Radio-triggered solar and RF power scavenging and management for ultra low power wireless medical applications

摘要

The design of a dual-source power scavenging and management system for ultra low power wireless medical applications is presented. Power scavenging is achieved by harvesting energy both from solar (primary) and RF power (secondary) sources. Depending on the available energy, the system can supply 1-2mW of power to a wireless device, with up to a 50% duty cycle. A radio-triggering based technique is used to control the activation and shutting down of the complete wireless system, and thus eliminates energy wasting wake-up periods. The system provides a regulated output voltage of 1.5V, with a total power consumption of less than 8.0/spl mu/W in the sleep mode, and 48/spl mu/W in the operating mode.