POWER AMPLIFIER AND THE RELATED POWER AMPLIFYING METHOD
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United States of America Patent
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Issued Date -
Apr 24, 2014
app pub date -
Jun 3, 2013
filing date -
Oct 18, 2012
priority date (Note) -
Abandoned
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Abstract
A power amplifier includes: a plurality of amplifying stages arranged to generate an output signal at an output terminal according to a phase-modulated signal and a plurality of amplitude-modulated signals, where each amplifying stage is arranged to receive the phase-modulated signal and one of the plurality of amplitude-modulated signals; an inductive circuit coupled between the output terminal and a first reference voltage; a matching circuit coupled between the output terminal and a loading circuit for providing a matching impedance between the output terminal and the loading circuit; and a capacitive circuit coupled to the output terminal for providing an adjustable capacitance to adjust a loading capacitance at the output terminal according to an adjusting signal; wherein the adjusting signal is indicative of a power of the output signal.
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