Title :
Experimental investigation on efficiency and linearity of microwave Doherty amplifier
Author :
Youngoo Yang ; Jaehyok Yi ; Young Yun Woo ; Bumman Kim
Author_Institution :
Dept. of Electron. & Electr. Eng., POSTECH, South Korea
Abstract :
We have investigated the microwave Doherty amplifier, testing for efficiency and linearity. For the experiment, a 1.4 GHz Doherty amplifier has been implemented using a silicon LDMOSFET. The Doherty amplifier-I (a combination of a class B carrier amplifier and a class C peaking amplifier) and the Doherty amplifier-II (a combination of a class AB carrier amplifier and a class C peaking amplifier) have been compared with class B and AB amplifiers, respectively, using single-tone, two-tone, and forward-link CDMA signals. It demonstrated the superior performance of Doherty amplifiers. The results provide a topology selection guide of the CDMA base station power amplifier to achieve both linearity and efficiency enhancements.
Keywords :
MOSFET circuits; code division multiple access; microwave power amplifiers; 1.4 GHz; Si; base station; circuit topology; class AB carrier amplifier; class B carrier amplifier; class C peaking amplifier; efficiency; forward-link CDMA signal; linearity; microwave Doherty amplifier; power amplifier; silicon LDMOSFET; single-tone CDMA signal; two-tone CDMA signal; Base stations; Circuits; Electromagnetic heating; High power amplifiers; Impedance; Linearity; Microwave amplifiers; Multiaccess communication; Operational amplifiers; Power amplifiers;
Conference_Titel :
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6538-0
DOI :
10.1109/MWSYM.2001.967150
