Question

Design an XNOR gate with two inputs A and B using only NAND gates. Mention the expressions in terms of A & B at the output of each NAND gate in your circuit diagram.

Answer 1

The logic that we are to use is called "NAND logic". An XNOR gate has the following equation:

$$Q=(A\cdot B)+(\bar{A}\cdot\bar{B}).$$

The gate is presented below: