High performance nanocomparator: a quantum dot cellular automata-based approach

Quantum dot cellular automata (QCA) are emerging nanotechnology that offers few significant advantages like faster speed, higher circuit density, and lower power dissipation. Comparator is a fundamental and essential block in QCA logic circuit family. In this article, a single-layered and straightforward design of a QCA-based one-bit magnitude comparator has been proposed. The proposed design is 6.38%, 6.67% and similar to 10% more efficient in cell complexity, cell area and total area measurement, respectively, in comparison to prior reported designs. Furthermore, the energy dissipation of the proposed circuit has been calculated using QCADesigner-E and QCAPro tools to check the energy efficiency of the proposed circuit. The total energy dissipation of the reported magnitude comparator is 19.50 meV when measured using the QCADesigner-E tool. Similarly, according to the QCAPro tool, it has similar to 71% less energy dissipation than the existing designs.