Amplifier circuit and wireless communication device
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United States of America Patent
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Feb 23, 2010
Grant Date -
Oct 30, 2008
app pub date -
Apr 25, 2008
filing date -
Apr 25, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
An amplifier circuit has a current conversion circuit that receives a high frequency signal and produces a signal current according to the high frequency signal; a gain control circuit that includes a control signal input for receiving a control signal, a first output, and a second output, and produces the signal current from the first output or the second output according to the control signal; an impedance circuit that includes a first node connected to the first output, a second node connected to the second output, and a third node, the impedance circuit presenting a predetermined impedance between the nodes; a switch circuit that is inserted between the first output and the first node; and a load impedance unit that is connected to the first output and produces a gain signal representing an amplified high frequency signal.
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