Title :
A Doherty power amplifier module for mobile terminals with variable linearity function
Author :
Kato, Takayuki ; Yamaguchi, Keiichi ; Kuriyama, Yasuhiko
Author_Institution :
Toshiba Corp., Kawasaki
Abstract :
A Doherty power amplifier (PA) module for mobile terminals with variable linearity function has been developed. The linearity of the Doherty PA module is optimized according to transmission signals by a bias switching technique. The Doherty amplifier module consists of a gain amplifier and a Doherty amplifier. One GaAs HBT for a gain amplifier and two GaAs HBTs for a Doherty amplifier are integrated onto a single GaAs MMIC (1.0 mm x 1.0 mm x 0.1 mm) chip. The module achieved 26.7 (I Bin output power with less than -38 dBc adjacent channel leakage power ratio (ACLR) in W-CDMA uplink mode, and 21 dBm output power with less than 3.0% error vector magnitude (EVM) was obtained in orthogonal frequency division multiplexing (OFDM) 64-QAM mode. The developed Doherty PA module is suitable for a multi-mode terminal including various high peak-to-average power ratio (PAPR) signals such as code division multiple access (CDMA) and OFDM.
Keywords :
III-V semiconductors; MMIC; OFDM modulation; broadband networks; code division multiple access; gallium arsenide; heterojunction bipolar transistors; mobile communication; power amplifiers; quadrature amplitude modulation; 64-QAM mode; Doherty power amplifier module; HBT; MMIC; OFDM; W-CDMA uplink mode; adjacent channel leakage power ratio; bias switching technique; code division multiple access; error vector magnitude; gain amplifier; mobile terminals; multi-mode terminal; orthogonal frequency division multiplexing; peak-to-average power ratio; variable linearity function; Circuits; Gallium arsenide; Impedance matching; Linearity; MMICs; Multiaccess communication; OFDM; Peak to average power ratio; Power amplifiers; Radiofrequency amplifiers; 64-QAM; Doherty amplifier; Dual mode; Mobile terminals; OFDM; Power amplifier module; W-CDMA;
Conference_Titel :
Microwave Conference, 2006. APMC 2006. Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-4-902339-08-6
Electronic_ISBN :
978-4-902339-11-6
DOI :
10.1109/APMC.2006.4429776
