A full adder structure with a unique XNOR gate based on Coulomb interaction in QCA nanotechnology

Quantum-dot cellular automata (QCA) is a new and considerable technology for implementing nanoscale electronic circuits. QCA technology is considerable in terms of high speed, area and low power consumption compared to CMOS technology and can significantly improve the design of various logic circuits. The XOR/XNOR gate is one of the basic components in a full adder circuit, and improving its performance can lead to an improved full adder. To this end, the purpose of this paper is to provide a new and efficient design for the XNOR circuit based on QCA technology in order to realize the implementation of the new full adder structure. In order to evaluate the efficiency of designed structures, their operation has been studied by QCADesigner software. The simulation results show the superiority of the proposed full adder structure in terms of cell reduction about 5%, 33% in latency (clock zones) and 25% in area reduction compared to the previous structure.