Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1998-08-18
2000-05-02
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including gain control means
330294, H03F 134, H03G 330
Patent
active
060577363
ABSTRACT:
The present invention relates to a gain controlled amplifier, and more particularly, to a gain controlled amplifier using active feedback and variable resistance. It is an object of the present invention to provide a gain controlled amplifier minimizing the gain and the degradation of power characteristics generated when adjusting gain in a variable gain amplifier which receives signals having different power levels, amplifies them in accordance with each power level and outputs output signals in a constant power level. In order to achieve the above object, a gain controlled amplifier in accordance with the present invention comprises an amplifier and an active feedback means for negative feedbacking the output of the amplifier to the input of the amplifier, and further has a feedback amount controller inputting the controlled feedback signal to the amplifier by controlling the feedback amount of said active feedback means.
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An MMIC Low-Distortion Variable-Gain Amplifier Using Active Feedback; Kenjiro Nishikawa and Tsuneo Tokumitsu; 1994; pp. 245-248.
A Linear Limiter: A 11-GHz Monolithic Low Distortion Variable Gain Amplifier; Masahiro Muraguchi and Masayoshi Aikawa; 1991; pp. 525-528.
Kim Min Gun
Lee Chang Seok
Lee Jae Jin
Pyun Kwang Eui
Electronics and Telecommunications Research Institute
Nguyen Khanh V.
Pascal Robert
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