A 13.56 MHz Active Rectifier With Self-Switching Comparator for Wireless Power Transfer Systems

This paper presents a 13.56 MHz active rectifier for wireless power transfer (WPT) systems with self-switching comparator technology. The self-switching scheme reduces the static power consumption of the comparators that gate the power transistors in the active rectifier. The power conversion efficiency (PCE) of the rectifier is enhanced by more than 6.7% using the self-switching technology. The rectifier was fabricated in a 65nm CMOS process. Measured results show that the rectifier achieves a peak PCE of 75.4% under 10dBm input power.