可实时更新任意函数和图形波形的发生器IP核设计

基于直接数字频率合成（DDS）原理、可编程片上系统（SoPC）技术和Avalon总线规范，结合软件编程技术，设计了一个通过PC软件可实时产生任意函数表达式波形和人工图形绘制波形的任意波形信号发生器。该信号发生器包括具有独特调制方法及多功能DDS IP核设计、用于通信控制接口的Nios II软件设计和函数波形产生与图形波形编辑的PC软件与界面设计。给出了4种设计波形与实际输出波形的测试验证结果。在该信号发生器运行时，通过PC端上位机软件可十分方便且实时地更新波形，并通过函数方式与图形方式相结合，真正实现任意波形信号的产生。

Design of IP core and arbitrary waveform generator with ability to instantly update functions or plotted waveforms

Based on the direct digital synthesis (DDS) principle, system on a programmable chip (SoPC) technology and Avalon Bus protocol, combined with software technology, an arbitrary waveform generator is designed, which is instantly able to generate any waveform signal made by expression or manual plotting input. The design includes especially modulated DDS of multifunction IP-core, and communication interface software on Nios II platform, and PC software used to produce function waveform and plotted waveform. The results of verification and test about four design waveforms and output waveforms are also given. The arbitrary waveform by the function and plotting mode can be really and easily generated and be instantly updated through PC software.