| 摘要 |
A transmitting apparatus of the present invention includes an orthogonal modulator for generating a modulated signal by using an input signal; a polar-modulation-mode transmission circuit which includes a first power amplifier whose input terminal receives a phase component of the modulated signal generated by the orthogonal modulator and whose power supply terminal receives an amplitude component of the modulated signal generated by the orthogonal modulator, and which polar-modulates the modulated signal; an orthogonal-modulation-mode transmission circuit which includes a second power amplifier whose input terminal receives the modulated signal generated by the orthogonal modulator and whose power supply terminal receives a constant voltage, and which transmits the modulated signal; and a switch for connecting an output of the orthogonal modulator with an input of the polar-modulation-mode transmission circuit at the time of a high output, and for connecting the output of the orthogonal modulator and an input of the orthogonal-modulation-mode transmission circuit at the time of an low output.
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