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    A 33fJ/Step SAR Capacitance-to-Digital Converter Using a Chain of Inverter-Based Amplifiers

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    Type
    Article
    Authors
    Omran, Hesham cc
    Alhoshany, Abdulaziz cc
    Alahmadi, Hamzah cc
    Salama, Khaled N. cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Date
    2016-11-16
    Online Publication Date
    2016-11-16
    Print Publication Date
    2017-02
    Permanent link to this record
    http://hdl.handle.net/10754/622499
    
    Metadata
    Show full item record
    Abstract
    A 12 - bit energy-efficient capacitive sensor interface circuit that fully relies on capacitance-domain successive approximation (SAR) technique is presented. Analysis shows that for SAR capacitance-to-digital converter (CDC) comparator offset voltage will result in parasitic-dependent conversion errors, which necessitates using an offset cancellation technique. Based on the presented analysis, a SAR CDC that uses a chain of cascode inverter-based amplifiers with near-threshold biasing is proposed to provide robust, energy-efficient, and fast operation. A hybrid coarse-fine capacitive digital-to-analog converter (CapDAC) achieves 11.7 - bit effective resolution, and provides 83% area saving compared to a conventional binary weighted implementation. The prototype fabricated in a 0.18μm CMOS technology is experimentally verified using MEMS capacitive pressure sensor. Experimental results show an energy efficiency figure-of-merit (FoM) of 33 f J/Step which outperforms the state-of-the-art. The CDC output is insensitive to analog references; thus, a very low temperature sensitivity of 2.3 ppm/°C is achieved without the need for calibration.
    Citation
    Omran H, Alhoshany A, Alahmadi H, Salama KN (2016) A 33fJ/Step SAR Capacitance-to-Digital Converter Using a Chain of Inverter-Based Amplifiers. IEEE Transactions on Circuits and Systems I: Regular Papers: 1–12. Available: http://dx.doi.org/10.1109/TCSI.2016.2608905.
    Sponsors
    The authors would like to thank the reviewers for their valuable and stimulating comments.
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Transactions on Circuits and Systems I: Regular Papers
    DOI
    10.1109/TCSI.2016.2608905
    Additional Links
    http://ieeexplore.ieee.org/document/7744463/
    ae974a485f413a2113503eed53cd6c53
    10.1109/TCSI.2016.2608905
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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