1-Bit Full Adder Design Using XOR Gates by QCA Technology

Abstract

The growth of electronic industry is possible due to the invention and developments of CMOS (Complementary Metal Oxide Semiconductor) technology. Due to its small size and compatibility, small sized circuits and devices are constructed. But when the electronic industry starts to grow, the number of transistors on a chip increases rapidly, thereby device density and operation frequency increases much faster, so power dissipation becomes a major concern. Also for the development of small sized devices the channel length of CMOS reduced, which introduces different short channel effects. Under these size considerations, there is a need to shift from CMOS technology. A number of alternatives such as carbon nanotubes, resonant tunneling devices, single electron devices and Quantum dot Cellular Automata (QCA). Among these Quantum dot Cellular Automata is one of the new emergent technology. QCA is a cellular type of design which consumes low power and low area. In this paper full adder is designed using QCA technology. Full adder is one of the important designs in the electronics industry, especially in ALU design. Here the full adder is designed using a 3-input XOR gate as the main block.