Quantum-dot cellular automata (QCA) is a highly attractive alternative to CMOS for future digital circuit design, relying on its high-performance and low-power-consumption features. This paper analyzes and compares previously published five-input majority gates. These designs do not perform well in terms of physical properties, especially concerting power consumption. Therefore, an ultra-low-power five-input majority gate in one layer is proposed, which uses a minimum number of cells and smaller area, and achieves the expected highly polarized output compared with previous designs. In order to evaluate its practicability, a new one-bit coplanar full-adder is proposed. The analysis results show that this full-adder performs well compared with existing multilayer and single-layer designs. The number of cells of the proposed design is reduced by 7.14% to get the same area and clock delay compared with the best coplanar full-adder. In addition, its power dissipation is also reduced by 9.28% at 0.5[Formula: see text], 11.09% at 1[Formula: see text] and 12.66% at 1.5[Formula: see text] in terms of average energy dissipation compared with the best single-layer design. QCADesigner tool is used to verify the simulation results of the proposed designs and QCAPro tool is used to evaluate the power dissipation of all considered designs.
Ultra Low Power Design of Full Adder Circuit using Adiabatic Logic Techniques
