Power amplifier circuit
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United States of America Patent
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-
Jun 30, 2009
Grant Date -
Sep 25, 2008
app pub date -
Aug 6, 2007
filing date -
Mar 23, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a third operation in an amplifier, in which first and second amplifier circuits amplify a input signal, a distribution circuit adjusts the power of the signal supplied to the first amplifier circuit to within a range in which the input power to the first amplifier circuit and the output power from the first amplifier are proportional to each other. In a linear operation, the power of the signal from the first amplifier circuit and input to the comparison circuit and the power of the signal from the second amplifier circuit and input to the comparison circuit are equal. The comparison circuit adjusts the gain or the saturated power of the second amplifier circuit on the basis of the difference between the signals from the first and second amplifier circuits and input to the comparison circuit, so that the input power to the second amplifier circuit and the output power from the second amplifier circuit are proportional to each other.
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