量子元胞自动机干支型交叉线及应用

A Quantum-Dot Cellular Automata Main-Branch Wire Crossing and Its Application

量子元胞自动机(QCA)耦合功能阵列是一种二维的纳米尺度计算范式,可靠性较低的共面交叉线结构是QCA电路交叉互连时的薄弱环节。信号分布网络是实现交叉线功能的一种新方法,但面临元胞随机翻转干扰问题。为解决该问题,首先分析了QCA基本器件逻辑功能实现机理,并提出了一种干支型交叉线。该器件可以在两路信号相遇时选通干路信号屏蔽支路信号,从而达到抑制干扰信号的目的。通过仿真实验得出了其鲁棒功能结构和时钟分配原则。然后利用干支型交叉线改进了异或门设计,仿真结果进一步验证了其逻辑功能。

The coupling function array of the quantum-dot cellular automata （QCA） is a two-di mensional computing paradigm in the nanometer scale. Thus the lowly reliable cop anar wire crossing is a shortcoming of QCA circuit at crossing and interconnection. The signal distribution network is a new method for implementing the functionality of wire crossing, but meets the inter- ference caused by random overturning of the cells. To overcome this problem, the functional mechanism of QCA logic devices was analyzed, and a main-branch wire crossing was proposed. This proposed device can pass the main-line signal, while decline the branch-line one when they meet at the same time, thereby it can get rid of the disturbing signals. Then the robustly func- tional structure and the allocation principle of the clock are obtained with the simulation experi- ments. Furthermore, the design of XOR gate was modified by the main-branch wire crossing. The simulation results further demonstrate its logical function.