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北京航空航天大学2011《数字电路与系统》期末考试试卷(A 卷)

北京航空航天大学2011《数字电路与系统》期末考试试卷(A 卷)
北京航空航天大学2011《数字电路与系统》期末考试试卷(A 卷)

北京航空航天大学

2011 ~2012 学年第一学期

《数字电路与系统》期末考试试卷(A卷)

答案及参考评分标准

一、(10分,每小题2分)判断各题正误,正确的在括号内记“√”,错误的在

括号内记“×”。

(1) 对于十进制纯小数,求它的二进制表示可以采用“除2取余”法。………(×)

(2) TTL门电路在高电平输入时,其输入电流很小(74系列每个输入端的输入电

流约为40μA)。…………………………………………………………(√)

(3) 三态门输出为高阻时,其输出线上的电压为高电平。…………………(×)

(4) 单稳态触发器的暂稳态维持时间的长短取决于外界触发脉冲的频率和幅

度。…………………………………………………………………………(×)(5) 当时序逻辑电路存在无效循环时,该电路不能自启动。………………(√)

第 1 页共11 页

三、(15分)如图3-1(1) (2) (3) 化简后的结果Y 2(解:

(1) Y (A ,B ,C ,D )=B A ??(2) Y 1(A ,B ,C ,D )=C B ?说明:(3) Y 2(A ,B ,C ,D )= Y 1(A ,说明:

四、(15分)已知电路原理图如图4-1所示,CP1、CP2的波形如图4-2所示,

设触发器的初始状态均为“0”,请在图4-2中画出输出端B和C的波形。

图4-1

图4-2

解:

评分标准:①只要画对任意一次B、C和CP1/CP2的配合关系,即可得7分,其余二次,B和C的波形每对1次,2分;②如果三次配合关系都不对,则B和C 的波形每对1次,2分;③如果画得配合关系无法识别,则能够正确识别上升沿触发,每对1次,1分;④如果画出了异步清零的门传输延迟,则是更加精确的答案,同样可以得分,且可以在出现其它失误的时候可以酌情加1~2分。

第 4 页共11 页

???R K J

n Y Q +??

?R K J

图7-1

第10 页共11 页

解:

(1) (2) (3)

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