Transmission apparatus, communication apparatus and mobile radio apparatus

A transmission apparatus synthesizing an amplitude component and a phase component using polar modulation and generating and transmitting a vector modulation wave, the transmission apparatus comprising:

• a polar coordinate component modulation signal generating section that forms an amplitude component modulation signal and a phase component modulation signal based on an input signal;
• a delay time adjusting section that changes a delay time difference between the amplitude component modulation signal and the phase component modulation signal;
• a phase modulating section that forms a phase modulation wave where a carrier wave is phase-modulated by the phase component modulation signal;
• an amplifying section that, receiving as input the phase modulation wave at a signal input terminal of the transmission apparatus, with the amplitude component modulation signal applied to a power supply voltage terminal of the transmission apparatus, forms a vector modulation wave where the phase modulation wave is amplitude-modulated by the amplitude component modulation signal;
• a synchronous demodulating section that synchronously demodulates the vector modulation wave and forms a synchronous demodulation signal;
• a band filtering section that extracts and outputs a signal of a specific frequency component contained in the synchronous demodulation signal;
• and
• a controlling section that controls the delay time adjusting section in such a manner that the level of the output signal of the band filtering section becomes small.