No abstract

Quantum-dot cellular automata (QCA) is a pioneer alternative solution for conventional Complementary Metal Oxide Semiconductor (CMOS) technology limitation in upcoming years. The major technology limitations of conventional CMOS are power dissipation and scaling which can be surpassed by QCA. In QCA loss of information plays dominant role in the power dissipation of the system design. The issue of power consumption is addressed by designing the system using reversible logic. Multiplier and adders are the two important blocks present in applications such as multimedia and artificial intelligence. 4:2 compressor is one of the vital components of any multiplier design. In applications such as multimedia since human eye is not able to identify small changes, approximate 4:2 compressor has gained the highest significance. Designing in-accurate 4:2 compressor with minimum error distance and improved electrical performance is highly demanded. In this paper a novel reversible inexact 4:2 compressor design is presented. The proposed design is based on majority-3 and majority-5 gates. The new compressor advances the existing design in terms of error distance in Carry out. The simulations were carried out in QCA Designer. The design exhibits the improvements in optimization parameters such as cell count and garbage output.