数字电路课程设计频率计.pdf

目录

第一章引言····································4

1.1课程设计目的··································4

1.2课程设计指标··································4

第二章设计方案分析与论证······················5

2.1基本原理概述··································5

2.2设计方案分析··································5

2.3整体方框图分析································6

第三章单元电路设计····························8

3.1时基电路设计··································8

3.2整形与放大电路设计····························9

3.3逻辑控制电路设计······························9

3.4阀门电路设计·································10

3.5计数锁存电路设计·····························11

3.6译码显示电路设计·····························12

第四章频率计数器实物制作·····················13

4.1元件清单····································13

4.2频率计电路原理图·····························14

4.3频率计电路PCB图·····························16

4.4频率计作品实物图·····························17

第五章测试结果分析与设计体会·················18

5.1课程设计结果分析·····························18

5.2课程设计小结·································19

第六章参考文献·······························20

附录一、主要元器件介绍··························21

1．555定时器···································21

2．锁存器74LS273·······························22

3.计数器74LS90································23

4.七段显示译码器74LS48························24

5.七段数码管显示器·····························26

6.双可重触发单稳态触发器74LS123················27

1

第一章引言

数字频率计是一种用数字显示的频率测量仪表，它不仅可以测量

正弦信号、方波信号、三角波和尖脉信号的频率，而且还能对其他多

种物理量的变化频率进行测量，诸如机械振动次数，物体转动速度，

明暗变化的闪光次数，单位时间里经过传送带的产品数量等等，这些

物理量的变化情况可以由有关传感器先转变成周期变化的电信号，然

后用数字频率计测量单位时间内变化次数，再用数码显示出来。因此

它是一种测量范围较广的通用型数字仪器。该装置运用数字电子技术

基础课所学的基本内容，即可完成设计任务。

1.1课程设计目的

（1）了解数字频率计的构成，理解几种常用集成芯片的工作原理

和应用方法。

（2）掌握中小规模集成电路设计与制作的方法。

（3）进一步培养学生对数字电路的综合应用能力和设