The logic circuit shown below has the input waveforms 'A' and 'B' as shown. Pick out the correct output waveform. Output is (a) (b) (c) (d)

Answer: (d). The NOT gates give A and B, and the NOR gives Y = A + B = A · B (AND). So Y = 1 only in the intervals where both A and B are high. That happens in the first interval and in the interval where the second A pulse overlaps a B pulse; elsewhere Y = 0. So the answer is (d).

The logic circuit shown below has the input waveforms 'A' and 'B' as… | JEE Main 2009 (AIEEE)

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Logic Gates

The logic circuit shown below has the input waveforms $\text{'}A\text{'}$ and $\text{'}B\text{'}$ as shown. Pick out the correct output waveform.

Output is

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Answer: (d)

The NOT gates give $\bar{A}$ and $\bar{B}$ , and the NOR gives $Y = \overline{\bar{A} + \bar{B}} = A \cdot B$ (AND).
So $Y = 1$ only in the intervals where both $A$ and $B$ are high.
That happens in the first interval and in the interval where the second A pulse overlaps a B pulse; elsewhere $Y = 0$ .
So the answer is (d).

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