Question

Exclusive-OR (XOR) logic gates can be constructed from what other logic gates?

(a) OR gates only

(b) AND gates and NOT gates

(c) AND gates, OR gates, and NOT gates

(d) OR gates and NOT gates

The question was posed to me during an interview.

I would like to ask this question from Logic Gates and Networks in division Boolean Algebra and Minimization Techniques and Logic Gates of Digital Circuits

Answer 1

Right choice is (c) AND gates, OR gates, and NOT gates

For explanation I would say: Expression for XOR is: A.(B’)+(A’).B

So in the above expression, the following logic gates are used: AND, OR, NOT.

Thus, 2 AND gates with two-inputs and 1 OR gate with two-inputs will be required for constructing a XOR gate.