Exercise: Combinational Logic Analysis
Questions for: Combinational Logic Analysis
How many AND gates are required to implement the Boolean expression, 
?
?
Answer: C
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One positive pulse with tw = 75 µs is applied to one of the inputs of an exclusive-OR circuit. A second positive pulse with tw = 15 µs is applied to the other input beginning 20 µs after the leading edge of the first pulse. Which statement describes the output in relation to the inputs?
A:
The exclusive-OR output is a 20 
s pulse followed by a 40 s pulse, with a separation of 15 s between the pulses.
s pulse followed by a 40 s pulse, with a separation of 15 s between the pulses.B:
The exclusive-OR output is a 20 s pulse followed by a 15 s pulse, with a separation of 40 s between the pulses.
s pulse followed by a 15 s pulse, with a separation of 40 s between the pulses.C:
The exclusive-OR output is a 15 s pulse followed by a 40 s pulse.
s pulse followed by a 40 s pulse.D:
*The exclusive-OR output is a 20 s pulse followed by a 15 s pulse, followed by a 40 s pulse.
s pulse followed by a 15 s pulse, followed by a 40 s pulse.
Answer: D
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To implement the expression 
, it takes one OR gate and ________.
, it takes one OR gate and ________.
Answer: A
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A 4-variable AND-OR-Invert circuit produces a 0 at its Y output. Which combination of inputs is correct?
A: 
B: 
C: 
D:
none of the above
Answer: C
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Implementing the expression 
with NOR logic, we get:
Answer: A
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