A digital wireless transmitter is provided. The digital wireless transmitter includes a serial-to-parallel converter, a delta-sigma modulator (DSM), and a radio frequency (RF) converter. The serial-to-parallel converter is configured to interpolate a serial digital input signal and to output N parallel signals, where N is a positive integer greater than one. The DSM is configured to perform delta-sigma modulation on the N parallel signals in parallel. The RF converter is configured to arrange N delta-sigma modulated signals into K parallel signals, to delay the K parallel signals by different delay times, and to convert delayed signals into an RF signal, where K is a positive integer greater than N.