Digital if wireless transmitter, rf modulator, and rf modulating method

Abstract

Provided are a digital IF wireless transmitter, an RF modulator, and an RF modulating method. A digital IF wireless transmitter includes an IF up-converting unit up-converting a baseband I signal and a baseband Q signal on the basis of a first IF, a first operating unit subtracting the first IF-up-converted I signal and the first IF-up-converted Q signal, a D/A converting unit analog converting an output signal of the first operating unit, an IF modulating unit separating the same first and second signals from the output signal of the D/A converting unit, and modulating the first and the second signals on the basis of a second IF, a high-pass filtering unit passing a single sideband of the modulated first signal, a miss-matching correcting unit correcting an error of the modulated second signal, a second operating unit subtracting an output signal of the high-pass filtering unit and an output signal of the miss-matching correcting unit, a feedback unit receiving a feedback signal output from the second operating unit, detecting an error of the feedback signal, and providing the detected error to the miss-matching correcting unit, and an RF up-converting unit up-converting the output signal of the second operating unit on the basis of an RF.