Patent ID: 8306487

Claim:
A phase corrector in a radio transmitter which converts a first signal into a radio signal and amplifies the radio signal by a power amplifier, the phase corrector comprising: a quadrature modulator which modulates a first carrier signal by using an in-phase component and a quadrature component of the first signal; a quadrature demodulator which demodulates a feedback signal fed back from an output of the power amplifier by using a second carrier signal to generate a second signal including an in-phase component and a quadrature component; a phase detector which detects a phase error between the first signal and the second signal based on the in-phase components and the quadrature components of the first signal and the second signal; and a phase shifter which performs phase shift of any one of the first signal, the second signal, the first carrier signal and the second carrier signal based on a sum value obtained by adding to the phase error a first phase amount varying on a time base in a given phase range.