关键词：认知无线电；欠采样率；数字模拟转换器；DAC
摘 要：This work demonstrates a proof-of-concept design of sub-Nyquist rate conversion and wideband direct synthesis using image spectrum.This work also presents the implementation of a 600MS/s 10-bit multi-mode sub-Nyquist rate DAC that enables wideband direct waveform synthesis for TV band cognitive radio transmitters.