APPARATUS AND METHOD FOR CONVERTING DIGITAL SIGNAL TO RADIO FREQUENCY SIGNAL DIRECTLY

摘要

PURPOSE: An apparatus and a method for directly changing a digital signal into a radio frequency signal are provided to embody DAC, an image filter, and a mixer in one chip. CONSTITUTION: A DAC(Digital-Analog Converter)(320) changes a different phase digital signal into an analog signal. An image filter(330) removes a frequency band in which generation of an image signal is expected in the mixing of an oscillation frequency and an analog signal. A mixer(340) changes the signal from which the frequency band is removed into a radio frequency band. The DAC, image filter and mixer are integrated in one chip. The image-removed filter comprises a switch for controlling the removed frequency band.