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Design of a novel reversible structure for full adder/subtractor in quantum-dot cellular automata
摘要： Complementary Metal Oxide Semiconductor (CMOS) technology uses voltage levels for binary computation, whereas Quantum Dot-Cellular Automata (QCA) uses free electron location in the QCA cell for logic evaluation. This technology suggests very low power consumption, high speed and very dense structure for performing any logical circuit. Reversible logic is best mechanism with low power and high speed in circuit designing. Reversible gates have N input and N output lines that input lines mapped with output lines one by one. In this paper, a novel design of Reversible Full adder/subtractor with minimum number of cells has been proposed. QCADesigner software has been used to simulate the proposed design.
关键词： Quantum-dot Cellular Automata (QCA),Reversible Full adder/subtractor
更新于2025-09-23 15:23:52
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[ACM Press the 14th IEEE/ACM International Symposium - Athens, Greece (2018.07.17-2018.07.19)] Proceedings of the 14th IEEE/ACM International Symposium on Nanoscale Architectures - NANOARCH '18 - Signal Synchronization in Large Scale Quantum-dot Cellular Automata Circuits
摘要： Quantum-dot fabrication is a well-established nanotechnology, which have many applications in many different scientific fields. By placing four quantum-dots on the corners of a square, a cell is formed, in which the digital information can be stored. This cell serves as the structural device of Quantum-dot Cellular Automata (QCA) circuits. After QCA presentation, several digital circuits and systems have been designed and proposed in the literature. However, one of the biggest problems QCA designers have to face to pave the successful design of functional and large scale QCA circuits is signal synchronization. In this paper, a novel approach of the aforementioned problem is presented. This approach is inspired by the well known computational problem of Firing Squad Synchronization (FSS). FSS problem has many similarities with large scale QCA circuits synchronization problem. In addition, FSS problem has been studied by many researchers and many efficient solutions have been proposed in the literature.
关键词： Synchronization,Firing Squad Synchronization problem,Quantum-dot Cellular Automata (QCA),Large Scale Circuits,Nanoelectronics
更新于2025-09-23 15:22:29
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An Efficient Clocking Scheme for Quantum-dot Cellular Automata
摘要： Fast pace growth in the IC industry is facing the challenges of feature size reduction which in turn demands an alternative to current CMOS VLSI. Quantum-dot cellular automata is emerging as one of the viable alternative nanotechnologies with high device density, high operating frequency and low power characteristics. Information transition and propagation in QCA take place with the underlying clocking circuitry. Thus, clocking is the main source of power of the QCA circuit as well as play the vital role of information synchronization in QCA circuit. For efficient design and to provide routing option, a regular, scalable clocking structure becomes the utmost necessity of QCA circuit. In this context, a robust, efficient and scalable (RES) clocking scheme for QCA circuit is proposed which can facilitate three directional information flow within a single clock zone. Also, it can facilitate the feedback path without extra layer (unlike 2DDwave scheme) and overcome the complex multilayer wire crossing (unlike USE scheme) with most promising coplanar crossover. Simulation results underpin the significant improvement in terms of clocking zone, area and cells.
关键词： Coplanar Wire Crossing,Quantum-dot Cellular Automata (QCA),Clocking Circuitry,Clocking,Feedback Path
更新于2025-09-23 15:22:29
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An Efficient Design of DCT Approximation Based on Quantum Dot Cellular Automata (QCA) Technology
摘要： Optimization for power is one of the most important design objectives in modern digital image processing applications. The DCT is considered to be one of the most essential techniques in image and video compression systems, and consequently a number of extensive works had been carried out by researchers on the power optimization. On the other hand, quantum-dot cellular automata (QCA) can present a novel opportunity for the design of highly parallel architectures and algorithms for improving the performance of image and video processing systems. Furthermore, it has considerable advantages in comparison with CMOS technology, such as extremely low power dissipation, high operating frequency, and a small size. Therefore, in this study, the authors propose a multiplier-less DCT architecture in QCA technology. The proposed design provides high circuit performance, very low power consumption, and very low dimension outperform to the existing conventional structures. The QCADesigner tool has been utilized for QCA circuit design and functional verification of all designs in this work. QCAPro, a very widespread power estimator tool, is applied to estimate the power dissipation of the proposed circuit. The suggested design has 53% improvement in terms of power over the conventional solution. The outcome of this work can clearly open up a new window of opportunity for low power image processing systems.
关键词： DCT,low power,QCA,quantum-dot cellular automata,image processing
更新于2025-09-16 10:30:52
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A novel design of multiplexer based on nano-scale quantum-dot cellular automata
摘要： Quantum-dot Cellular Automata (QCA) is known as one of best alternative technologies for CMOS, on nano-scale dimensions, which allows digital circuits to be designed with high speed and density. In this paper, a novel 2:1 multiplexer in QCA technology is proposed. This proposed QCA multiplexer uses a new formulation based on an introduced MV32 gate. The MV32 gate has three inputs and two outputs and operates based on cell interactions. A multi-layer design for proposed 2:1 QCA multiplexer is provided. The simulation results obtained by the software, QCADesigner 2.0.3, confirm that the proposed multiplexer works well and can be applied as a high performance design, in QCA technology. Moreover, the 2:1 QCA multiplexer is used to create 4:1 and 8:1 QCA multiplexers. The results of comparisons show that the proposed structures have so better performance than many previous designs.
关键词： multiplexer,circuit design,Quantum-dot Cellular Automata (QCA),nanotechnology
更新于2025-09-10 09:29:36