Communication semiconductor integrated circuit, a wireless communication apparatus, and a loop gain calibration method

A wireless communication apparatus comprising:

• a baseband circuit which generates first signals to be transmitted;
• and
• a transmitter which includes a modulator which modulates the first signals and generates a modulated signal, a phase detector which detects the modulated signal and outputs a phase control signal, an amplitude detector which detects the modulated signal and outputs an amplitude control signal, an oscillator which receives the phase control signal and outputs a transmission signal, a power amplifier which receives the transmission signal and the amplitude signal and outputs an amplified transmission signal, a power detector which detects an output power of the amplified transmission signal, a first amplifier which couples the power detector and the amplitude detector, a second amplifier which couples the amplitude detector and the power amplifier, and a gain controller which instructs gain information to the first amplifier and the second amplifier in accordance with a power instruction signal from the baseband circuit and controls respective gain in mutually opposing directions,
• wherein the transmitter has a register which stores correction data for correcting the variation of the output power characteristic of the power amplifier from the baseband circuit.