APPARATUS FOR UPCONVERTING A DIGITAL RADIO FREQUENCY CAPABLE OF PREVENTING THE PERFORMANCE DETERIORATION OF AN ANALOG DEVICE, IMPOSSIBILITY OF INTEGRATION, AND USER INCONVENIENCE

摘要

PURPOSE: An apparatus for upconverting a digital radio frequency is provided to receive a signal without noise when compared to using an analog device by developing a small wireless telecommunication device and broadcasting device using a wideband frequency.;CONSTITUTION: A receiving unit(210) changes a baseband digital signal into an in-phase signal and a quadrature signal. A digital pulse shaping filter(220) limits a frequency band by changing the symbol of an inputted signal into a specific shaped waveform. A quadrature modulator(240) is composed of an NCO(Numerical Controlled Oscillator), two multipliers, and an adder. A first interpolation unit(230) performs interpolation for increasing a sample rate of a Q signal and an I signal. A DAC(Digital-Analog Converter)(260) changes a digital signal modulated by the quadrature modulator into a broadband RF(Radio Frequency) signal.;COPYRIGHT KIPO 2012