WIRELESS POWER MANAGEMENT CIRCUITS FOR BIOMEDICAL IMPLANTABLE SYSTEMS

Abstract

In this thesis, a wireless power recovery system with data link for implantable systems and a new full-wave active rectifier with high power efficiency are described. A 2-stage time division based rectifier is proposed to provide 3 DC outputs simultaneously, improving the power efficiency without introducing any impact on the forward data recovery. The power management system is fabricated in a 0.18-?m CMOS process with 24V HV LDMOS option.

In the second part of the thesis, an active full-wave rectifier for wireless power recovery is presented. The rectifier dynamically senses the conduction time error caused by carrier voltage amplitude and frequency variation, and compensates the error by adjusting the comparator input offset through a proposed algorithm. Fabricated in a 0.35-?m CMOS process, the rectifier achieves greater than 80% power efficiency at wide carrier frequency and amplitude.