Publication

Abstract : Quantum-dot cellular automata (QCA) technology is one of the nanotechnologies which attracted a great deal of consideration because of features like the speed of the circuit, low-power utilization and small size. In digital electronics, the comparator plays a vital role, due to its vast area of applications like state machine design, digital testing and fault tolerance, digital control systems, etc. This paper proposes a 4-bit/8-bit/16-bit comparator in QCA technology using the XOR Gate. The proposed method is an efficient method, which has two stages: finding whether the inputs are equal or not in stage 1 and less than or greater than in stage 2 using an XOR gate. The proposed comparator circuits have less area and cost with less delay as compared to the previous works. The proposed energy calculations are carried out with the QCA DesignerE tool, and it is observed that the proposed structures are energy efficient. In addition, the proposed comparators are simulated and synthesized with Vivado design suite 2021.1 and implemented on the Virtex UltraScale VCU129-PP FPGA board.