Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2006-05-02
2006-05-02
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S133000
Reexamination Certificate
active
07038546
ABSTRACT:
A high-power amplification circuit includes a first transistor which amplifies an input signal, a bias circuit which includes a second transistor which is an emitter follower, and supplies a bias current to a base of the first transistor, a constant-voltage power supply connected to the base of the second transistor through a first resistor, a control voltage terminal input one of a first control and a second control voltage, a third transistor including a base connected to the control voltage terminal through a second resistor, a third resistor connected between the base of the second transistor and the collector of the third transistor, and a fourth transistor connected between the base of the second transistor and the third resistor, the fourth transistor being diode-connected.
REFERENCES:
patent: 6236266 (2001-05-01), Choumei et al.
patent: 6407617 (2002-06-01), Yanagihara et al.
patent: 2005/0218992 (2005-10-01), Birkbeck
patent: 2003-58262 (2003-02-01), None
Kabushiki Kaisha Toshiba
Mottola Steven J.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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