| 摘要 |
A power amplifier is provided with a signal generating circuit, a plurality of control signal amplifiers and an RF amplifier. The signal generating circuit outputs the amplitude modulation components of an input signal by dividing the components into a plurality of control signals, and outputs a modulation wave signal or the phase modulation components of the modulation wave signal. The control signal amplifier is provided with a pulse modulator, which performs pulse modulation of a control signal; a switching amplifier, which performs current amplification of a rectangular wave signal outputted from the pulse modulator; and a low-pass filter, which removes spurious components from the signal outputted from the switching amplifier. The RF amplifier amplifies the inputted signal, performs amplitude modulation with the signal outputted from the low-pass filter and outputs the amplitude-modulated signal.
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