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9.5.2 Combination of Logic Gates

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  1. Logic gates can be combined together to perform certain tasks.
  2. The output can be determined by constructing a truth table.
Example 1:

In the combination of logic gate above, find the outputs X, Y and Z of of the inputs A and B.
Answer:
INPUT OUTPUT
A B X Y Z
0 0 1 1 1
0 1 1 0 1
1 0 1 1 1
1 1 0 0 0


Example 2:

In the combination of logic gate above, find the outputs X, Y and Z of of the inputs A and B.
Answer:
INPUT OUTPUT
A B X Y Z
0 0 1 1 1
0 1 1 0 1
1 0 0 1 1
1 1 0 0 0


Example 3:

In the combination of logic gate above, find the outputs X, Y and Z of of the inputs A and B.
Answer:
INPUT OUTPUT
A B W X Y Z
0 0 0 0 1 0
0 1 1 0 0 0
1 0 1 1 0 0
1 1 1 1 0 0


Example 4:

In the combination of logic gate above, find the outputs X, Y and Z of of the inputs A and B.
Answer:
INPUT OUTPUT
A B W X Y Z
0 0 0 0 1 1
0 1 1 0 0 0
1 0 1 0 0 0
1 1 1 1 0 1