Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1989-04-25
1990-07-17
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330284, 358184, H03G 312
Patent
active
049423681
ABSTRACT:
In an amplifier system for a cable-TV converter, the amplifier system having an amplifier having a transistor with a base connected to an input port of the amplifier system that provides a video IF signal and a collector for connection to an output port of the amplifier system, a variable gain device is connected between the collector of the transistor and the output port for varying the gain therebetween. A variable negative feedback device forms a closed loop between the collector and the base of the transistor for varying negative feedback of the variable negative feedback device inversely with the gain of the variable gain device. An impedance matching device is connected between the variable gain device and the output port for maintaining a substantially constant output impedance at the output port.
REFERENCES:
patent: 3613011 (1971-10-01), Wood
Mullins James B.
Samsung Electro-Mechanics Co. Ltd.
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