Power amplifier
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United States of America Patent
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Mar 30, 2010
Grant Date -
Dec 17, 2009
app pub date -
Oct 20, 2008
filing date -
Jun 12, 2008
priority date (Note) -
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Abstract
A power amplifier includes: an amplifying transistor; a bias circuit; a first diode; a second diode; a matching attenuating circuit; a first current mirror circuit; a serial resonant circuit, and a switch. In an amplification mode, the bias circuit supplies a bias current to the amplifying transistor, and the first current mirror circuit turns off the first and second diodes, and the switch. In an attenuation mode, the bias circuit supplies no bias current to the amplifying transistor, and the first current mirror circuit turns on the first and second diodes and the switch.
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