A passive UHF RFID tag with a dynamic-V_(th)-cancellation rectifier

作     者：沈劲鹏 汪波 刘珊 王新安 阮正坤 李守成 

作者机构：The Key Laboratory of Integrated MicrosystemsPeking University Shenzhen Graduate School 

出 版 物：《Journal of Semiconductors》 (半导体学报（英文版）)

年 卷 期：2013年第34卷第9期

页      面：117-121页

核心收录：

学科分类：1305[艺术学-设计学（可授艺术学、工学学位）] 13[艺术学] 080801[工学-电机与电器] 0808[工学-电气工程] 081104[工学-模式识别与智能系统] 08[工学] 0804[工学-仪器科学与技术] 081101[工学-控制理论与控制工程] 0811[工学-控制科学与工程] 

主　　题：UHF RFID tag rectifier demodulator PCE 

摘      要：This paper presents a passive UHF RFID tag with a dynamicVthcancellation （DVC） rectifier. In the rectifier, the threshold voltages of MOSFETs are cancelled by applying gate bias voltages, which are dynamically changed according to the states of the MOSFETs. The DVC rectifier enables both low ONresistance and small re verse leakage of the MOSFETs, resulting in high power conversion efficiency （PCE）. An areaefficient demodulator with a novel average detector is also designed, which takes advantage of the rectifier＇s first stage as the envelope detector. The whole tag chip is implemented in a 0.18 μm CMOS process with a die size of 880 x 950μm2. Measurement results show that the rectifier achieves a maximum PCE of 53.7% with 80 kΩ resistor load.