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GATE 2024 PH – Question 24

Electronics · basics of digital logic circuits, combinational and sequential circuits, flip- flops, timers, counters, registers, A/D and D/A conversion. · 1 mark · Multiple choice

Consider the following circuit: Suppose the input signal P is and the input signal Q is Which one of the following output signals is correct?

Three NAND gates, input pulse trains and output candidates.
  1. Option A in the figure
  2. Option B in the figure
  3. Option C in the figure
  4. Option D in the figure

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Show answer and explanation

Correct answer: (A) Option A in the figure

Explanation

The first two NAND gates act as inverters. The final NAND gives $\neg(\neg P\land\neg Q)=P\lor Q$, yielding the three pulses in A.