Variable gain amplifier circuit
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United States of America Patent
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May 20, 2014
Grant Date -
Aug 16, 2012
app pub date -
Jan 26, 2012
filing date -
Feb 15, 2011
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Abstract
A variable gain amplifier circuit with a small-sized configuration can accurately adjust the gain without causing a transmission loss of an input signal. A plurality of amplification portions are connected with each other between an amplification coupling line and a grounding line in parallel. The amplification portion includes a switching device and an amplification transistor, which induces a current corresponding to an input signal to flow between the amplification coupling line and the grounding line via the switching device when the switching device is in the on state. The amplitude gain is varied by, according to a gain control signal, separately switching on and off the switching devices of the respective amplification portions.
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