EDA（一）数字部分
电子线路仿真实验报告
实验名称： | 编码器、译码器的仿真 |
姓 名： | |
学 号： | |
班 级： | 通信 |
时 间： | 2013.5 |
南京理工大学紫金学院电光系
一、 实验目的
1、熟悉Multisim7仿真软件数电部分的使用；
2、掌握编码器、译码器和数码管逻辑功能和使用方法；
3、能够利用编码器、译码器设计简单键盘编码显示电路。
二、 实验原理
1、10线-4线优先编码器74147
![](https://wkrtcs.bdimg.com/rtcs/image?w=315.46666666667&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"315.46666666667","h":"207.6","dataType":"emf","c":"word/media/image1.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=398.66666666667&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"398.66666666667","h":"222.66666666667","dataType":"gif","c":"word/media/image2.png"})
74147功能表
2、通用七段显示译码器7447
![](https://wkrtcs.bdimg.com/rtcs/image?w=371&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"371","h":"228","dataType":"png","c":"word/media/image3.png","imgOriW":482,"imgOriH":296})
![](https://wkrtcs.bdimg.com/rtcs/image?w=479&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"479","h":"344","dataType":"png","c":"word/media/image4.png","imgOriW":584,"imgOriH":419})
7447功能说明：
1）7447为七段显示译码器集成电路，输出低电平有效，用以驱动共阳显示器。
2）BI/RBO为特殊控制端。作为输入使用时，若BI=0，电路完成灭灯功能。作为输出使用，输出值受制于LT和RBI取值。
3）LT为试灯输入。LT=0， BI/RBO是输出端，且RBO=1，无论其他输入端什么状态，数码管显示8字形。
4）RBI为动态灭零输入。LT=1， RBI=0，且输入代码为0000时，电路不显示，故称灭零。此时BI/RBO是输出端，输出RBO=0。
5）对输入代码0000译码条件是LT=RBI=1；对其他代码译码条件LT=1。
三、 实验内容
1、全加器
![](https://wkrtcs.bdimg.com/rtcs/image?w=551&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"551","h":"402","dataType":"png","c":"word/media/image5.png","imgOriW":698,"imgOriH":509})
2、字信号发生器+逻辑分析仪+全加器
![](https://wkrtcs.bdimg.com/rtcs/image?w=533&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"533","h":"473","dataType":"png","c":"word/media/image6.png","imgOriW":532,"imgOriH":473})
3、逻辑转换仪+全加器
![](https://wkrtcs.bdimg.com/rtcs/image?w=555&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"555","h":"394","dataType":"png","c":"word/media/image7.png","imgOriW":555,"imgOriH":394})
4、74147键盘电路
![](https://wkrtcs.bdimg.com/rtcs/image?w=552&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"552","h":"430","dataType":"png","c":"word/media/image8.png","imgOriW":682,"imgOriH":531})
5、74147+7447键盘电路
![](https://wkrtcs.bdimg.com/rtcs/image?w=515&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"515","h":"517","dataType":"png","c":"word/media/image9.png","imgOriW":516,"imgOriH":517})
6.74138电路
![](https://wkrtcs.bdimg.com/rtcs/image?w=553&md5sum=ae7b23768f9803bf0c0ab5af60dd35d5&sign=3fdb62414c&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=40&ipr={"t":"img","w":"553","h":"349","dataType":"png","c":"word/media/image10.png","imgOriW":801,"imgOriH":507})
四、 小结与体会
通过此次编码器，译码器的仿真实验，我熟悉了Multisim7仿真软件数电部分的使用；掌握编码器、译码器和数码管逻辑功能和使用方法.
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