Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-03-16
1993-05-11
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330254, 358184, H03G 330, H04N 514
Patent
active
052105040
ABSTRACT:
A semiconductor device for a tuner capable of simultaneously satisfying a low noise factor, low third order distortion characteristics and low power consumption, and a tuner using this semiconductor device for a tuner and capable of reducing the size and eliminating labor during assembly. The semiconductor device is a variable gain amplification circuit comprising a gate grounded circuit using a transistor, and a differential amplification circuit including transistors and constant current sources. Transistors are used as variable resistance devices, and the gain of the gate grounded circuit can be varied by changing the gate voltage of a transistor. The gain of the differential amplification circuit can be varied by changing the gate voltage of another transistor. The overall gain of the circuit can be varied within a necessary range by simultaneously operating these gain controls, and the third order distortion can be improved monotonously with the decrease of the gain.
REFERENCES:
patent: 4209805 (1980-06-01), Ikeda et al.
patent: 4438529 (1984-03-01), Sato
patent: 4459555 (1984-06-01), Jett, Jr.
IBM Technical Disclosure Bulletin, "Bifet Variable Gain Amplifier", vol. 29, No. 11, Apr. 1, 1987, p. 4840.
Kunihisa Taketo
Nakatsuka Tadayoshi
Sakai Yukio
Tsuneoka Michiaki
Yagita Hideki
Matsushita Electric - Industrial Co., Ltd.
Mottola Steven
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