Title :
High efficiency feed-forward amplifier using RF predistortion linearizer and the modified Doherty amplifier
Author :
Ogawa, T. ; Iwasaki, T. ; Maruyama, H. ; Horiguchi, K. ; Nakayama, M. ; Ikeda, Y. ; Kurebayashi, H.
Author_Institution :
SPC Electron. Corp., Tokyo, Japan
Abstract :
The prototype model of the high efficiency feed-forward amplifier using RF predistortion linearizer and the modified Doherty amplifier is developed, and the performance of the developed amplifier is examined experimentally. The efficiency of 13.6% with the output power of 45W is achieved under the condition that ACLR (Adjacent Channel Leakage Power Ratio) is -55 dBc in 3 GPP test method at room temperature of +25°C. This is the top level performance among the previously reported feed-forward amplifiers for cellular base stations. In concerning with the modified Doherty amplifier, which is the key component to enhance the efficiency of feed-forward amplifier, the design method and its performance is described in detail.
Keywords :
feedforward; power amplifiers; prototypes; radiofrequency amplifiers; 20 to 25 degC; 45 W; 55 dB; Adjacent Channel Leakage Power Ratio; GPP test method; RF predistortion linearizer; cellular base stations; high efficiency feed forward amplifier; modified Doherty amplifier; prototype model; room temperature; Base stations; Feedforward systems; Power amplifiers; Power generation; Predistortion; Prototypes; Radio frequency; Radiofrequency amplifiers; Temperature; Testing;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1336034
