Power amplifier and power amplifying method
First Claim
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.
1 Assignment
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Accused Products
Abstract
An aspect of a power amplifier according to the present invention is a power amplifier that amplifies a modulated signal including amplitude modulated components and phase modulated components, the power amplifier including a first voltage source 21 that amplifies low-frequency components of the amplitude modulated components of the modulated signal to output a first voltage VC_L, a second voltage source 22 that amplifies high-frequency components of the amplitude modulated components of the modulated signal to output a second voltage VC_H, a current source 24 that amplifies amplitude components of the modulated signal to output a current, a combiner circuit 23 that combines the first voltage VC_L, the second voltage VC_H, and a current IM to generate a modulated power supply signal VOUT, and an RF amplifier 30 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 VOUT. In this way, power efficiency of a circuit that generates a modulated power supply can be improved.
13 Citations
16 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power amplifier that amplifies a modulated signal including amplitude modulated components and phase modulated components as a transmission signal, the power amplifier comprising:
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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 phase modulated components 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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14. A power amplifying method that amplifies a modulated signal including amplitude modulated components and phase modulated components, the method comprising:
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amplifying low-frequency components of the amplitude modulated components of the modulated signal to output a first voltage; amplifying high-frequency components of the amplitude modulated components of the modulated signal to output a second voltage; amplifying the amplitude modulated components of the modulated signal to output a current; combining the first voltage, the second voltage, and the current to generate a modulated power supply signal, and amplifying a signal obtained by up-converting the modulated signal to a carrier frequency, and outputting the amplified signal after modulating amplitude of the amplified signal by the modulated power supply signal. - View Dependent Claims (15)
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16. A power amplifying method that amplifies a modulated signal including amplitude modulated components and phase modulated components, the method comprising:
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amplifying low-frequency components of the amplitude modulated components of the modulated signal to output a first voltage; amplifying high-frequency components of the amplitude modulated components of the modulated signal to output a second voltage; amplifying the amplitude modulated components of the modulated signal to output a current; combining the first voltage, the second voltage, and the current to generate a modulated power supply signal; and amplifying a signal obtained by up-converting the phase modulated components to carrier frequency, and outputting the amplified signal after modulating amplitude of the amplified signal by the modulated power supply signal.
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Specification