A Near-Optimum 13.56 MHz CMOS Active Rectifier with Circuit-Delay Real-Time Calibrations for High-Current Biomedical Implants

Cheng Huang, Toru Kawajiri, Hiroki Ishikuro

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

In this paper, a near-optimum active rectifier is proposed to achieve well-optimized power conversion efficiency (PCE) and voltage conversion ratio (VCR) under various process, voltage, temperature (PVT) and loading conditions. The near-optimum operation includes: eliminated reverse current loss and maximized conduction time achieved by the proposed sampling-based real-time calibrations with automatic circuit-delay compensation for both on- and off-time of active diodes considering PVT variations; and power stage optimizations with adaptive sizing over a wide loading range. The design is fabricated in TSMC 65 nm process with standard I/O devices. Measurement results show more than 36% and 17% improvement in PCE and VCR, respectively, by the proposed techniques. A peak PCE of 94.8% with an 80Ω loading, a peak VCR of 98.7% with 1 kΩ loading, and a maximum output power of 248.1 mW are achieved with 2.5 V input amplitude.

Original languageEnglish
Article number7511780
Pages (from-to)1797-1809
Number of pages13
JournalIEEE Journal of Solid-State Circuits
Volume51
Issue number8
DOIs
Publication statusPublished - 2016 Aug

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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