Transmitter
First Claim
1. A transmitter, comprising:
- a modulation wave signal generation unit that generates a modulation wave signal;
a phase/amplitude separation unit that separates the modulation wave signal generated by the modulation wave signal generation unit into a phase component and an amplitude component;
a first voltage conversion unit that outputs a predetermined voltage with respect to the amplitude component and varies the output voltage from a minimum value to a maximum value in accordance with a variation of the amplitude component from a minimum value to a maximum value;
a second voltage conversion unit that outputs a predetermined voltage with respect to the voltage output from the first voltage conversion unit;
a frequency conversion unit that converts the phase component output from the phase/amplitude separation unit into a frequency to be transmitted; and
a high-frequency power amplifier, in which an output signal of the frequency conversion unit is supplied to a high-frequency input terminal, the output voltage of the first voltage conversion unit is applied to a base terminal or a gate terminal, and the output voltage of the second voltage conversion unit is applied to a collector terminal or a drain terminal, the high-frequency power amplifier outputting a modulated wave in which an amplitude and a phase are multiplied with each other.
1 Assignment
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Accused Products
Abstract
In a range (R3) in which an amplitude component voltage (VA) of a modulation wave signal from an OFDM signal generation unit corresponds to the average output power, an output voltage of a first voltage conversion unit (voltage applied to a base or a gate) is fixed, thus allowing the class AB operation of a high-frequency power amplifier. In a range (R4) in which VA is larger than that in R3, the output voltage of the first voltage conversion unit is increased, thus varying the operating class of the high-frequency power amplifier from class AB to class A. In a range (R2) in which VA is smaller than that in R3, the output voltage of the first voltage conversion unit is decreased, thus varying the operating class of the high-frequency power amplifier from class AB to class B. The efficiency at the time of the average power can be improved without degrading the maximum output power of the high-frequency power amplifier included in a transmitter.
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Citations
6 Claims
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1. A transmitter, comprising:
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a modulation wave signal generation unit that generates a modulation wave signal;
a phase/amplitude separation unit that separates the modulation wave signal generated by the modulation wave signal generation unit into a phase component and an amplitude component;
a first voltage conversion unit that outputs a predetermined voltage with respect to the amplitude component and varies the output voltage from a minimum value to a maximum value in accordance with a variation of the amplitude component from a minimum value to a maximum value;
a second voltage conversion unit that outputs a predetermined voltage with respect to the voltage output from the first voltage conversion unit;
a frequency conversion unit that converts the phase component output from the phase/amplitude separation unit into a frequency to be transmitted; and
a high-frequency power amplifier, in which an output signal of the frequency conversion unit is supplied to a high-frequency input terminal, the output voltage of the first voltage conversion unit is applied to a base terminal or a gate terminal, and the output voltage of the second voltage conversion unit is applied to a collector terminal or a drain terminal, the high-frequency power amplifier outputting a modulated wave in which an amplitude and a phase are multiplied with each other. - View Dependent Claims (2, 3)
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4. A transmitter, comprising:
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a modulation wave signal generation unit that generates a modulation wave signal;
an amplitude component generation unit that generates an amplitude component from the modulation wave signal generated by the modulation wave signal generation unit;
a first voltage conversion unit that outputs a predetermined voltage with respect to the amplitude component and varies the output voltage from a minimum value to a maximum value in accordance with a variation of the amplitude component from a minimum value to a maximum value;
a second voltage conversion unit that outputs a predetermined voltage with respect to the voltage output from the first voltage conversion unit;
a frequency conversion unit that converts the modulation wave signal output from the modulation wave signal generation unit into a frequency to be transmitted; and
a high-frequency power amplifier, in which an output signal of the frequency conversion unit is supplied to a high-frequency input terminal, the output voltage of the first voltage conversion unit is applied to a base terminal or a gate terminal, and the output voltage of the second voltage conversion unit is applied to a collector terminal or a drain terminal, the high-frequency power amplifier outputting a modulated wave in which an amplitude and a phase are multiplied with each other. - View Dependent Claims (5, 6)
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Specification