High efficiency CMOS rectifier circuits for UHF RFIDs using Vth cancellation techniques

Koji Kotani, Takashi Itoh

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

29 Citations (Scopus)

Abstract

Two types of CMOS rectifier circuits for UHF RFIDs have been proposed. Large power conversion efficiency (PCE) has been achieved by Vth cancellation techniques. In the Self-Vth-Cancellation (SVC) CMOS rectifier, the threshold voltage of MOSFETs is cancelled by gate bias voltage generated from the output voltage of the rectifier itself, resulting in excellent PCE. The differential-drive CMOS rectifier has a cross-coupled bridge configuration and is driven by a differential RF input. A differential-drive scheme realizes an active gate bias mechanism and simultaneously enables both low ON-resistance and small reverse leakage of diode-connected MOS transistors, resulting in large PCE, especially under small RF input power conditions. Test circuits for both types of rectifiers were fabricated and the measured performances were compared with those of conventional rectifiers.

Original languageEnglish
Title of host publicationASICON 2009 - Proceedings, 2009 8th IEEE International Conference on ASIC
Pages549-552
Number of pages4
DOIs
Publication statusPublished - 2009 Dec 1
Event2009 8th IEEE International Conference on ASIC, ASICON 2009 - Changsha, China
Duration: 2009 Oct 202009 Oct 23

Publication series

NameASICON 2009 - Proceedings 2009 8th IEEE International Conference on ASIC

Other

Other2009 8th IEEE International Conference on ASIC, ASICON 2009
CountryChina
CityChangsha
Period09/10/2009/10/23

Keywords

  • Radio frequency identification (RFID)
  • Rectifier
  • Ultra high frequency (UHF)
  • Vth cancellation

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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