Question

Which one is a basic comparator?

(a) XOR

(b) XNOR

(c) AND

(d) NAND

This question was addressed to me in quiz.

The question is from Magnitude Comparator topic in portion Combinational Circuits of Digital Circuits

Answer 1

The correct choice is (a) XOR

The explanation is: Generally, an XNOR outputs high for even number of 1s or all 0s and outputs low for otherwise. Thus, an XNOR gate is a basic comparator, because its output is “1” only if its two input bits are equal.