Quantum Dot Cellular Automata: A Novel Circuit Design Approach (original) (raw)
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Design and Analysis of Digital Circuits Using Quantum Dot Cellular Automata (QCA
Quantum Dot Cellular Automata (QCA) is one of the emerging trends in the field of nanotechnology which help to overcome the limitations of CMOS technology. QCA is simple in structure having significantly lesser elements as compared to CMOS design. It has the potential for attractive features such as faster speed, smaller size and low power consumption than transistor based technology. Quantum-dot cellular automata have a simple cell as the basic element. The cell is used as a building block to construct gates, wires, and memories. By taking the advantages of QCA are able to design interesting computational architectures. Unlike conventional computers in which information is transferred from one place to another by means of electrical current, QCA transfers information by propagating a polarization state. This paper proposes a detailed design and analysis of digital circuits such as combinational and sequential circuits for quantum-dot cellular automata.
Design of Sequential Circuit Using Quantum- Dot Cellular Automata (QCA
— Quantum dot cellular autometa presents a promissing nanoscale technology for replacement of conventional cmos based circuits.In this paper we introduce qca logic gates such has qca inverter and qca majority gate.This paper design the sequential logic gates.such as D latch,SR latch,JK latch,T flipflop,D flipflop,2 bit counter,4 bit shift register.These designs are captured and simulated using a design calld QCA designer.
A Solution to VLSI: Digital Circuits Design in Quantum Dot Cellular Automata Technology
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Quantum Dot Cellular Automata is a Nano device efficient than other devices in nanotechnology for the last two decades. It is beneficial over Complementary Metal Oxide Semiconductor technology like high speed, low energy dissipation, high device density and high computation efficiency. To achieve further optimization different methods like simplifications in Boolean expressions, tile method, clocking scheme, cell placement, cell arrangement, novel input techniques, etc., are in use. These methods improve the performance metrics in terms of QCA Cells, total circuit area, delay in output, power consumption, and coplanar or multilayer layout. This paper is about the novel NOT gate layout designed with efficient parameters compared to existing NOT gates except area parameters with analysis and XOR gate and multiplexer circuits. The novel gate provides an improvement of 55% in the number of cells, polarization raised by 0.33, and an 80.77% improvement in total area. These circuits illustrate further scope in QCA circuit design efficiently. XOR circuit shows area reduction up to 0.006 μm2 with 0.5 clock cycle delay. Further optimization in XOR parameters and with this novel NOT gate researchers can optimize parameters to bring revolution and digitalization.
Logic Circuit Design in Nano-Scale using Quantum-Dot Cellular Automata
European Journal of Scientific Research
One of the emerging technologies that being investigated as an alternative to CMOS VLSI is Quantum-Dot Cellular Automata (QCA). Its advantages such as faster speed, smaller size, and lower energy consumption are very good-looking. Unlike conventional digital circuits in which information is transferred using electrical current, QCA transfers information by propagate a polarization state. This paper proposes a detailed design analysis of combinational and sequential logic circuits for quantum-dot cellular automata. The aim is to maximize the circuit density and focus on a layout that is minimal in its use of cells.
Study and Analysis of 3 -Input Logic Gates By Using Quantum Dot Cellular Automata
2019
Quantum dot cellular automata (QCA) is growing technology with Nano range scale in that, QCA is extremely computational and exceptionally productive than CMOS technology. QCA the parameters like area and usage of power are very less when compared to CMOS technology. In the comparative analysis of QCA and CMOS technologies, the number of quantum cells used and the number of transistors taken place to design 3 input logic gates. In this paper, it explains about the comparison between CMOS and QCA technologies for 3 input basic logic gates like AND, OR, NOT, NAND, NOR ,XOR and XNOR by utilizing the ultra-low power and the area, time taken to outline the circuit with quantum dot cells in QCA technology. From the results, area utilized to design logic gates using by QCA technology as compared to CMOS technology is reduced up to 5%.
Implementation of Sequential Circuits using Quantum dot cellular automata
2012
This Challenging and interesting problem has attract researcher/scientist for various background i.e. psychology, electronics, artificial intelligence, parallel computing, soft computing, quantum computing and nano computing. This paper involves the study and implementation of Quantum dot cellular automata, referred to hereafter as QCA. QCA provides for nanolevel computations using molecular components as computational units. In this paper, RS & JK flip-flops are designed and analyzed using the software QCA Designer. Quantum Dot Cellular Automata has attractive features such as faster speed, smaller size and low power consumption than transients-based technology. The proposed structures of RS & JK flipflops are simulated using QCA Designer. Thus it is interesting to think of the consequences this new technology could have for many logic circuits and digital systems. It is also useful to consider how existing logic could be realized using the new technology.
An Efficient Layout Design of Fredkin Gate in Quantum-dot Cellular Automata (QCA)
Quantum-dot Cellular Automata (QCA) has been considered one of the alternative technologies used in Nanoscale logic design and a promising replacement for conventional Complementary Metal Oxide Semiconductor (CMOS) due to express speed, ultra low power consumption, higher scale integration and higher switching frequency. In this paper, an efficient design of the Fredkin gate based on QCA logic gates: the QCA wire, 3-input majority gate and QCA inverter gate has been presented. Furthermore, compared with the previous design, the number of cells, covered area and latency time of the proposed design has reduced by 62.20%, 76.70%, and 25% respectively and also obviates coplanar wire-crossing. Functional correctness of the presented layout has proved by employing QCADesigner tools. The proposed circuit is suitable for constructing in low power consuming fault-tolerance system and can stimulate higher degree of integrated applications in QCA. Kuantum-noktası Hücresel Otomasyonda (KHO) Fre...
A Review on Quantum Dot Cellular Automata
2017
The scaling of CMOS effect the performance of digital circuits due to factors like heat dissipation and power consumption. The various limitations of CMOS such as heat dissipation, power consumption, size etc. can be overcome by quantum dot cellular automata (QCA). QCA is an efficient technology that provides smaller size, faster response, low power consumption. QCA provides the new and efficient method of computation and information transformation. The main focus of this paper is to study the trends which are proposed to design various digital circuits.
International Journal of Science and Research (IJSR), 2017
Quantum dot cellular automata (QCA), is a rising innovation and a possible alternative for scaling-down trend of VLSI technology. It advantages diminutive size, low power consumption, better switching speed. QCA seems to be a good competitor for future digital systems and widely utilized as a part of advance frameworks. Therefore numerous implementations of QCA based logic functions have been proposed so far. In this paper, an efficient XOR gates is presented. The model proves designing capabilities of combinational logic circuits. The proposed XOR gate has been testified to design logic circuits for QCA. Adder circuit is the most fundamental component used in digital systems. An efficient Half-Adder and Half-Subtractor circuits are designed employing the proposed XOR gate. Performance evolutions of the proposed XOR circuits are compared to its conventional counter parts. The functionality and circuit operation of the proposed designs have been authenticate used QCA Designer simulation tool Ver. 2.0.3.
A novel design of flip-flop circuits using quantum dot cellular automata (QCA)
2018 IEEE 8th Annual Computing and Communication Workshop and Conference (CCWC), 2018
As the device dimension is shrinking day by day the conventional transistor based CMOS technology encounters serious hindrances due to the physical barriers of the technology such as ultra-thin gate oxides, short channel effects, leakage currents & excessive power dissipation at nano scale regimes. Quantum Dot Cellular Automata is an alternate challenging quantum phenomenon that provides a completely different computational platform to design digital logic circuits using quantum dots confined in the potential well to effectively process and transfer information at nano level as a competitor of traditional CMOS based technology. This paper has demonstrated the implementation of circuits like D, T and JK flip flops using a derived expression from SR flip-flop. The kink energy and energy dissipations has been calculated to determine the robustness of the designed flip-flops. The simulation results have been verified using QCA Designer simulation tool.