Quantum-dot cellular automata adders

TitleQuantum-dot cellular automata adders
Publication TypeConference Paper
Year of Publication2003
AuthorsWang, W., K. Walus, and G. A. Jullien
Conference NameNanotechnology, 2003. IEEE-Nano 2003. 2003 3rd IEEE Conference on
Pagination461 - 464 vol.2
Date Publishedaug.
Keywordsadders, algorithm, carry logic, cellular automata, four bit adder, hardware, inverters, logic gates, majority gates, parallel structure, quantum dot cellular automata adders structure, quantum dots, quantum well devices

In this paper, a novel quantum-dot cellular automata (QCA) adder design is presented that reduces the number of QCA cells compared to previously reported designs. The proposed one-bit QCA adder structure is based on a new algorithm that requires only three majority gates and two inverters for the QCA addition. By connecting n one-bit QCA adders, we can obtain an n-bit carry look-ahead adder with the reduced hardware while retaining the simple clocking scheme and parallel structure of the original carry look-ahead approach. The proposed adder is designed and simulated using the QCA Designer tool for the four-bit adder case. The proposed design requires only about 70% of the hardware compared to previous designs with the same speed and clocking performance.


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