A Novel Design for XOR Gate used for Quantum-Dot Cellular Automata (QCA) to Create a Revolution in Nanotechnology Structure

Abstract

—Novel digital technologies always lead to high density and very low power consumption. One of these concepts is Quantum-dot Cellular Automata (QCA), which is one of the new emerging nanotechnology-based on Coulomb repulsion. This article presents three architectures of logical " XOR " gate, a novel structure of two inputs " XOR " gate, which is used as a module to implement four inputs " XOR " gate and eight inputs " XOR " gate using QCA technique. The two inputs, four inputs, and eight inputs QCA " XOR " gate architectures are built using 10, 35, and 90 Cells on 0.008 µm 2 , 0.036 µm 2 and 0.114 µm 2 of areas, respectively. The proposed " XOR " gate structure provides an improvement in terms of circuit complexity, area, latency and type of cross wiring compared to other previous architectures. These proposed architectures of " XOR " gate are evaluated and simulated using the QCADesigner tool version 2.0.3. Keywords—QCA exclusive-OR; XOR gate; quantum-dot cellular automata (QCA); nanotechnology; majority gate; unique structure; QCA designer