Title :
RF high power Doherty amplifier for improving the efficiency of a Feedforward linear amplifier
Author :
Cho, Kyoung-Joon ; Kim, Jong-Heon ; Stapleton, Shawn P.
Author_Institution :
Dept. of Radio Sci. & Eng., Kwangwoon Univ., South Korea
Abstract :
This paper presents a RF high power Doherty amplifier for improving the efficiency of a 30 W Feedforward linear amplifier used in W-CDMA base-station applications. A Doherty amplifier using a single push-pull LDMOS FET is proposed as the main amplifier of the Feedforward linear amplifier. The peaking amplifier´s compensation line and gate bias effects are analyzed, at a 6 dB backed off. From the experimental results, a 2.2% PAE improvement on the 30 W Doherty Feedforward linear amplifier is achieved in comparison to a conventional Feedforward linear amplifier.
Keywords :
code division multiple access; differential amplifiers; feedforward; linearisation techniques; microwave power amplifiers; power field effect transistors; 30 W; 6 dB; RF high power Doherty amplifier; W-CDMA base-station applications; compensation line; feedforward linear amplifier; gate bias effects; single push-pull LDMOS FET; FETs; High power amplifiers; Linearity; Multiaccess communication; Power amplifiers; Power engineering and energy; Radio frequency; Radiofrequency amplifiers; Repeaters; Voltage;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1339100
