A near-optimum 13.56 MHz active rectifier with circuit-delay real-time calibrations for high-current biomedical implants

Cheng Huang, Toru Kawajiri, Hiroki Ishikuro

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    4 Citations (Scopus)

    Abstract

    This paper presents a 13.56MHz active rectifier with enhanced power conversion efficiency (PCE) and voltage conversion ratio (VCR) for high-current biomedical implants. Near-optimum operation with compensated circuit delays is achieved by the proposed real-time NMOS on/off calibrations, which minimize the reverse current and maximize the transistor conduction time under various process, voltage, temperature and loading conditions. Adaptive sizing (AS) is also introduced to optimize the PCE over a wide loading range. Measurements in TSMC 65nm show more than 36% and 17% improvement in PCE and VCR, respectively, by the proposed techniques. With 2.5V input amplitude, the rectifier achieves a peak PCE of 94.8% with an 80Ω loading, a peak VCR of 98.7% with a 1kΩ loading, and a maximum output power of 248.1mW.

    Original languageEnglish
    Title of host publicationProceedings of the Custom Integrated Circuits Conference
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Volume2015-November
    ISBN (Print)9781479986828
    DOIs
    Publication statusPublished - 2015 Nov 25
    EventIEEE Custom Integrated Circuits Conference, CICC 2015 - San Jose, United States
    Duration: 2015 Sep 282015 Sep 30

    Other

    OtherIEEE Custom Integrated Circuits Conference, CICC 2015
    CountryUnited States
    CitySan Jose
    Period15/9/2815/9/30

    Keywords

    • Active rectifier
    • adaptive sizing
    • biomedical implants
    • circuit delays
    • conduction time
    • power conversion efficiency
    • real-time calibrations
    • reverse current
    • voltage conversion ratio
    • wireless power transfer

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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