An Optimal design of 2-to-4 Decoder circuit in coplanar Quantum-dot cellular automata

Quantum-dot Cellular Automata (QCA), an emergent nanotechnology which promises to deals with the limitations of CMOS technology. This technology offers very low power operation of digital systems with high speed. This paper represents an efficient 2-to-4 decoder, which has been designed with the help of three-input majority voters and successfully implemented in QCA. The design is optimized by considerably reducing the number of cell counts and QCA wire crossings. The proposed decoder is more robust and enjoys single layer wire crossing, via clock phasing, which requires only one type of cell. The results shows that the proposed decoder circuit performs equally well compared to existing decoder designs and performs better in case of previous coplanar decoder designs with enable input functionality in all aspects. Our design achieves 41% and 28% improvement in number of cell counts and 43% and 42% area improvements in comparison to the existing five input and three input based majority gates decoder designs respectively, which have presented in this paper. QCA Designer tool is used to validate the layout of the proposed designs.