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

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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

Cite this

Huang, C., Kawajiri, T., & Ishikuro, H. (2015). A near-optimum 13.56 MHz active rectifier with circuit-delay real-time calibrations for high-current biomedical implants. In Proceedings of the Custom Integrated Circuits Conference (Vol. 2015-November). [7338391] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CICC.2015.7338391