DESIGN AND IMPLEMENTATION OF MULTILAYER XOR/XNOR GATES BASED ON QUANTUM DOT CELLULAR AUTOMATA (QCA)

Quantum-dot Cellular Automata (QCA) is a novel nanotechnology to develop computing devices and a possible alternative to Complementary Metal Oxide Semiconductor (CMOS) transistor. It advantages such as lower power consumption, higher device density and faster switching speed in nano electronic circuits. This paper presents a new methodology to design multilayer 2-input and 3-input Exclusive-OR (XOR)/Exclusive-NOR (XNOR) gates. The proposed design enjoys the features of less area, reduced circuit complexity and less clock delays and superior performance factors in respect of device density and circuit stability. Multilayer scheme is an essential instrument in future QCA fabrication technology to achieve high device density as well as minimum clock delays in logical and functional circuits. The simulation results of proposed designs have been verified using QCA Designer tool ver. 2.0.3. This tool simulates the QCA circuits based on two different simulation engines exhaustive verifications and vector table. In this study, simulation results have been carried out using exhaustive verifications.