A Simple Novel Wireless Integrated Power Management Unit (PMU) for Rechargeable Battery-Operated Implantable Biomedical Telemetry Systems

This paper presents a novel wireless integrated power management unit (PMU) for implantable biomedical telemetry systems. The PMU was fabricated in a 0.35 mu m CMOS technology occupying approximately 1x1 mm(2). First, the presented unit can recharge implanted batteries via radio frequency power transmitted from an RF source. The charging voltage can be set in the range of 4.28V similar to 5.3V for various batteries. The typical charging current is 200uA. Second, it provides on/ off switching through external wireless control. Third, it has an ultra low standby current about 5pA. The size is reduced by a simplified control logic circuit and one inductive link coil to transfer the energy and data. The simplicity and modular feature make it a useful power interface designed for rechargeable battery-operated medical telemetry implants.