函数信号发生器(毕业设计)精选.doc

摘 要 本系统以ICL8038集成块为核心器件，制作一种函数信号发生器，制作成本较低。适合学生学习电子技术测量使用。ICL8038是一种具有多种波形输出的精密振荡集成电路，只需要个别的外部元件就能产生从0.001Hz～30KHz的低失真正弦波、三角波、矩形波等脉冲信号。输出波形的频率和占空比还可以由电流或电阻控制。另外由于该芯片具有调制信号输入端，所以可以用来对低频信号进行频率调制。 函数信号发生器根据用途不同，有产生三种或多种波形的函数发生器，其电路中使用的器件可以是分离器件，也可以是集成器件，产生方波、正弦波、三角波的方案有多种，如先产生正弦波，根据周期性的非正弦波与正弦波所呈的某种确定的函数关系，再通过整形电路将正弦波转化为方波，经过积分电路后将其变为三角波。也可以先产生三角波-方波，再将三角波或方波转化为正弦波。随着电子技术的快速发展，新材料新器件层出不穷，开发新款式函数信号发生器，器件的可选择性大幅增加，例如ICL8038就是一种技术上很成熟的可以产生正弦波、方波、三角波的主芯片。所以，可选择的方案多种多样，技术上是可行的。 关键词： ICL8038，波形，原理图，常用接法 目 录 摘要·······································································1 目录 ·····································································2 第一章 项目任务 ·························································3 1.1 项目建 ·····························································3 1.2 项目可行性研究·······················································3 第二章 方案选择··························································4 2.1 [方案一] ···························································4 2.2 [方案二] ···························································4 第三章 基本原理 ··························································5 3.1函数发生器的组成 ····················································6 3.2 方波发生器 　························································6 3.3 三角波发生器　 ······················································7 3.4 正弦波发生器 ······················································9 第四章 稳压电源 ························································10 4.1 直流稳压电源设计思路 ·············································10 4.2 直流稳压电源原理 ·················································11 4.3设计方法简介 ······················································12 第五章 振荡电路 ························································15 5.1 RC振荡器的设计 ··················································15 第六章 功率放大器 ·························································17 6.1 OTL 功率放大器ICL8038芯片简介 7.5　工作原理 1000倍的频率覆盖系数，显然对于1000倍的频率变化会有积分时间dt的1000倍变化从而导致输出