EXTENDING BATTERY LIFE WITH 10 MHz HBT DC-DC CONVERTERS IN WIRELESS SYSTEMS

摘要

This paper presents a technique for raising system efficiency in portable wireless applications by integrating a variable output dc-dc converter as the V_(DD) supply for the final MESFET RF amplifier. Significant increases in power efficiency are obtainable over a large range of output levels. The approach includes utilization of a envelope detector, closed feedback loop, and pulse width modulator operating at 10 MHz. For 300 mW transmitters, savings up to 1.45 times in battery life can be achieved.