基于VHDL的多种波形发生器的设计_毕业设计论文.doc

基于VHDL的多种波形发生器的设计 摘 ?要 本系统是基于AT89C51单片机的数字式低频信号发生器。采用AT89C51单片机作为核心控制，外围采用数字/模拟转换电路（DAC0832），运放电路（LM324），按键和8位数码管等。通过按键控制可产生方波，正弦波，三角波等，同时用数码管指示其对应的频率。其设计简单，性能好，可用在多种需要低频信号的场所，具有一定的实用性。 各种各样的信号是通信领域的重要组成部分，其中正弦波，方波和三角波是比较常用的信号。在科学研究和教学实验中常常需要这几种信号的发生装置。为了实验，研究方便，研制一种灵活实用，功能齐全，实用方便的信号源是十分需要的。 本文介绍的是利用AT89C51单片机和数模转换器件DAC0832产生所需不同的低频信号源，其信号幅度和频率都是可以按要求控制的。文中简要介绍了DAC0832数模转换器的结构原理的使用方法，AT98C51的基础理论，以及与设计有关的各种有关的芯片。文中着重介绍了如何利用单片机控制D/A转换器产生上述信号弹的硬件电路和软件编程。信号频率幅度也按要求可调。 本次关于产生不同低频信号的信号源是设计方案，不公在理论的实践上都能满足实验的要求，而且具有很强的可行性。该信号源的特点是：体积小，价格低廉，性能稳定，实现方便，功能齐全。 关键词：AT89C51 DAC0832 LM324 8位数码管显示 Abstract Waveform The system is a digital generator based on single chip computer.At89c51 is used as a composed by digtal/analog comversion(DAC0832),imply circuit button and nixie. It can be used for a signal soure in the low-frequency signal soure. It is very practical. Various signals are an important part of correspondent area. In this area , sine wave, triangle wave are common signals. In science rescarch and teaching experiment,we often neet the occurrence equipment of these signals . full functional and eaily used signals source is essential. This paper introduces the low frequency sources of different signals that are produced by AT89c51 SCM and DAC0832. Its signal range and frequenre can be controlled by requirement. This paper briefly introduces the structure principle and usage of DAC0832, the basic theory of AT89c51 and various chips which relevant to design circuit.this paper emphasized how to use SCM to control the hardware circuit and software program of the signals above which produced by DAC0832. The signal frequency range also can be adjusted by requirement. This signal source desing plan concerns on producing different low frequency signals ,not only meet the request of exqeriment in theory and in practice ,but also have strong feasibilily. The trait of this signal source is: small volume ,low pi