Wide-Range Adaptive RF-to-DC Power Converter for UHF RFIDs

 Wide-Range Adaptive RF-to-DC Power Converter for UHF RFIDs

 A wide-range, differential, cross-coupled rectifier is proposed with an extended dynamic range of input RF power that enables wireless powering from varying distances. The proposed architecture mitigates the reverse-leakage problem in conventional, cross-coupled rectifiers without degrading sensitivity. A prototype is designed for UHF RFID applications, and is implemented using 0.18 ?m CMOS technology. On-chip measurements demonstrate a sensitivity of?18 dBmfor 1 V output over a 100 k? load and a peak RF-to-DC power conversion efficiency of 65%.