This paper presents a technique for raising power efficiency in portable wireless transmitters by integrating a variable voltage output dc-dc converter together with a MESFET F W power amplifier. Significant increases in power efficiency are obtainable over a large range of output power levels. The system includes an envelope detector, a closed feedback loop, and a pulse width modulator operating at 10 MHz. A 300mW transmitter is shown for which battery life can be extended by over 1.4 times.
PowerHigh wastf!d ef'ficierq
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.