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

doi:10.1109/CICC.2015.7338391

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

Department of Electronics and Electrical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

8 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 language	English
Title of host publication	2015 IEEE Custom Integrated Circuits Conference, CICC 2015
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781479986828
DOIs	https://doi.org/10.1109/CICC.2015.7338391
Publication status	Published - 2015 Nov 25
Event	IEEE Custom Integrated Circuits Conference, CICC 2015 - San Jose, United States Duration: 2015 Sept 28 → 2015 Sept 30

Publication series

Name	Proceedings of the Custom Integrated Circuits Conference
Volume	2015-November
ISSN (Print)	0886-5930

Other

Other	IEEE Custom Integrated Circuits Conference, CICC 2015
Country/Territory	United States
City	San Jose
Period	15/9/28 → 15/9/30

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

Access to Document

10.1109/CICC.2015.7338391

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 2015 IEEE Custom Integrated Circuits Conference, CICC 2015 Article 7338391 (Proceedings of the Custom Integrated Circuits Conference; Vol. 2015-November). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CICC.2015.7338391

A near-optimum 13.56 MHz active rectifier with circuit-delay real-time calibrations for high-current biomedical implants. / Huang, Cheng; Kawajiri, Toru; Ishikuro, Hiroki.
2015 IEEE Custom Integrated Circuits Conference, CICC 2015. Institute of Electrical and Electronics Engineers Inc., 2015. 7338391 (Proceedings of the Custom Integrated Circuits Conference; Vol. 2015-November).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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 2015 IEEE Custom Integrated Circuits Conference, CICC 2015., 7338391, Proceedings of the Custom Integrated Circuits Conference, vol. 2015-November, Institute of Electrical and Electronics Engineers Inc., IEEE Custom Integrated Circuits Conference, CICC 2015, San Jose, United States, 15/9/28. https://doi.org/10.1109/CICC.2015.7338391

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

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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.",

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",

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AB - 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.

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

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