A Novel Robust QCA Full-adder

Quantum-Dot Cellular Automata (QCA) as a candidate technology to replace CMOS promises extra low-power, extremely dense and high speed structures at a nano scale. This paper presents a novel robust QCA full-adder based on an efficient five-input majority gate. This design in contrast to its counterparts uses a robust crossover scheme and surpasses the best previous robust designs in terms of area, delay and complexity. Regarding the efficient layout of this component, it is used to design Ripple Carry Adders with different sizes. The simulations of the proposed designs were done using the both coherence and bi-stable simulation engines of QCA designer version 2.0.3 and same results were achieved which indicate the efficiency and robustness of the proposed designs.