Design and simulation of a QCA 2 to 1 multiplexer (original) (raw)
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Quantum-dot cellular automata (QCA) is currently being investigated as an emerging alternative to conventional silicon MOSFET technology. In this paper, an efficient and optimized 4 to 1 multiplexer design for implementation in QCA is presented. The aim is to maximize the circuit density and also to focus on the layout that is to be minimal in terms of number of cells and delay. The proposed 4 to 1 multiplexer is designed using 5-input majority gate and a 4-input AND/OR gate. For verifying the functionality of the circuit, the proposed layout is simulated using QCADesigner software. The proposed design is compared with the other previous works. The results show that our design has minimal size and cell count, and it is implemented with only four clock phases. Also we have compared the proposed QCA design with conventional CMOS technology. The results confirm that the QCA design is more efficient in terms of area and clock frequency.
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Quantum-Dot Cellular Automata (QCA) is a radical technology, which works at Nanoscale. Due to its numerous advantages over the conventional CMOS-based digital circuits, researchers are now concentrating more on designing digital circuits using this technology. Researchers have reported various findings in this field till now. In this paper, a modular 2:1 Multiplexer has been designed followed by its application in the designing of 1-bit parallel memory. A 4:1 MUX is designed using cascading of two 2:1 multiplexers. This paper also incorporates a comparative analysis of the proposed circuits with some previous designs. This comparison indicates that the designed Multiplexer is showing a considerable reduction in cell count as well as in the area. Here the design and simulation of the circuits are done using QCA Designer Ver. 1.40. Power dissipation simulation analysis of the designed 4:1 multiplexer is also done using QCA Pro tool.
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Quantum-dot Cellular Automata (QCA) is one of the most important computing technologies for the future and will be the alternative candidate for current CMOS technology. QCA is attracting a lot of researchers due to many features such as high speed, small size, and low power consumption. QCA has two main building blocks (majority gate and inverter) used for design any Boolean function. QCA also has an inherent capability that used to design many important gates such as XOR and Multiplexer in optimal form without following any Boolean function. This paper presents a novel design 2:1 QCA-Multiplexer in two forms. The proposed design is very simple, highly efficient and can be used to produce many logical functions. The proposed design output comes from the inherent capabilities of quantum technology. New 4:1 QCA-Multiplexer has been built using the proposed structure. The output waveforms showed the wonderful performance of the proposed design in terms of the number of cells, area, an...
A novel QCA multiplexer design
2008 International Symposium on Telecommunications, 2008
Quantum-dot Cellular Automata is a novel nanotechnology that promises extra low-power, extremely dense and high speed structure for construction of logical circuits at a nano-scale. Moreover, multiplexer is a useful component for the design of many important circuits. This paper proposes a novel and efficient design of 2:1 multiplexer in the QCA. The proposed multiplexer has been compared to few recent designs in terms of area, speed and complexity. Comparison of results illustrates significant improvements in our design as compared to traditional approaches. Also, simulation proves that the proposed multiplexer design is completely robust and more sustainable to high input frequency, as compared to other designs. Simulations have been carried out using the QCA Designer, a layout and simulation tool for QCA.
A Review on QCA Multiplexer Designs
Quantum-dot Cellular Automata (QCA), is a contemporary nanotechnology for manufacturing logical circuits which brings less power consumption, smaller circuit size, and faster operation. In this technology, logical gates are composed of nano-scale basic components called cells. Each cell consists of four quantum-dot arranged in a square pattern. Diagonal arrangement of two extra electrons resembles two logical states 0 and 1. Majority gate and inverter gate are considered as the two most fundamental building blocks of QCA. The effect of cells on their neighbor cells enables designing more diverse circuits. Multiplexer is a key component in most computer circuits. Researchers have presented various QCA designs for multiplexers since the introduction of QCA. In this research all presented designs are simulated in QCA Designer tool version 2.0.3 and investigated from different aspects such as complexity, occupied area, types of components used in circuit, number of layers, and delay.
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Quantum Dot Cellular Automata (QCA) is an alternate version of the existing conventional CMOS technology due to its low power intake, faster speed, and smaller size. A multiplexer is a very important logical block in VLSI designs. In this paper, a 2:1 multiplexer (MUX) architecture is proposed, analyzed and compared with related existing architectures. The kink energy of proposed circuit has been calculated and hazard analysis has been completed successfully. All designs in this paper are simulated, checked, and verified using the popular QCADesigner tool. The comparisons of the proposed design with respect to different parameters of the existing MUX(s) along with their corresponding graphical representations prove the robustness of the proposed multiplexer.