Title:
増幅器
Document Type and Number:
Japanese Patent JP4792273
Kind Code:
B2
Abstract:
A first control unit controls a bias applied to the peak amplifier to (a) make a peak amplifier operate as class C when the level of the input signal is lower than a first threshold value, to (b) make the peak amplifier operate as class AB with a second conduction angle substantially equal to a first conduction angle, when the level of the input signal is higher than a second threshold value higher than the first threshold value, and to (c) make the peak amplifier operate as class AB with a third conduction angle smaller than the first conduction angle, when the level of the input signal is not less than the first threshold value and not more than the second threshold value.
Inventors:
Yoichi Okubo
Yasuhiro Takeda
Manabu Nakamura
Naoki Motoe
Masaru Adachi
Yasuhiro Takeda
Manabu Nakamura
Naoki Motoe
Masaru Adachi
Application Number:
JP2005303093A
Publication Date:
October 12, 2011
Filing Date:
October 18, 2005
Export Citation:
Assignee:
Hitachi Kokusai Electric Co., Ltd.
International Classes:
H03F1/07; H03F1/02; H03F1/32; H03F3/60; H03G3/30
Domestic Patent References:
| JP6125230A | ||||
| JP5251951A | ||||
| JP2003338711A |
Foreign References:
| WO2004088837A1 |
Attorney, Agent or Firm:
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto