| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a transmission circuit which accurately adjusts a delay time difference between amplitude signals and phase signals without widening a circuit structure for broadband processing, and to provide a communication device using the transmission circuit. Ž<P>SOLUTION: The transmission circuit includes a signal generator which generates amplitude signals and frequency signals based on amplitude components and phase components that are obtained by the signal processing of data, an angle modulator which angle-modulates the frequency signals, a delay time adjuster which adjusts a delay time of the amplitude signals, an amplitude amplifier which outputs signals corresponding to magnitudes of amplitude signals the delay time of which is adjusted, an amplitude modulator which amplitude-modulates the signals output from the angle modulator by using the signals output from the amplitude amplifier to output them as modulation signals, and a delay processing circuit which calculates a delay time difference between the amplitude signals and the frequency signals from the modulation signals, and feedback-controls the delay time adjusted by the delay time adjuster until the delay time difference becomes zero only during a predetermined test period. The signal generator outputs sinusoidal signals as amplitude signals and frequency signals during the predetermined test period. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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