Title :
Microwave power amplifier efficiency improvement with a 10 MHz HBT DC-DC converter
Author :
Hanington, G. ; Chen, P.F. ; Radisic, V. ; Itoh, T. ; Asbeck, P.M.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
Abstract :
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 RF 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 300 mW transmitter is shown for which battery life can be extended by over 1.4 times.
Keywords :
gallium arsenide; 10 MHz; 300 mW; GaAs; HBT DC-DC converter; MESFET RF power amplifier; PWM; battery life extension; closed feedback loop; efficiency improvement; envelope detector; microwave power amplifier; portable wireless transmitters; pulse width modulator; variable voltage output converter; DC-DC power converters; Heterojunction bipolar transistors; MESFETs; Microwave amplifiers; Power amplifiers; Pulse amplifiers; Pulse width modulation; Radiofrequency amplifiers; Transmitters; Voltage;
Conference_Titel :
Microwave Symposium Digest, 1998 IEEE MTT-S International
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-4471-5
DOI :
10.1109/MWSYM.1998.705062
