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Q. 14.14 Write the truth table for the circuit given in Fig. 14.39 below consisting of NOR gates and identify the logic operation (OR, AND, NOT) which this circuit is performing.
(Hint: then
and
inputs of second NOR gate will be
and hence
Similarly work out the values of
for other combinations of
and
Compare with the truth table of OR, AND, NOT gates and find the correct one.)
Answers (1)
A and B are the input od a NOR gate and Output of this NOR gate is the Input of Another NOR gate whose Output is Y. Hence,
Y =
Y = .
Y = A + B
Hence Circuit behaves as OR gate.
Truth table
Truth table
| INPUTS | OUTPUT |
| 00 | 0 |
| 01 | 1 |
| 10 | 1 |
| 11 | 1 |
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