基于FPGA和MCU的函数波形发生器设计

Design of Functional Waveform Generator based on FPGA and MCU

本文结合直接数字频率合成和现场可编程门阵列器件这两项技术,并利用单片机控制灵活的特点,开发了一种新的函数波形发生器。本文利用FPGA实现DSS模块,用AT89C51来实现系统控制,用高速DA,滤波器和幅值控制电路组成的外围电路部分,并提出了一种准确、程序简单可靠、运行速度快频率控制字计算方法。通过实验说明,本设计达到了预定的要求,并证明了采用软硬件结合,利用DDS技术实现函数波形发生器的方法是可行的。

Combining with the two technologies： direct digital frequency synthesis and FPGA, and using the flexibility control trait of MCU, it designs a new kind of functional waveform generator. This paper uses FPGA to implement DSS module and AT89C51to control system, uses high speed DA, filter and scope control circuit to compound the outer circuit. It also puts forward a precise, credibility and high calculating speed frequent control byte calculating means. Through an experiment, it is testified that the design meets the requirement planed and the way to use software and hardware programming method and DDS technology to realize functional waveform generator is available.