杨磊论文(最后修改).doc

科学技术学院
毕业设计任务书
(工科及部分理科专业使用)

题目: 555振荡电路低频段失真的研究与改进
学科部:
专业:
班级:
学号:
学生姓名:
起讫日期:
指导教师: 朱海宽职称: 讲师
学科部主任:
审核日期:
摘要
针对555振荡电路低频段失真的问题进行的研究,首先对555振荡电路做了简单的介绍,555电路在电路中能得到广泛应用。但通过实验发现,由555电路产生的波在低频段时,波形不稳定、失真,有比较大的上升沿、幅频特性不好。这样低频端波形是不能直接应用于电路之中的,容易使后继电路产生误动作,然后,进行了555集成电路的应用分析与研究,为了便于我们分析和识别电路,更好的理解555 电路,这里我们这里按 555 电路的结构特点进行分类和归纳,把 555 电路分为 3 大类、8 种、共 18 个单元电路。每个电路除画出它的标准图型,指出他们的结构特点或识别方法外,还给出了计算公式和他们的用途。方便大家识别、分析 555 电路。并以555电路定时器为例进行分析,通过设计电路是波形有所改善,使555产生的信号能在电路中得到应用。
关键词:失真振荡触发双稳态

Abstract
In view of the problems of the 555 oscillator circuit frequency distortion of the oscillation circuit, the first of the 555 to do a simple introduction, the 555 circuit can be widely used in the circuit. But through the experiment, the wave generated by the 555 circuit in low frequency, waveform instability, distortion, a larger rise, amplitude frequency characteristics of low frequency waveform is not good. It is can not be directly applied to the circuit, easy to make the subsequent circuit malfunction, and then, the application of the analysis and research of 555 integrated circuit, in order to facilitate our analysis and identification circuit, a better understanding of the 555 circuit, here we here according to the structure characteristics of the 555 circuit classification and the induction, the 555 circuit is divided into 3 categories, 8 species, a total of 18 unit circuit. Each circuit in addition to draw a standard pattern of it, points out their characteristics and identification methods, formulas and their applications are given. To facilitate the identification, analysis of 555 circuit. Taking 555 timer circuit as an example, through the design of the circuit is improved so that the signal waveform, the 555 generation can be used in the circuit.
Keywords:Distortion Oscillation The trigger Bistable
目录:
摘要 1
关键词:失真振荡触发双稳态 1
Abstract 2
一、 555振荡电路简介 35
二、555 时基集成电路的应用 36
三、555集成定时器为例的研究 41
致谢 35
说明 35
一、 555振荡电路简介
555在电路中能得到