| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission circuit capable of operating in low distortion and high efficiency even in a modulation system using a wide band. SOLUTION: A signal generation section 11 generates an amplitude signal M and an angle-modulated signal Sθ. An adaptive compensation filter 12 performs waveform shaping processing for the amplitude signal M in accordance with a magnitude of the amplitude signal M. An amplitude amplification section 14 outputs a signal proportional to a magnitude of the signal subjected to waveform shaping in the adaptive compensation filter 12. An amplitude modulation section 15 amplitude-modulates the angle-modulated signal by the signal outputted from the amplitude amplification section 14 and outputs the resulting signal as a modulated signal. The characteristics of the adaptive compensation filter 12 are inverse characteristics of transfer characteristics between the input of the amplitude amplification section 14 and the output of the amplitude modulation section 15. COPYRIGHT: (C)2009,JPO&INPIT
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