1. The function of the circuit in the figure is(______).
请分析图中所示电路的逻辑表达式为(______)。
答案:
X=(AB'+A'B)'
2. From the truth table , draw the circuit (______).
根据真值表画电路图为(______)。
答案:
3. Design a logic circuit to produce a HIGH output only if the input, represented
by a 4-bit binary number(A(MSB) , B , C and D(LSB) ), is greater than eleven or less than five(not including eleven and five). Find the logic expression Y is (______).
设计一个组合逻辑电路满足要求:当输入代表的4位二进制数(A(位权最高) 、B 、C 和 D(位权最低))取值大于11或小于5(不包含11 和 5)时输出为高电平。则其逻辑表达式为(______)。
答案:
Y=A'B'+AB+A'C'D'
4. The input waveforms in the figure are applied to a 1-bit adder. Determine the
waveforms for the sum and the output carry in relation to the inputs by constructing a timing diagram(______).
一位加法器的输入波形如图所示,请确定加法器的本位和和进位输出端的时序波形为(______)。
答案:
5. If you expand two 4-bit comparators to compare two 8-bit numbers,
the cascading inputs A>B, A=B and A如果把两个4位比较器扩展成可接收两个8位数比较,那么低位比较器的级联输入端A>B,A=B和A答案: 010
6. If a 4-line-to-16-line decoder with active-LOW outputs exhibits a LOW on the
decimal 13 output, what are the 4-bit input with active-High(______)?
如果一个输出低电平有效的4线-16线译码器,在十进制数13对应的输出端有低电平输出,那么高电平有效的4位输入为(______)?
答案: 1101
7. A BCD-to-7 segment decoder has 0100 on its inputs. The active outputs
are (______).
0100是七段显示译码器的输入,则输出端为有效电平的是(______)。
答案: b, c, f, g
8. For an 16-line-to-4-line priority encoder consist with two 74LS148 in the
figure, if the output is 0011, which digit input (15~0)is encoded(______)?
由两个74LS148构成的16线-4线优先编码器如图所示。如果输出是0011,是对哪个数字输入端进行的编码(______)?
答案: 3
9. For the 8-input multiplexer circuit in the figure, if the data select
lines are G1G0 = 00,01, determine the output function(______).
对于如图所示的8输入多路复用器,如果数据选择端 G1G0依次等于00,01,则输出函数分别为(______)。
答案:
A;A⊕B.
10. Which kind of memory its memory cells are implemented with latchs?
(______).
哪种类型的内存其记忆单元是由锁存器构成的?(______)。
答案:
SRAM
11. Analyze the following sequential logic circuit, its function of the circuit is
(______).
如下时序逻辑电路功能是(______)。
答案:
A Moore type asynchronous Modulus-10 Counter 摩尔型异步10进制计数器
12. A 3-bit binary counter has a maximum modulus of(______)
三位二进制计数器最大进制数为(______)
答案: 8
13. Three cascaded modulus-10 counters have an overall modulus of(______)
三个十进制计数器级联可以构成(______)进制计数器
答案: 1000
14. The Excitation Equations of the circuit are(______)
下面电路的驱动方程是(______)
答案:
15. What is the correct sequence of sequential logic circuit design(______)?
下面关于时序逻辑电路设计步骤的正确顺序是(______)?
1. Draw Karnaugh maps for each flip-flop's inputs
画出每个触发器输入满足的卡诺图
2. Specify the counter sequence; draw the state diagram and next-state table
确定计数序列,画出状态转换图或次态表。
3. Derive the Excitation equation for each flip-flop's inputs
得到每个触发器的驱动方程
4. Implement the circuit
实现设计的电路
答案:
2134
16.
The load terminal is known as a synchronously input, What is the function of the following circuit(______)?
已知芯片的置数端子是同步工作的,下图所示电路的功能是(______)
答案:
1,2,3,4,5,6,7,8,9,10
17. For the pulse shown in the figure, the amplitude of the pulse is about
( ).
脉冲如图所示,该脉冲的幅值大约是( )。
答案: 20V
18. The circuit shown in the figure is equivalent to an( ).
图中所示电路等价于一个( )。
答案: NOR gate “或非”门
19. Fill in the appropriate functional names for the digital signal processing
system block diagram in the figure. ( )
为下图所示的数字信号处理系统框图填入适当的功能模块名称:( )。
答案:
(From left to right) Sample-and-hold circuit; ADC; DAC; Reconstruction filter (从左到右)采样保持电路;模数转换器;数模转换器;重建滤波
20. Which of the gate could be used in a high-noise industrial environment? The
answer is ( ).
在高噪声环境中应使用下面哪个门?答案是( )。
Gat VOH(MIN) 2.4V VOL(MAX) 0.4V VIH(MIN) 2V VIL(MAX) 0.8V e A Gat 3.5V 0.2V e B Gat 4.2V 0.2V e C
答案: Gate C C门
21. EN=1, what will be the function of the circuit?
EN=1, 该电路的功能是什么? ( )。
2.5V 3.2V
). 0.6V 0.8V
(
答案:
Data B transfer to Data A. 数据B传送给数据A。
22. A J-K flip-flop is in the set condition when( ).
JK触发器输入取值如何时为置数功能( )。
答案: J=1, K=0
23. An astable multivibrator( ).
一个无稳态多谐振荡器( )。
答案:
has no stable state. 没有稳定的状态。
is an oscillator. 是一个振荡器。
produces a periodic pulse output. 能产生一个周期性的脉冲输出。
24. The Binary number 101101.1101 is equal to the Hexadecimal number
( ).
二进制数101101.1101等于十六进制数( )。
<请直接填写数值结果,不要增加其他符号>
答案: 2D.D
25. The Decimal number 23851 is equal to the Hexadecimal number( ).
十进制数23851等于十六进制数( )。
<请直接填写数值结果,不要增加其他符号>
答案: 5D2B
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