毕业论文--基于51单片机的波形发生器设计.doc

本科毕业设计论文 基于51单片机的波形发生器设计 摘 要 波形发生器作为信号源广泛应用于电子工业、自动控制和科学试验等领域。目前国内市场上波形发生器种类匮乏，价格昂贵。为了实验、研究以及工业需要，研制一种功能齐全、使用方便的波形发生器十分重要。 本文介绍了两种基于89C51单片机和数模转换器DAC0832产生所需波形的波形发生器设计方案，两种方案各有特色，可以满足不同领域对波形发生器的需求。其中，程控波形发生器设计方案运用单片机执行程序产生波形数据，再由单片机通过定时器定时控制将波形数据送给DAC转换输出波形，本方案扩展有LED显示模块和键盘模块，具有良好的人机交互性。硬件波形发生器设计中，单片机执行程序产生波形数据或从上位机接受波形数据写入外部RAM中，然后由外部电路控制从RAM中取出波形数据送于DAC转换输出波形，本方案可以产生高频波，且具有良好的可升级性。本次设计的两种方案均能产生频率、幅值可调的正弦波、三角波、锯齿波和方波四种波形。 本次设计运用Keil c软件采用C语言进行软件设计，使用仿真软件Proteus进行系统功能校验，并使用Protel软件制作印刷电路板（PCB）。 本次设计的两种波形发生器具有精度高、误差小、功耗低、数据传输速度快、可靠性高等特点，且具有良好的经济性，具有一定的开发价值。 关键词：波形发生器，单片机，DAC0832，程控波形发生器设计，硬件波形发生器设计 THE DESIGN OF WAVEFORM GENERATOR BASED ON 51 MCU ABSTRACT Waveform generators are widely used in the electronics industry, automatic control and scientific experiments and other fields. Currently, waveform generators, in domestic market, are very limit. So the development of a waveform generator which is fully functional and easy to use is very important for experimental, research, and industrial needs. This article describes two schemes of the design of waveform generator (WG) based on 51 MCU and DAC 0832 chip. And the two schemes have their own advantages to meet different areas’ need. Among them, in the scheme of programmable WG design, we use the MCU to generate waveform data, and then use the timer timing to control DAC converter which translate the waveform data into the output waveform. This scheme expanded with LED display module and keyboard module, which has a good human-machine interaction. In hardware WG design scheme, we use the MCU to generate waveform data or accept the data from PC, and then transfer this data to external RAM. Specially, we use an external circuit to control the DAC conversion. This design can generate high-frequency waves, and it also has good scalability. What’s more, these two schemes can produce four kinds of waveforms (sine, triangle, sawtooth and square wave); their frequency and amplitude can adjust by user’s need. In