Design of One-Bit Comparator Using Multilayer in Quantum-Dot Cellular Automata

摘要

One-bit comparator circuit compares two inputs to indicate whether the two inputs are the same, or which input is larger or smaller, and is often used in arithmetic circuits. One-bit comparators have been proposed to circuit in quantum-dot cellular automata (QCA) technology which isone of the next generation technologies of circuit design. However, existing one-bit comparator circuits are inefficient in terms of circuit area and clock consumption. In this paper, we propose one-bit comparator using a multi-layer structure in QCA. Proposed circuit is possible to extendwires easily by designing the intersections of wires which is connected to the input cells to multi-layer structure. Unlike other wire-crossing techniques, it is easy to design circuits because it uses only one clock. The circuit area and clock consumption are reduced by using multi-layeredwiring-crossing parts. The performance of the proposed circuit is verified by comparing with the existing circuits.