A Novel Design of a Multi-layer 2:4 Decoder using Quantum- Dot Cellular Automata

The quantum-dot cellular automata (QCA) is considered as an alternative tocomplementary metal oxide semiconductor (CMOS) technology based on physicalphenomena like Coulomb interaction to overcome the physical limitations of thistechnology. The decoder is one of the important components in digital circuits, whichcan be used in more comprehensive circuits such as full adders and memories. Thispaper proposes the 2:4 decoder using multilayer QCA technology. The multilayerdecoder provides requirements of high-density devices with good computing power.The proposed 2:4 active high decoder reduces the clock phases to three, making thecircuit faster than previous ones. Moreover, the number of cells and occupied space aresignificantly reduced, thus reducing power consumption. Multi-layer architecture hasmore reliability than coplanar architecture and allows for the easy layout change. Thestructure was simulated using QCA Designer software, and the simplified expressionsand standard functions have been presented. The simulation results can be useful forusing them in logic circuits.