A New Modular and Symmetric Full Adder/Subtractor in Quantum-Dot Cellular Automata Nanocomputing

Quantum-dot cellular automata (QCA) is incipient nanotechnology and potential substitute to orthodox CMOS archetypes at nano extent that assures to conceive digital circuits with minimal energy, extreme speed, and particularly dense structures. In this study, a new high-speed and low intricacy QCA full adder-subtractor (FAS) configuration is presented by utilizing the formulations of five inputs majority gate. The proposed circuit is authenticated using the QCADesigner 2.0.3, and based on the outcomes, it is perceived that the outlined FAS is a competent arithmetic logic circuit, and has minimal circuit intricacy, reduced latency and moderated extent compared to existing circuits. Furthermore, a comprehensive transmission route of the proposed FAS is also outlined. QCAPro, a popular energy estimation engine is applied to estimate the energy depletion of the proposed circuit. It is perceived that the designed FAS dissipates minimal energy than existing designs.