电子技术课程设计-低频信号发生器.docVIP

长 安 大 学 电子技术课程设计 课题名称 低频信号发生器 班 级 姓 名 指导教师 日 期____2011.1______ 前 言 正弦交流信号是一种应用极为广泛的信号，它通常作为标准信号 ，用于电子电路的性能试验或参数测量。另外，在许多测试仪中也需要用标准的正弦信号检测一些物理量，正弦信号用作标准信号时，要求正弦信号必须有较高的精度，稳定度及低的失真率。 本次电子课程设计的低频正弦信号发生器的要求为：信号的频率范围为20HZ～20KHZ;输出电压幅度为5V；输出信号频率数字显示；输出电压幅度显示。 针对以上设计要求，我们从图书馆收集，借阅了大量相关书籍，从网上下载了诸多相关 资料，其次安装并学习使用了电路设计中所常使用的Multisim仿真软件。在设计的要求下，画出了整体电路的框图，将其分为正弦信号发生器，输出电压和幅度数字显示，输出信号频率和其数字显示三大部分。其次我们对每个单元电路进行设计分析，对其工作原理进行介绍，最后使用Multisim软件画出单元电路，并对其仿真。 完成电路的设计与分析后，对资料与设计电路进行整理，排版，完成课程设计报告。 目 录 摘要······································································3 关键字····································································3 设计要求··································································3 系统概述·························································3 单元电路设计与分析···············································5 正弦信号产生和放大电路模块设计···································5 数字的频率显示···················································11 数字电压表设计··················································19 系统综述·························································29 结束语···························································30 参考文献··································································30 鸣谢······································································30 元器件明细表······························································31 收获与体会，存在的问题····················································32 评语······································································33 低频正弦信号发生器 摘要： 信号发生器又称信号源或振荡器，在生产实践和科技领域中有着广泛的应用能够产生多种波形，如三角波、锯齿波、矩形波（含方波）、正弦波的电路被称为函数信号发生器电路实验和设备检测中具有十分广泛的用途。 本文用MAX038芯片实现低频正弦信号的发生，借助于放大器对正弦信号进行放大，这种电路流程简单、运算速度高、便于调节与实现并且集成度强。 关键词 正弦波 信号发生器 放大器 频率显示 电压显示 技术要求 信号频率范围20HZ～20KHZ; 输出信号电压幅度 5V； 输出信号频率数字显示； 输出电压幅度数字显示。 第一章．系统综述（内容用小4 号字宋体） 根据任务书的要求，系统可分为三大部分，即正弦信号的产生；输出频率的范围和其显示；输出电压的幅度和显示，我们采用MAX038芯片产生正弦信号，该芯片能产生高精度的信号，频率范围大，功耗低，信号产生后再通过运放OPA604的功率放大来满足输出电压的幅度要求，然后通过555定时器组成的施密特触发器，单稳态 电路，多谐振荡电路对其放大整形和控制，最终通过十