Title :
A low distortion and high efficiency parallel-operation power amplifier combined in different phases in wide range of load impedances
Author :
Ikeda, H. ; Kosugi, H. ; Uwano, T.
Author_Institution :
Device Eng. Dev. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
Abstract :
We proposed a new four-paralleled power amplifier combined in different phases in order to accomplish a low distortion and high efficiency in a wide range of load impedances. We studied them by simulation and experiment and realized an amplifier in which adjacent channel leakage power of /spl pi//4-DQPSK modulation was improved by 13 dB in the range of load VSWR/spl les/3 without decreasing efficiency.
Keywords :
differential phase shift keying; electric distortion; power amplifiers; quadrature phase shift keying; /spl pi//4-DQPSK modulation; VSWR; adjacent channel leakage power; distortion; efficiency; load impedance; parallel-operation power amplifier; phase; Cellular phones; Circuits; Distortion measurement; Frequency; High power amplifiers; Impedance; Nonlinear distortion; Phase distortion; Power amplifiers; Radiofrequency amplifiers;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.510990
