基于单片机的波形发生器_毕业设计论文.doc

PAGE 2 毕业设计（论文） 题 目：基于单片机的波形发生器 英文题目：Waveform generator based on MCU 专 业： 电子信息工程 二零一二年六月 PAGE II 摘 要 随着电子测量技术与计算机技术的精密结合一种新的信号发生器便产生了，即任意波形发生器应运而生，所谓任意波形发生器是能够产生大量的标准信号和用户定义信号，并保证高精度、高稳定性、可重复性和易操作性的电子仪器，因而它具有广阔的应用前景。 这种基于单片机的波形发生器是以AT89S52单片机为控制核心，利用内部自带的计数器/定时器产生方波，并由用户通过小键盘选择波形周期。与8位数模转换器DAC0832将数字量转化为模拟电压信号，通过运放进行波形调整得到三角波、正弦波等各种波形信号，波形保证了它的精度和平滑，最后通过LCD显示波形代号。 波形频率的改变可通过键盘输入，通过不同键盘的操作来改变其波形频率的改变以及不同波形之间的切换。 该波形发生器产生的信号干扰小，输出稳定，可靠性高，特别是操作简单方便，成本低，非常适合于物理实验室教学与实验使用。 关键词：AT89S52单片机； DAC0832； LCD ABSTRACT With electronic measurement technology and the sophisticated computer technology, a new signal generator creates, Arbitrary waveform generator that emerged, The so-called arbitrary waveform generator will be able to produce a large number of standard and user-defined signal, and to ensure high-accuracy, high-stability, repeatability and easy to operate electronic devices, thus it has broad application prospects. On the subject of a microcontroller based on the waveform generator, AT89S52 to control the core, Taking advantage of its internal built-in counter/timer produce square. By the user through small keyboard choice waveform cycle, Microprocessor compatible with the eight DAC0832 Digital to Analog conversion to digital simulation for the current signal the conversion circuit to be sawtooth and sinusoidal signal waveform ensure by LCD it is accuracy and smoothness. The frequency waveform can be changed by keyboard input. Through different keyboard to change its operating frequency of the waveform change and to switch between the different waveforms. The waveform generator small signal interference, output stability, high reliability, in particular operation simple and convenient, low-cost, very suitable for teaching in the physics laboratory and experimental use. Key words ：AT89S52 SCM； DAC0832； LCD 目 录 TOC \o 1