正弦信号发生器杜恩波毕业设计.docVIP

摘 要 信号发生器是科研、教学实验及各种电子测量技术中很重要的一种信号源，随着科学技术的迅速发展，对信号源的要求也越来越高，要求信号源的频率稳定度、准确度及分辨率要高、以适应各种高精度的测量，为了满足这种高的要求，各国都在研制一些频率合成信号源，这种信号源一般都是由一个高稳定度和高准确度的标准参考频率源，采用锁相技术产生千百万个具有同一稳定度和准确度的频率信号源，为了达到高的分辨率往往要采用多个锁相环和小数分频技术，因此使电路复杂、设备体积圈套、成本较高，传统的频率合成器由于采用倍频、分频、混频和滤波环节，使频率合成技术（DDS），与传统的频率合成技术相比，DDS具有频率分辨率高、频率转变速度快、输出相位连续、相位噪声低、可编程和全数字化、便于集成等突出优点、成为现代频率合成技术中的佼佼者，得到越来越广泛的应用，成为众多电子系统中不可缺少的组成部分。 本文介绍一种以AT89S52、AD9850和8279为核心器件的DDS正弦信号发生器。AD9850是一款专业极的正弦信号产生器件。它的特点正如上文所述的，电路整体结构简单，输出信号波形好，控制简单，而且易于实现程控。AT89S52和8279将在正文部分仔细的说明。 本次因为是毕业设计，我也首次采用12864LCD作显示器件。采用12864作显示器件的好处是可以显示汉字。 关键词：单片机，电压A/D转换，C语言 Abstract Signal generator is a research, teaching experiments and a variety of electronic measurement technology is very important as a signal source, with the rapid development of science and technology, demands on the signal source more and more require the signal source frequency stability, higher accuracy and resolution to suit a variety of high-precision measurements, in order to meet this high demand, all countries in the development of a number of frequency synthesized signal source, such sources are normally a high stability and high accuracy degree of standard reference frequency source, using phase-locked with the same technologies used to produce millions of a degree of stability and accurate frequency signal source, in order to achieve high resolution and often using multiple phase-locked loop fractional-N technology, the circuit complex equipment trap volume, high cost, the traditional frequency synthesizer used as multiplier, divider, mixer and filter links, so that frequency synthesis (DDS), and compared to the conventional frequency synthesis, DDS has a frequency resolution high frequency changes in speed, the output phase continuous, low phase noise, programmable and fully digital, easy integration and other advantages, become a modern leader in synthesizer technology, get more and more widely used, a large number of electronic systems an indispensable component.  Thi