可编程信号发生器设计与实现分析.doc

可编程信号发生器设计与实现 摘要：信号发生器是一种常见的信号源，在生产实践、科技领域和教学方面都有着广泛的应用。由分立元件组成的信号发生器，电路结构较复杂，产生波形种类少，电参数调节不精确；利用单片机，采用软硬件结合设计的信号发生器，具有电路结构简单、性能稳定、价格便宜等优点，具备一定的研究价值。 本设计采用STC89C52单片机为系统核心，内部写入波形程序，外部接DAC0832数模转换器进行数模转换，再通过运放电路处理后输出波形。本次设计成果能产生三种基本波形（正弦波、方波和三角波），三种波形通过按键切换，波形频率通过数码管显示，通过频率加减键可实现频率的改变，并且波形幅度可调。本设计的可编程性体现在可以灵活的对单片机内部程序进行修改和拓展。总体来看，本设计电路简单、布局合理、软件功能强大，整体上达成了预想效果。 关键词：信号发生器；STC89C52； DAC0832；运放；可编程 中图分类号：TN41 The Design and Implementation of Programmable?Signal Generator Abstract: The signal generator is a common source of signal, in the field of production practice, science and technology and teaching have a wide range of applications. By the signal generator of the discrete component, the circuit structure is complex, the waveform is less and the electric parameters are not adjusted; the signal generator with the combination of hardware and software with the use of single-chip microcomputer, with the advantages of simple circuit, stable performance and cheap price, etc, have a certain research value. The design used STC89C52 microcontroller as the core of the system, the waveform program was deposited in the microcontroller, connected DAC0832 d/a converter to convert digital to analog, then through the op-amp circuit output waveform after processing. The design results can produce three basic waveforms(sine wave, square wave and triangular wave), three waveforms switch by button, frequency of the waveform through a digital tube display, it can be achieved through frequency plus and minus keys to change the frequency, and waveform amplitude can be adjusted. The design of the programmable embodied in the flexibility of single chip microcomputer internal procedures to modify and expand. Overall, the design of simple circuit, reasonable layout, powerful software, as a whole to achieve the expected effect. Keywords: Signal Generator; STC89C52; DAC0832; Operational Amplifier ; Programmable. Classification: TN41 目 次 摘要 I 目次 III 1 绪论 1 1.1 研究背景和意义 1