Modeling and Simulation of Period Signal Generator Based on DDS Technology

Abstract

A new technology named Direct Digital Synthesizer, DDS technology, was applied on a FPGA chip to design a signal generator which can produce periodic waveforms, and its frequency, phase and amplitude were all adjustable. Since the DDS technology has the function of frequency and phase adjustment, no additional circuits are needed in design. The theoretical model was built and the programs for each module were well developed. Using Modelsim software, three signal waveforms were simulated corresponding to sine, triangle, and square signals. The theoretical and simulation results show that the combination of DDS technology and FPGA can generate arbitrary waveforms in theory, while the hardware system fabricated has strong capability of anti-jamming.