Title: Cost-efficient full adder designs in quantum-dot cellular automata

Authors: Marshal Raj; Lakshminarayanan Gopalakrishnan

Addresses: Department of Electronics and Communication Engineering, National Institute of Technology-Tiruchirappalli, Tamil Nadu, 620015, India ' National Institute of Technology-Tiruchirappalli, 111, Silver Jubilee Block, Tamil Nadu, 620015, India

Abstract: Quantum-dot cellular automata has all the vital characteristics needed by a post-complementary metal oxide semiconductor technology. Adder is a key constituent in any digital circuit system. Several full adder designs are proposed in quantum-dot cellular automata. The different existing techniques used in quantum-dot cellular automata adders are analysed in this work and two cost-efficient full adder designs are proposed using different crossover techniques. The proposed designs have minimum cells and are faster compared to the adders in the literature. They also have the ability to be extended to realise adders of any word length. Missing cell defect analysis is done for the proposed designs and compared with the other adder designs. The designs are validated using QCADesigner.

Keywords: adder; cost; crossover; missing cell defect; quantum-dot cellular automata; QCA.

DOI: 10.1504/IJMPT.2020.111303

International Journal of Materials and Product Technology, 2020 Vol.61 No.1, pp.1 - 15

Accepted: 20 Apr 2020
Published online: 19 Nov 2020 *

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