Abstract: The present invention provides a communication apparatus (RFIC) capable of performing a DC offset correction of an orthogonal modulation unit with a degree of accuracy higher than conventional. The orthogonal modulation unit of the RFIC includes first and second mixers, an adder and first and second switches. The first mixer receives a first local oscillation signal therein through the first switch. The second mixer receives a second local oscillation signal therein through the second switch. During calibration, a DC offset of the first mixer is adjusted in a state in which the first switch is brought to an ON state and the second switch is brought to an OFF state. Further, a DC offset of the second mixer is adjusted in a state in which the first switch is brought to an OFF state and the second switch is brought to an ON state.