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1. (TCO 1) A periodic
pulse waveform is measured using an oscilloscope. If the horizontal scale is
set to 10 µsec/division and one period covers three vertical divisions, what
is the frequency of the signal? (Points : 5)
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Question 2. 2. (TCO 2) What is the ratio of time on to time off for a
periodic pulse with a duty cycle of 5%? (Points : 5)
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Question 3. 3. (TCO 3) What is the decimal value of the signed number 0101
1010? (Points : 5)
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Question 4. 4. (TCO 4) What is the basic logic function that generates a LOW
only if all of its digital inputs are LOW? (Points : 5)
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Question 5. 5. (TCO 5) If the inputs to a 1-bit full-adder are A = 1, B = 0,
Cin =1, what are the
outputs? (Points : 5)
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Question 6. 6. (TCO 6) What is the minimum number of select lines required
for an 8-to-1 multiplexer? (Points : 5)
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Question 7. 7. (TCO 7) A J-K flip-flop has Q = 1. The output will always
change on the next clock edge when (Note: the X indicates a don’t care
condition) (Points : 5)
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1.(TCO 1) The figure below shows an oscilloscope screen capture of
a periodic signal. The oscilloscope settings are: time scale = 20 ns/div and
voltage scale = 1 V/div. What are the frequency and the peak voltage for the
signal shown? The minimum value of the signal is 0V.
2.(TCO 2) What is the minimum number of bits required to represent
+56,392 using 2’s complement form? Explain how you get your answer.(Points :
10)
3. (TCO 3) Convert the following
decimal negative numbers to their 8-bit, 2’s complement formulation: -1, -99,
-123. (Points : 10)
4. (TCO 4) A 2-input NOR gate has
inputs A and B. If the output of the gate remains LOW independent of the state
of input A, what can be deduced about B? Please explain your reasoning. (Points
: 10)
6. (TCO 5) Can the least significant
full adder (inputs A0 and B0) in a 4-bit binary adder be replaced with a half
adder? Justify your answer. (Points : 10)
7. (TCO 6) Develop the Boolean
equation for the output of a 1-to-2 demultiplexer with select line S, input D,
and outputs Y0 and Y1 (Points : 10)
8. (TCO 6) Develop the Boolean
expression for Y4 in the 3-to-8 decoder circuit shown below. Input C is the most
significant bit.
11. (TCO 5) Using a 4-bit
adder/subtractor, carry out the binary operations for 9 - 3 and 3 - 9. How are
the answers different, and how do you interpret the results? (Points : 10)
1. (TCO 2) How many decimal numbers
can be represented by 8-bits? What are the largest positive and negative signed
decimal numbers that can be represented by 8-bits? Explain how you got your
answer. (Points : 20)
2. (TCO 3) Describe the difference
between overflow and carry out for a 4-bit adder-subtractor circuit. (Points :
20)
3. (TCO 4) Develop the Boolean
expression for the truth table shown below. Express the answer in both the
complete and simplified SOP formats. Use an apostrophe to indicate negation.
5. The input to 74LS47N must be 0 1 0 1 inorder to display 5 .
For that I used 1A 2A 3A 4A inputs and the other 1B 2B 3B 4B left idle. Even
though inputs are given to them,because of selection line,only 1A 2A 3A 4A will
be selected.
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