Title :
A new amplifier power combining scheme with optimum efficiency under variable outputs
Author :
Hang, C.Y. ; Wang, Y. ; Itoh, T.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
This paper presents a new power combining scheme, which has either one or four amplifiers on depending upon the levels of input signal. This approach realized by utilizing a unique combiner that is lossless and has constant gain under both scenarios. As a result, for the system where variable output power is required, this combining scheme can be used in an amplifier design with optimum efficiency. Measurement data show 15% power efficiency for the four-amplifier scenario and 28% for the single amplifier scenario at 13dBm input power. We also investigate the possibility of using this combiner in an envelope tracking amplifier.
Keywords :
UHF integrated circuits; UHF power amplifiers; circuit optimisation; microstrip circuits; power combiners; 2.2 GHz; amplifier design; amplifier power combining scheme; dual-state combiner; envelope tracking amplifier; four-amplifier scenario; input signal levels; microstrip combiner; optimum efficiency; power amplifiers; power efficiency; single amplifier scenario; variable outputs; Batteries; Energy consumption; Impedance; Linearity; Phased arrays; Power amplifiers; Power generation; Power measurement; Switches; Topology;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1011778
