DESIGN AND IMPLEMENTATION OF EFFICIENT ADDER CIRCUITS USING QUANTUM DOT CELLULAR AUTOMATA (QCA)

Quantum-dot Cellular Automata (QCA) is a promising alternative to Complementary Metal Oxide Semiconductor (CMOS) technology. Many logical circuits are designed using QCA which consume lower power. Adder circuits are the most frequently-used components in digital circuits. New multilayer approaches have been devised to increase the performance of adder circuits. In this paper, we propose the two new efficient multilayer adder circuits. The proposed adder circuits are well-optimized using three active layers. The proposed design enjoys the features of lesser cell counts, reduced area and lesser clock delays as compared to traditional approaches. Our results clearly demonstrate that the proposed adder circuits are area efficient than previous designs. The proposed designs are suitable to reduce the chip size and can be effectively used to realize more complex logic circuits. By applying this method, ultra low power circuits can be designed for nano-electronics. The correct logical functionalities of presented structures have been authenticated using QCADesigner tool ver. 2.0.3.