High Efficiency CMOS Rectifier Circuits for UHF RFIDs Using Vth Cancellation Techniques
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.
rectifier radio frequency identification (RFID) ultra high frequency (UHF) Vth cancellation
Koji Kotani Takashi Ito
Department of Electronics,Graduate School of Engineering,Tohoku University,Sendai 980-8579 JAPAN
国际会议
2009 IEEE 8th International Conference on ASIC(第八届IEEE国际专用集成电路大会)
长沙
英文
549-552
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）