TY - GEN
T1 - High efficiency CMOS rectifier circuits for UHF RFIDs using Vth cancellation techniques
AU - Kotani, Koji
AU - Ito, Takashi
PY - 2009/12/1
Y1 - 2009/12/1
N2 - 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.
AB - 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.
KW - Radio frequency identification (RFID)
KW - Rectifier
KW - Ultra high frequency (UHF)
KW - Vth cancellation
UR - http://www.scopus.com/inward/record.url?scp=77949362425&partnerID=8YFLogxK
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U2 - 10.1109/ASICON.2009.5351344
DO - 10.1109/ASICON.2009.5351344
M3 - Conference contribution
AN - SCOPUS:77949362425
SN - 9781424438686
T3 - ASICON 2009 - Proceedings 2009 8th IEEE International Conference on ASIC
SP - 549
EP - 552
BT - ASICON 2009 - Proceedings, 2009 8th IEEE International Conference on ASIC
T2 - 2009 8th IEEE International Conference on ASIC, ASICON 2009
Y2 - 20 October 2009 through 23 October 2009
ER -