Patent ID: 8670728
Filing Date: 2014-03-11
Classification: H03F,H04B

Abstract:
1. A phase correction apparatus in a wireless transmitter for converting a first signal into a wireless signal and amplifying the wireless signal by a power amplifier, the phase correction apparatus comprising: a quadrature modulator configured to modulate an in-phase component and a quadrature component of the first signal by a first carrier wave signal; a quadrature demodulator configured to demodulate a returned signal returned from an output of the power amplifier by a second carrier wave signal, and generate a second signal that includes an in-phase component and a quadrature component; a phase detector configured to binarize the in-phase components and the quadrature components of the first and second signals according to signal levels including comparing each of the in-phase components and the quadrature components to a respective predetermined threshold value, and detect a phase error between the first signal and the second signal based on combinations of the binarized signal components in the first signal and the second signal; and a phase shifter configured to phase-shift the first signal, the second signal, the first carrier wave signal, or the second carrier wave signal, based on the phase error, wherein the phase detector includes a memory that stores information indicating whether to increase, decrease, or keep a sine value of the phase error, in accordance with combinations of the binarized signal components in the first signal and the second signal, and the phase detector continuously updates the sine value of the phase error by referencing the memory based on the continuously binarized signal components in the first signal and the second signal, respectively.