Patent ID: 7433653

Claim:
A mobile phone which has a first communication function and a second communication function comprising: an antenna; a base band circuit; a reception circuit which is coupled to the antenna and the base band circuit and which includes a mixer for converting a reception signal into a base band signal, a transmission circuit including an orthogonal modulator which modulates I and Q signals from the base band circuit to a first signal to be transmitted; a transmitting oscillator which generates a transmitting signal based on the first signal; a power module which is coupled to the antenna and the transmitting oscillator and which includes a power amplifier for amplifying the transmitting signal and a power detector for detecting a power level of an output signal from the power amplifier to be transmitted; a phase control loop which has a phase detector and controls a phase of the transmitting signal, and an amplitude control loop which has an amplitude detector and controls an amplitude of the output signal from the power amplifier, 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 first communication function is a phase modulation mode using the phase control loop, wherein the second communication function is a phase and amplitude modulation mode using both of the phase control loop and the amplitude control loop, and wherein the phase control loop is shared by the first communication function and the second communication function.