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Power amplifier and power amplifying method

  • US 8,620,240 B2
  • Filed: 01/27/2010
  • Issued: 12/31/2013
  • Est. Priority Date: 02/05/2009
  • Status: Active Grant
First Claim
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1. A power amplifier that amplifies a modulated signal including amplitude modulated components and phase modulated components, the power amplifier comprising:

  • a first voltage source that amplifies low-frequency components of the amplitude modulated components of the modulated signal to output a first voltage;

    a second voltage source that amplifies high-frequency components of the amplitude modulated components of the modulated signal to output a second voltage;

    a current source that amplifies the amplitude modulated components of the modulated signal to output a current;

    a combiner circuit that combines the first voltage, the second voltage, and the current to generate a modulated power supply signal; and

    an RF amplifier that amplifies a signal obtained by up-converting the modulated signal to a carrier frequency and outputs the amplified signal after modulating amplitude of the amplified signal by the modulated power supply signal.

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