The GATE Grind

GATE 2019 EC – Question 25

Digital Circuits · Combinatorial Circuits · 1 mark · Multiple choice

In the circuit shown, A and B are the inputs and F is the output. What is the functionality of the circuit?

Diagram for GATE 2019 EC question 25
  1. Latch
  2. XNOR
  3. SRAM Cell
  4. XOR

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Show answer and explanation

Correct answer: (B) XNOR

Explanation

The circuit passes $B$ to the output when $A$ is high and $\bar B$ when $A$ is low, giving $F=AB+\bar A\bar B$, which is an XNOR gate.