Question

All the comparisons made by comparator is done using ____________

(a) 1 circuit

(b) 2 circuits

(c) 3 circuits

(d) 4 circuits

The question was asked in semester exam.

This interesting question is from Magnitude Comparator in section Combinational Circuits of Digital Circuits

Answer 1

Right answer is (a) 1 circuit

Easiest explanation: A comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. Because, all the input is compared to each other, therefore it is possible only by using 1 circuit.