Title :
CMOS Outphasing Class-D Amplifier With Chireix Combiner
Author :
Hung, Tsai-Pi ; Choi, David K. ; Larson, Lawrence E. ; Asbeck, Peter M.
Author_Institution :
California Univ., San Diego
Abstract :
This letter presents a CMOS outphasing class-D power amplifier (PA) with a Chireix combiner. Two voltage-mode class-D amplifiers used in the outphasing system were designed and implemented with a 0.18-mum CMOS process. By applying the Chireix combiner technique, drain efficiency of the outphasing PA for CDMA signals was improved from 38.6% to 48% while output power was increased from 14.5 to 15.4 dBm with an adjacent channel power ratio of -45 dBc.
Keywords :
CMOS integrated circuits; MMIC power amplifiers; power combiners; CMOS outphasing class-D amplifier; Chireix combiner; efficiency 38.6 percent; efficiency 48 percent; power amplifier; size 0.18 mum; voltage-mode class-D amplifiers; High power amplifiers; Impedance; Linearity; MOS devices; Multiaccess communication; Power amplifiers; Power generation; Radio frequency; Radiofrequency amplifiers; Voltage; CMOS amplifiers; Chireix combiners; outphasing amplifiers;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2007.901800
