The GATE Grind

GATE 2018 EC – Question 18

Digital Circuits · Combinatorial Circuits · 1 mark · Multiple choice

The logic function $f(X,Y)$ realized by the given circuit is

Diagram for GATE 2018 EC question 18
  1. NOR
  2. AND
  3. NAND
  4. XOR

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Show answer and explanation

Correct answer: (D) XOR

Explanation

The two inverted inputs steer the pass-transistor stacks so that the output is $X\bar Y+\bar XY$ (the output connects to $\bar Y$ when $X=1$ and to $Y$ when $X=0$), which is the XOR function.