| 摘要 |
A power supply device capable of suitably reducing a loss even in a case where power is supplied to an output device which outputs a high-frequency signal, a signal output apparatus in which a loss is suitably reduced, and a power supply method capable of suitably reducing a loss. The power supply device has a power supply section which supplies a power supply voltage to an output device which is supplied with the power supply voltage and outputs an output signal, and a voltage control section which controls the power supply section so that the power supply voltage follows the envelope of the output signal from the output device.
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