Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1994-02-24
1995-02-14
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
330283, H03G 312
Patent
active
053898966
ABSTRACT:
A variable gain amplifier is provided which includes a transistor amplifier having a first bipolar transistor with a base connected to an input for receiving an input signal. The first transistor has a collector coupled to an output. A parallel feedback path is connected between the collector and the base of the first transistor. A series feedback path is connected to an emitter of the first transistor. The series feedback path has a PIN diode which operates as a variable resistance element and receives a variable gain control signal so as to generate a variable gain. A bias compensation network is connected to the variable resistance element for generating a variable current source that provides current bias to the variable resistance element. In addition, a buffer transistor may be further coupled between the collector of the first transistor and the output to further enhance gain performance. The buffer transistor may be biased through a current source transistor.
Mottola Steven
TRW Inc.
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