Patent ID: 7564921
Filing Date: 2009-07-21
Classification: H03M,H04B,H04L

Abstract:
1. A direct current (DC) offset correction apparatus modulating by using a baseband signal and a reference signal that is the result of giving an appropriate delay to the baseband signal, feeding back a signal amplified by an amplifier, generating a demodulated feedback signal and correcting a DC offset of a transmission signal, comprising: a signal state evaluation unit for evaluating a state of a transmitted signal by examining the reference signal; and a DC offset correction unit for selecting, on the basis of the result of evaluating the signal state, either a first method for correcting the DC offset of a transmission signal by using only the demodulated feedback signal or a second method for correcting the DC offset of the transmission signal by using both the reference signal and the demodulated feedback signal, and correcting the DC offset of the transmission signal.