A novel design of 8-bit adder/subtractor by quantum-dot cellular automata |
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Authors: | Moein Kianpour Reza Sabbaghi-Nadooshan Keivan Navi |
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Affiliation: | 1. Electrical Engineering Department, Islamic Azad University, Science and Research Branch, Tehran, Iran;2. Electrical Engineering Department, Islamic Azad University, Central Tehran Branch, Tehran, Iran;3. Faculty of Electrical and Computer Engineering, Shahid Beheshti University, G.C., Tehran, Iran |
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Abstract: | Application of quantum-dot is a promising technology for implementing digital systems at nano-scale. QCA supports the new devices with nanotechnology architecture. This technique works based on electron interactions inside quantum-dots leading to emergence of quantum features and decreasing the problem of future integrated circuits in terms of size. In this paper, we will successfully design, implement and simulate a new full adder based on QCA with the minimum delay, area and complexities. Also, new XOR gates will be presented which are used in 8-bit controllable inverter in QCA. Furthermore, a new 8-bit full adder is designed based on the majority gate in the QCA, with the minimum number of cells and area which combines both designs to implement an 8-bit adder/subtractor in the QCA. This 8-bit adder/subtractor circuit has the minimum delay and complexity. Being potentially pipeline, the QCA technology calculates the maximum operating speed. |
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Keywords: | Adder Exclusive OR (XOR) gate Majority gate Quantum-dot Cellular Automata (QCA) Subtractor |
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