Title :
Highly efficient feed-forward amplifier employing a harmonic reaction amplifier
Author :
Suzuki, Yasunori ; Narahashi, Shoichi ; Nojima, Toshio
Author_Institution :
Res. Labs., NTT DOCOMO, Inc., Yokosuka
Abstract :
This paper proposes a new feed-forward amplifier configuration that employs a harmonic reaction amplifier as the main amplifier for high-efficiency operation. The fabricated 2-GHz band 20-W class feed-forward amplifier achieves the efficiency of 19.3% at the adjacent channel leakage power ratio of -45 dBc and the output power of 39 dBm using a W-CDMA test signal. The proposed feed-forward amplifier configuration achieves nearly 20% efficiency, which is the highest efficiency achieved by a 2-GHz band, 20-W class feed-forward amplifier for mobile communication systems.
Keywords :
code division multiple access; feedforward amplifiers; mobile communication; W-CDMA test signal; adjacent channel leakage power ratio; feed-forward amplifier; harmonic reaction amplifier; mobile communication systems; output power; Feedforward systems; High power amplifiers; Mobile communication; Multiaccess communication; Operational amplifiers; Power amplifiers; Power generation; Power system harmonics; Signal generators; Testing; feed-forward amplifier; harmonic reaction amplifier; high efficiency; power amplifier;
Conference_Titel :
Radio and Wireless Symposium, 2009. RWS '09. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2698-0
Electronic_ISBN :
978-1-4244-2699-7
DOI :
10.1109/RWS.2009.4957410
