor penalty in power and area. The technique is verified by extensive simulations including a spectrally rich input signal in which an MTPR (multi-tone power ratio) improvement from 29dB to 62dB was achieved for a TIADC system having 16 sub-ADCs.
Funding Details: European Commission - European Regional Development Fund
Science Foundation Ireland
Type of material: Conference Publication
Publisher: IEEE
Copyright (published version): 2017 IEEE
Keywords: TIADCTime skewEstimationBlind calibration
DOI: 10.1109/ISCAS.2017.8050309
Language: en
Status of Item: Peer reviewed
Is part of: 2017 IEEE International Symposium on Circuits and Systems (ISCAS) Proceedings
Conference Details: The 2017 IEEE International Symposium on Circuits and Systems (ISCAS), Baltimore, Maryland, United States of America, 28-31 May 2017
ISBN: 9781467368520
Appears in Collections:Electrical and Electronic Engineering Research Collection

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