Tetsuo Hirota
NTT DoCoMo
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Publication
Featured researches published by Tetsuo Hirota.
international microwave symposium | 2003
Yasunori Suzuki; Tetsuo Hirota; Toshio Nojima
A new feed-forward amplifier configuration is proposed that uses a Doherty amplifier with Class-F operation as the main amplifier. Due to the new configuration, the enhanced main amplifier operates well with less output back-off and achieves high efficiency under Class-F operation compared with Class-B amplifier (non Doherty amplifier). A 2-GHz band 1-W class feed-forward amplifier is investigated. A back-off improvement of 3 dB is experimentally achieved compared with a conventional feed-forward amplifier for the same intermodulation distortion level. The efficiency of the main amplifier is also improved from 33% to 52% when third-order intermodulation distortion of feed-forward amplifier is - 50 dB. The proposed technique can effectively reduce the power consumption of the power amplifiers for cellular base stations.
Archive | 2004
Yasunori Suzuki; Shinji Mizuta; Tetsuo Hirota; Yasushi Yamao
Archive | 2003
Yasunori Suzuki; Shinji Mizuta; Tetsuo Hirota; Yasushi Yamao
Archive | 2004
Hiroshi Okazaki; Tetsuo Hirota; Atsushi Fukuda
Archive | 2000
Yasunori Suzuki; Tetsuo Hirota; Toshio Nojima
Archive | 2001
Yasunori Suzuki; Tetsuo Hirota; Toshio Nojima
Archive | 2005
Kei Satoh; Shoichi Narahashi; Tetsuo Hirota; Yasushi Yamao
Archive | 2000
Yasunori Suzuki; Tetsuo Hirota; Toshio Nojima
Archive | 2001
Yasunori Suzuki; Tetsuo Hirota; Toshio Nojima
Archive | 2007
Kunihiro Kawai; Daisuke Koizumi; Kei Satoh; Shoichi Narahashi; Tetsuo Hirota
