Design of a 4-bit ripple adder using Quantum-dot Cellular Automata (QCA)

Sarah Tji Yan Chan, C. F. Chau, Azrul bin Ghazali
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引用次数: 17

Abstract

Quantum-dot Cellular Automata (QCA) is one of the new emerging nanotechnologies explored as an alternative to current CMOS designs. This paper presents the fundamental concepts of QCA and QCA-based logic design. Basic QCA logic circuits such as the inverter, three-input majority gate and five-input majority gate are studied and implemented using QCADesigner. To demonstrate the practical use of using QCA in logic design, a 4-bit ripple adder using a combined concepts from the conventional RCA and CLA is proposed using 20 three-input majority gates, 4 five-input majority gates and 12 inverters. The proposed adder uses 1246 cells which resulted in an area of 1.75um × 1.43um, and a latency of 5.75 clock cycles.
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基于量子点元胞自动机的4位纹波加法器设计
量子点元胞自动机(QCA)是一种新兴的纳米技术,可以替代当前的CMOS设计。本文介绍了QCA的基本概念和基于QCA的逻辑设计。利用qcaddesigner对逆变器、三输入多数门、五输入多数门等基本QCA逻辑电路进行了研究和实现。为了演示QCA在逻辑设计中的实际应用,提出了一种4位纹波加法器,该加法器结合了传统RCA和CLA的概念,使用20个三输入多数门,4个五输入多数门和12个逆变器。所提出的加法器使用1246个单元,其面积为1.75um × 1.43um,延迟为5.75时钟周期。
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