Title :
Microwave Doherty Power Amplifier for High Efficiency and Linearity
Author :
Kim, Bumman ; Kim, Jangheon ; Kim, Ildu ; Cha, Jeonghyeon ; Hong, Sungchul
Author_Institution :
Dept. of Electr. Eng., Pohang Univ. of Sci. & Technol.
Abstract :
This paper explains the basic circuit configuration of microwave Doherty amplifier and additional design methods for wide bandwidth and high power applications. This paper also presents the recent experimental results of the group using the uneven power drive. Most of the previous works about microwave Doherty amplifier have employed identical input drives. In this works, two 1:1(2-way) and a 1:2(3-way) Doherty amplifiers are implemented at 2.14GHz center frequency using LDMOS with a peak envelope power of 180 watt and 285 watt, respectively. The 2-way Doherty amplifiers are optimized at 25 watt average output power for high efficiency and linearity and the 3-way Doherty amplifier at 16 watt average output power for high linearity. The amplifiers are tested using WCDMA 4FA signal. The performances of the 2-way Doherty amplifier are compared with that of the comparable class AB amplifier and the Doherty amplifier with even power drive. The performances of the 3-way Doherty amplifier are compared with that of the comparable class AB amplifier. The experimental results show the superior performances of our Doherty amplifiers
Keywords :
code division multiple access; microwave power amplifiers; power MOSFET; 16 W; 180 W; 2.14 GHz; 25 W; 285 W; Doherty power amplifiers; LDMOSFET; WCDMA; class AB amplifier; microwave power amplifiers; power drive; Bandwidth; Design methodology; Frequency; High power amplifiers; Linearity; Microwave amplifiers; Microwave circuits; Microwave theory and techniques; Power amplifiers; Power generation;
Conference_Titel :
Integrated Nonlinear Microwave and Millimeter-Wave Circuits, 2006 International Workshop on
Conference_Location :
Aveiro
Print_ISBN :
0-7803-9723-1
Electronic_ISBN :
0-7803-9723-1
DOI :
10.1109/INMMIC.2006.283499
