毕业设计-----函数信号发生器.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电压振幅的1000倍变化。而这是电路所不希望的。幅度稳定性难以达到要求。而且通过仿真实验会发现积分器极易产生失调。② 2.2 〖方案二〗 利用ICL8038芯片构成8038集成函数发生器。 8038集成函数发生器是一种多用途的波形发生器，可以用来产生正弦波、方波、三角波和锯齿波，其振荡频率可通过外加的直流电压进行调节，所以是压