| 摘要 |
In a first mode in which the power level of a transmission output signal (S 6 ) is to be high, an output from the multiplier ( 2 ) is input to an amplitude modulation signal amplifier ( 4 ), and a radio frequency power amplifier ( 5 ) performs amplitude modulation on a radio frequency phase modulated signal (S 4 ) using a nonlinear area with a supply voltage from the amplitude modulation signal amplifier ( 4 ). In a second mode in which the power level of a transmission output signal (S 6 ) is to be low, the output from the multiplier ( 2 ) is input to a variable gain amplifier ( 7 ), and the variable gain amplifier ( 7 ) performs amplitude modulation on the radio frequency phase modulated signal (S 4 ). The amplitude modulated signal is output without passing through the radio frequency power amplifier ( 5 ).
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