基于FPGA的DDS信号源研究与设计

Research and design of DDS signal source based on FPGA

可编程逻辑器件FPGA具有便于编程、开发周期短、集成度高、功能强大、开发工具智能化、保密性好等特点,被广泛应用于通信及数字设计等领域。将DDS技术和FPGA器件相结合,采用加扰方法,利用HDL语言和原理图设计了一种基于FPGA的DDS信号源,它不仅能产生正(余)弦波、三角波、锯齿波、方波等常见波形信号,而且还能产生调频信号、调幅信号等调制信号以及扩频信号。实验结果表明,该设计电路稳定性好,能够使DDS电路在精确度与灵活性方面得到很大提高。

Programmable logic device FPGA has the characteristics of easy programming,short development cycle,high integration,powerful function,intelligent development tools,good security and so on. It is the first choice for hardware design. It is widely used in communication and digital designs. With the advantages of DDS and FPGA and based on FPGA HDL,a DDS based signal source is designed,which can accomplish the signal of sine（ cosine） wave,triangle wave,zigzag wave,square wave and so on. The experimental results showthat the stability of the design circuit is good,and the DDS circuit can be greatly improved in accuracy and flexibility.