Variable gain amplifying circuit with matchable input/output...

Details Variable gain amplifying circuit with matchable input/output... Variable gain amplifying circuit with matchable input/output...

2008-07-08

2008-07-08

Trinh, Sonny (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S136000, C455S138000

Reexamination Certificate

active

11271244

ABSTRACT:
A variable gain amplifying circuit includes a gate-grounded amplifying FET and a collector-grounded amplifying transistor. A gate voltage of the FET and a base voltage of the transistor are adjusted by a supplied AGC voltage. When an input RF signal has small amplitude, the gate voltage is increased by a high AGC voltage so as to increase a main current of the FET, thereby increasing a signal gain of the FET. When the input RF signal has large or medium amplitude, the gate voltage is decreased by a low AGC voltage so as to decrease a main current of the FET, thereby decreasing the signal gain of the FET.

REFERENCES:
patent: 4208741 (1980-06-01), Brun et al.
patent: 4379269 (1983-04-01), Ijichi
patent: 5210504 (1993-05-01), Yagita et al.
patent: 6037999 (2000-03-01), Kunishima
patent: 6118499 (2000-09-01), Fang
patent: 6566953 (2003-05-01), Yamamoto
patent: 6904271 (2005-06-01), Yamamoto
patent: 7019790 (2006-03-01), Yamamoto
patent: 7023275 (2006-04-01), Miyamoto
patent: 7187913 (2007-03-01), Rahn et al.
patent: 7248107 (2007-07-01), Brekelmans et al.
patent: 7298426 (2007-11-01), Yamamoto
patent: 7352238 (2008-04-01), Elwan et al.
patent: 11-220342 (1999-08-01), None
patent: 2001-036360 (2001-02-01), None

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