A Novel Five-input Multiple-function QCA Threshold Gate

QCA (Quantum-dot Cellular Automata) is a promising new technology with low power consumption and high speed that allows the design of nanoscale integrated circuits. The 3-input/1-output majority gate is the basic building block in QCA circuits. This work presents a new design of a multi-output, 5-input majority gate. Our proposed gate is quite useful because its outputs can present different configurations with several logical functions at once, enabling the design of smaller circuits. Also, the proposed gate is a feasible solution for the recently proposed USE (Universal, Scalar and Efficient) clocking scheme. In order to demonstrate the flexibility and area efficiency of our 5-input majority gates we implement two designs: a full adder and a RAM cell block. These designs have been implemented using a free and a regular (USE) clock schemes. Our results show area reductions up to 50% compared to state-of-the-art designs.