AMPLIFIER CIRCUIT
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United States of America Patent
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app pub date -
Sep 24, 2007
filing date -
Mar 23, 2005
priority date (Note) -
Abandoned
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Abstract
An amplifier circuit is provided for amplifying an input signal with a vertically integrated cascode. The cascode comprises a collector semiconductor region of a collector, a first base semiconductor region, adjacent to the collector semiconductor region, of a first base, a second base semiconductor region of a second base, an intermediate base semiconductor region adjacent to both the first base semiconductor region and the second base semiconductor region, and an emitter semiconductor region, adjacent to the second base semiconductor region, of an emitter. A signal input is connected to the second base and the first base is connected via a network to the second base in such a way that a small signal voltage at the first base is coupled to a small signal voltage at the second base and/or a small signal current through the second base.
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