Abstract
Quantum-dot cellular automata (QCA) technology is believed to be a good alternative to CMOS technology. This nanoscale technology can provide a platform for design and implementation of high performance and power efficient logic circuits. However, the fabrication of QCA circuits is susceptible to faults appearing in this form of missing cells, additional cells, rotated cells and displaced cells. Over the years, several solutions have been proposed to address these problems. This paper presents a new solution for improving the fault tolerance of three input majority gate. The proposed majority gate is then used to design 2-1 multiplexer and 4-1 multiplexer. The proposed designs are implemented in QCA Designer. Simulation results demonstrate significant improvements in terms of fault tolerance and area requirement. The proposed gate consists of 11 cells and requires an area of 0.0096 μm2. The proposed design has 100% tolerance to the fault of a single missing cell and 71.43% tolerance to the rotation of one cell. The proposed 2-1 multiplexer consists of 41 cells and requires an area of 0.066 μm2. This multiplexer has 95.24% tolerance to the fault of a single missing cell.
Highlights
Today, metal-oxide superconductor technology has extensive application in the production of digital circuits and chips
This paper presents a new solution for improving the fault tolerance of three input majority gate
We first provided a brief introduction to Quantum-dot Cellular Automata (QCA) technology and challenges in the fabrication of QCA circuits and discussed the existing solutions for resolving these challenges
Summary
Metal-oxide superconductor technology has extensive application in the production of digital circuits and chips. This technology, like many others, involves making a tradeoff between speed and power consumption. QCA is a nanotechnology computing architecture originally developed by Dr Craig Lent and his colleagues in 1993[1]. In this architecture, some concepts of quantum mechanics such as tunneling are utilized in the fabrication of potential barriers for cellular automata[3,4]. There are several challenges in implementing QCA technology, which include fabrication faults appearing as missing cells, additional cells, cell displacements, and cell rotations.
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