JEE Main · 2021 · 25 Jul 2021 · Shift 1 · Semiconductors

Identify the logic operation carried out.

Answer: (C)

Solution

Each of the two input gates is a NAND whose inputs are tied together, which makes it an inverter, so the signals arriving at the output gate are

\overset{ˉ}{A}

and

\overset{ˉ}{B}

. That gate is a NOR, and by De Morgan's theorem

Y = \overline{\overset{ˉ}{A} + \overset{ˉ}{B}} = A \cdot B

The combination carries out the AND operation.

JEE Main · 2021 · 25 Jul 2021 · Shift 1 · Single correct option