Design of Fault-tolerant Quantum-Dot Cellular Automata Full Adder

Quantum-dot cellular automata (QCA) is a newly-developed nanotechnology for next-generation nanoelectronic circuits. QCA circuits use the propagation of charge polarity in QCA cells to pass information without any current being involved. It has the advantages of extremely small size, low power consumption, high device density and twinkling operation process. Nanofabrication of QCA circuits may introduce many defects. Thus fault tolerance is an important requirement to ensure proper function and reliability of QCA circuits. Various faulttolerance techniques have been reported in QCA circuit design. In this poster, a fault-tolerant QCA one-bit full adder based on fault-tolerance majority gates is reported. The fault-tolerance feature of the QCA full adder is analyzed. The one-bit QCA full adder is designed and simulated in QCADesigner software. The Simulation results verify the correct function of the QCA full adder even if individual faults are injected into the circuit. The fault-tolerance feature ensures good reliability of the full-adder even with the defects due to the fabrication process.