四位二进制加法器课程设计报告书.doc

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1、长安大学电工与电子技术课程设计四位二进制加法器专业__车辆工程__班级姓名指导教师民日期_2012.6.11~15__评语评阅人：日期：目录一、评语················································2二、题目名称···········································2三、技术要求···········································4四、摘要及前言·····················

2、·····················4五、总体设计方案的论证及选择····························41、加法器的选取·····································42、译码器的选取·····································43、数码管的选取·····································5六、设计方案的原理，总体电路图···························51、总体原

3、理图·······································52、总体接线图·······································6七、单元电路设计，主要元器件选择与电路参数计算···········61、数据开关设计·····································62、加法器设计·······································73、译码器设计···························

4、············84、数码管设计·······································11八、元器件清单·········································12九、收获与体会·········································12十、参考文献···········································13十一、鸣谢··································

5、···········13十二、附录·············································13一、题目名称四位二进制加法器二.技术要求1.四位二进制加数与被加数输入2.二位数码管显示三、前言及摘要四位二进制加法器的设计包括：1、四位二进制加数和被加数的输入，2、两个数的相加运算及和的输出，3、将两个数的和通过译码器显示在数码管上。二进制数的输入可以通过数据开关实现，用加法器可以进行二进制数的加法运算。两个四位二进制数相加后的和在十进制数的0~30，其中产生的进位

6、和对十进制数十位的判断和显示是重点和难点，这需要通过译码器来实现。对数据译码后即可用合适的数码管与译码器相连，显示数据。四、总体设计方案的论证及元件选择1、加法器的选择在数字系统中，经常需要进行算术运算，逻辑操作及数字大小比较等操作，实现这些运算功能的电路时加法器。加法器是一种逻辑组合电路，主要功能是实现二进制数的算数加法运算。加法器有两种基本类型：半加器和全加器。半加器是指对两个输入数据位进行加法，输出一个结果位和进位，不产生进位输入的加法器电路，是实现两个一位二进制数的加法运算电路。全加器是实

7、现两个一位二进制数及低位来的进位数相加，求得和数及向高位进位的逻辑电路。根据加法器的工作速度选取超前进位加法器。在本设计中选取全加器74LS283。2、译码器选择译码是编码的逆过程，是将二进制代码按其编码时的原意译成对应的信号或十进制数码。译码器是组合逻辑电路的一个重要器件，可分为：变量译码和显示译码两类。变量译码一般是一种较少输入变为较多输出的器件，一般分为2n译码和8421BCD译码。显示译码主要解决二进制数显示成对应的十或十六进制数的转换功能，有七段译码器和八段译码器，此处选择74LS247

8、，控制共阳极数码管。3、数码管的选择数码管数一中发光半导体器件，基本单位是发光二级管。数码管按段数分为七段和八段数码管，按发光二级管的连接方式分为共阳极数码管和共阴极数码管。共阳极数码管是指将所有发光二级管的阳极接到一起形成公共阳极，使用时将公共阳极接到+5v，当某一字段发光二级管阴极为低电平时，该字段点亮，为高电平时就不亮；共阴极数码管是将所有发光二级管的阴极接到一起形成公共阴极，使用时公共阴极接地线，当某一字段二极管的阳极为高电平时，该字段点亮，为高电平时就不亮。上述选取的74