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A robust wire crossing design for thermostability and fault tolerance in quantum-dot cellular automata

机译：Quantum-Dot Cellular自动机的热稳定性和容错的强大线交叉设计

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摘要

Quantum-dot cellular automata (QCA) present an unconventional computing model in the nanometer regime. The applications in QCA require complex wire crossings between intersectional wires. The existing wire crossing schemes show low fault tolerance or thermal instability. In this paper, a robust wire crossing scheme is proposed by using two opposite clock zones and redundant cells. The thermostability and fault tolerance are illustrated by using statistical analysis and fault simulations with regard to cell undeposition. This paper also presents a new signal distribution network (SDN) using the proposed wire crossings. The layouts of an XOR gate and a full adder are investigated to show the scalability of the proposed designs to circuits for logic functions with various number of inputs. For the proposed wire crossing and SDN, the circuitries of metal wires to provide the electric fields for driving the involved cells in each clock zone are also discussed. The functionalities of these circuits are validated by using QCADesigner. (C) 2020 Elsevier B.V. All rights reserved.
机译：量子点蜂窝自动机（QCA）在纳米制度中呈现了一个非常规计算模型。 QCA中的应用需要在交叉线之间复杂的钢丝交叉。现有的线路交叉方案显示出低容错或热不稳定性。在本文中，通过使用两个相反的时钟区域和冗余单元来提出鲁棒线交叉方案。通过使用关于细胞未选择的统计分析和故障模拟来说明热稳定性和容错。本文还介绍了使用所提出的钢丝交叉的新信号分配网络（SDN）。研究了XOR门和完整加法器的布局，以显示所提出的设计的可扩展性，用于具有各种输入数的逻辑功能的电路。对于所提出的线路交叉和SDN，还讨论了金属线的电路，以提供用于驱动每个时钟区域中所涉及的电池的电场。通过使用QCaSeigner验证这些电路的功能。 （c）2020 Elsevier B.v.保留所有权利。

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