Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1995-08-11
1997-08-26
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
330294, H03G 330, H03F 134
Patent
active
056614373
ABSTRACT:
A variable gain amplifier circuit in which a feedback circuit that feeds back the output signal of an amplifier from its output terminal to its input terminal is composed of an FET. The gate terminal of the feedback FET is connected to the output terminal of the amplifier through a capacitor, and the source terminal of the feedback FET is connected to the input terminal of the amplifier. The gain of the amplifying circuit is controlled by varying the transconductance of the feedback FET by controlling a bias voltage applied to the gate or drain terminal of the feedback FET. This makes it possible to control the gain independently of the physical dimension of the feedback FET, and at the same time, to prevent the input signal from being transmitted from the input side to the output side through the feedback circuit.
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patent: 5371477 (1994-12-01), Ikeda et al.
Ishihara et al; "9GHz Bandwidth, 8-20dB Controllable-Gain Monolithic Amplifier . . . "; Electronics Letters, vol. 25, No. 19, Sep. 14, 1989, pp. 1317-1318.
Nishikawa et al; "An MMIC Low-Distortion Variable-Gain Amplifier . . . "; 1994 Asia Pacific Microwave Conference; pp. 245-248.
Nishikawa et al; "An MMIC Low-Distortion Variable-Gain Amplifier . . . "; 1995 IEEE MTT-S Digest; pp. 1619-1622.
Nishikawa Kenjiro
Tokumitsu Tsuneo
Mottola Steven
Nippon Telegraph and Telephone Corporation
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