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利用FPGA芯片及D/A转换器,采用直接数字频率合成技术,设计实现了一个频率、相位可调的正弦信号发生器,同时阐述了频率合成技术及直接数字频率合成(Direct Digital Frequency Synthesis,简称:DDS)技术的原理、电路结构,及设计思路和实现方法,最后简要探讨了抑制DDS杂散和噪声的方法。经过设计和电路测试,输出波形达到了技术要求,控制灵活、性能也好,也证明了基于FPGA的DDS设计的可靠性和可行性。
By using direct digital frequency synthesizer and FPGA chip and D / A converter, a sinusoidal signal generator with adjustable frequency and phase is designed and realized. At the same time, the frequency synthesizing technology and Direct Digital Frequency Synthesis : DDS) technology principle, circuit structure, design ideas and implementation methods, and finally briefly discussed the method of suppressing DDS spurious and noise. After the design and circuit testing, the output waveform to meet the technical requirements, flexible control, performance is also good, but also proved the FPGA-based DDS design reliability and feasibility.