Physics - Semiconductors Question with Solution | TestHub

The given logic circuit consists of two NAND gates.

The output of the first NAND gate with inputs $A$ and $B$ is:
$Y=\overline{A\cdot B}$

This output $Y$ is connected to both inputs of the second NAND gate. A NAND gate with its inputs tied together acts as a NOT gate.

The final output $X$ is:
$X=\overline{Y\cdot Y}=\overline{Y}$

Substituting the value of $Y$:
$X=\overline{\overline{A\cdot B}}=A\cdot B$

Thus, the circuit acts as an AND gate.

Answer: $X=A.B$