Transmitter and semiconductor integrated circuit for communication

A wireless communication apparatus comprising:

• a base band circuit for generating I and Q signals in accordance with transmitting data;
• a transmitting oscillator for generating a carrier signal;
• a power amplifier for amplifying the carrier signal outputted from the transmitting oscillator;
• a power detector for detecting a power level of a transmitting output signal from the power amplifier;
• and
• a semiconductor integrated circuit for modulation including an orthogonal modulator for modulating the I and Q signals onto the carrier signal so as to form an oscillating signal of a predetermined frequency, a phase control loop which has a phase detector and controls a phase of the carrier signal, and an amplitude control loop which has an amplitude detector and controls an amplitude of the transmitting output signal,
• wherein the phase control loop includes a feedback path for supplying a signal in accordance with an output of the power detector,
• wherein the amplitude control loop includes the feedback path for supplying a signal in accordance with an output of the power detector,
• wherein the amplitude control loop includes the feedback path for supplying the signal in accordance with the output of the power detector, and
• wherein the wireless communication apparatus has a first modulation mode and a second modulation mode, and wherein the phase control loop is shared by the first modulation mode and the second modulation mode.