Abstract:With the designing technology of the self-owned intellectual property right-DAC IP core andhigh-speed circuit, the Neural Network & High Speed Circuit Lab, Institute of Semiconductors, has developed a 2GHz CMOS ROM-Less Direct Digital Frequency Synthesizer (DDS) chip, and meanwhile, the Lab has completed a full range of research on the new type of high resolution DDS chip involving over-sampling Σ/Δ technology. The above work has attracted attention and won high appraisal from IEEE ISCAS 2005 and IEEE VLSI 2005.