Design of Signal Generator Based on DDS Technology

Abstract

Traditional signal generators use analog oscillator circuit as the source, which often involve multiplication, integral and differential circuit. As this method required high electrical parameters of the system, and its complex circuit structure is vulnerable to outside interference. In this paper, a new technology named Direct Digital Synthesizer, DDS technology, was applied on a FPGA chip to design a waveform generator. It can generate periodic waveform, and its frequency, phase and amplitude were adjustable. Simultaneously, DDS technology has the function of frequency and phase adjustment, so no additional circuit was needed. During the amplitude modulation design, the characteristics of reference voltage of the D/A Converter are used. The theoretical and experimental results show that the combination of DDS technology and FPGA can well generate the periodic signal waveforms, while the hardware system fabricated has strong capability of anti-jamming.