Designing a new reversible ALU by QCA for reducing occupation area

Abstract

Quantum-dot cellular automata (QCA) is a novel promising nanoscale technology with high speed, low power consumption and high density that allows the design of integrated circuits. This potential merit instigated the QCA to be an appropriate alternative to the complementary metal oxide semiconductor (CMOS) technology. The arithmetic and logic unit (ALU) is considered as the basis of processing and computational units in processor systems. In this paper, we proposed a new design for reversible ALU. The significant advantages of the proposed method are low complexity, high performance, low cellular consumption, high speed and low occupation area. The proposed scheme was designed at three levels and four gates: “AND,” “OR,” “XOR” and “Full Adder.” The proposed method was simulated by QCADesigner. According to the simulated results, it reduced cell count for 28% and area for 51% in comparison with previous works.