HBT monolithic variable gain amplifier with bias compensation and buffering
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United States of America Patent
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Feb 14, 1995
Grant Date -
N/A
app pub date -
Feb 24, 1994
filing date -
Feb 24, 1994
priority date (Note) -
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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.
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