基于模块化技术的最佳ULG.2的QCA电路设计

为了减少纳米器件量子细胞自动机(QCA)电路的线交叉数和电路综合时采用的门电路类型,在介绍QCA细胞结构、逻辑器件、模块化设计技术以及最佳通用逻辑门ULG.2的基础上,提出基于模块化技术的最佳通用逻辑门ULG.2的QCA电路实现方案.利用最佳QCA通用逻辑门ULG.2设计了全加/减器、全比较器和4选1数据选择器.所设计的QCA电路均用QCADesigner软件进行模拟,结果表明：该电路不仅具有正确的逻辑功能,而且某些性能得到了很大的改善.特别地对于4选1数据选择器,与已有的多数门和反相器直接设计的电路相比,细胞数、QCA线交叉数分别减少了31.8%和62.5%.

QCA circuit design of optimal universal logic gate ULG.2 based on modular methodology

In order to reduce the number of wire-crossings in quantum-dot cellular automata (QCA) circuits and the types of QCA logic gates in logic synthesis, based on the introduction of basic principles of QCA , QCA logic devices and modular design methodology, a novel QCA optimal universal logic gate ULG.2 was designed. Three circuits of full adder/subtraction, full comparator and 4-to-1 multiplexer were implemented with the optimal QCA universal logic gate ULG.2. Simulation by using the QCADesigner tool for the proposed QCA circuits confirms that the proposed circuits have correct logic function and their performance was improved dramatically in comparison to the other previous designs. Especially, the proposed 4-to-1 multiplexer was reduced 31.8％QCA cells and 62.5% number of wire-crossings compared with the traditional design based on majority gates and inverters.