基于FPGA的DDS函数发生器的设计与实现

Design and Implementation of DDS Function Generator Based on FPGA

论述了利用FPGA的系统级设计工具DSP Builder开发DDS函数发生器的总体设计思路,讨论了改变输出信号频率、幅度、相位的设计方法。系统基于Altera公司的Cyclone系列FPGA,配合Silicon Labs公司高性能C8051F340单片机实现,给出了系统的软件仿真结果并完成了整个系统的硬件验证。结果证明了设计的正确性,同时表明采用DSPBuilder使DDS任意函数发生器的FPGA硬件实现更加简单,速度更快。

In this paper,the design considerations of a DDS（Direct Digital Synthesizer） function generator with DSP Builder,including the method of changing frequency,amplitude and phase of output signal,are introduced.This system is mainly controlled by FPGA of Alter,and it is also assisted by micro-processor C8051F340.The results of software simulation of the system are given and hardware verification of the whole system is completed.The results prove that the design is correct,and show that the use of DSP Builder is simpler and faster to implement the DDS function generator.