基于80C52单片机的函数信号发生器毕业论文.docVIP

基于单片机的信号发生器 摘 要 信号发生器是当今各种电子电路实验中必不可少的仪器设备之一。传统信号发生器通常只有二种主要的控制，可变频率与幅度。这种电路存在波形质失真大、控制难、调节范围小、电路不简单和体积大等缺点。 随着计算机的普及和单片机的应用广泛，二者带动了信号发生器日新月异的变化。单片机产生的信号比传统信号发生器精度更高、频率变换更容易、波形失真度更小。信号发生器是各式各样测试和实验过程中必不可少的仪器，在通信、测量、雷达、控制、教学等领域都有重要应用。不论是在生产、科研还是教学上，信号发生器都是电子工程师信号仿真实验的最佳工具，而且，随着技术的进步，信号发生器的设计方法越来越多，设计技术也越来越先进。比较和研究信号发生器的设计方法，克服传统方法的缺点，设计出更精确，功能更完善的信号发生器是必要的。 本文介绍的是一种用AT89S52单片机构成的信号发生器，可产生方波、三角波、正弦波、锯齿波，波形的频率与幅度可调。具有线路简单、结构紧凑、性能优越等特点。文章给出了源代码，通过仿真测试，其性能指标达到了设计要求。单片机小系统负责用户的交互和系统控制，键盘用于频率的输入与波形的选择。LCD显示当前所选信号的频率调整情况，而末级放大电路则对生成的信号进行适当的放大，以提高信号的振幅和强度。 关键词 单片机，DAC，信号发生器 ,频率调节，幅度调节 Abstract In recent years, with the computer in the social sector penetration and MCU application is continuously, while driving to the deepening traditional function signal generator on new PE updates. SCM can produce high precision, fast transform the frequency, the output waveform distortion of preferred selection technology. Function signal generator is all sorts of test and experiment process the essential tool, in communication, measuring, radar, control, teaching fields used widely. Both in production and scientific research or teaching, signal generator are electronic engineer signal simulation experiment, and the best tool, signal generator design method, design technology is becoming more and more advanced. Research function signal generator design methods, overcome shortcomings of traditional methods, in order to better designed complex FM, attenuation function signal generator. This thesis introduces a AT89C2 single-chip computers.the waveform generator, can produce square-wave, triangle wave, sine wave, sawtooth wave etc. Various waveform, waveform cycle available program change, and can choose according to need single polarity output or dual polarity output, has the line is simple, compact structure, superior performance characteristics. The article presented the source code, through the simulation test, the performance indexes meet the design requirements