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

Document Type : Articles


Department of Electrical Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran.


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


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