Radio communication terminal
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United States of America Patent
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Mar 3, 2009
Grant Date -
Mar 9, 2006
app pub date -
Sep 2, 2005
filing date -
Sep 3, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A radio communication terminal has a plurality of matching circuits that optimize the efficiency of a power amplifier for a range of different battery voltages. A first matching circuit optimizes the efficiency of the power amplifier for a battery voltage higher than a predetermined threshold value. A second matching circuit optimizes the efficiency of the power amplifier at a voltage lower than the threshold value. A control section compares a detection result of a battery voltage from a voltage monitor section with the threshold value, and performs switching between the plurality of matching circuits.
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