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Edited by: Editorial Board of Journal of Data Acquisition and Processing
P.O. Box 2704, Beijing 100190, P.R. China
Sponsored by: Institute of Computing Technology, CAS & China Computer Federation
Undertaken by: Institute of Computing Technology, CAS
Published by: SCIENCE PRESS, BEIJING, CHINA
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      07 April 2023, Volume 38 Issue 2   
    Article

    QCA DESIGN OF FULL ADDER AND FULL SUBTRACTOR USING XOR GATE
    Ch. Naveen Kumar1 , S. Lakshman Teja2 , S . Prathyusha3 , P . Ravi Teja 4 , V . Yaswanth5
    Journal of Data Acquisition and Processing, 2023, 38 (2): 4405-4412 . 

    Abstract

    In a recent times CMOS technology was replaced by the Quantum-dot cellular automata (QCA).It is because of Quantum-dot cellular is emerging designing technology in recent times. Circuits are fabricated by the quantum cells in QCA technology , its major advantage is its highly operating frequency and small size. Each unit in a QCA is called as cell and each cell consists of a four dots ,in that four dots two are electrons .Quantum dots are nanoscale structures which are constructed from semiconductors such as InAs and GaAs. The target is to implement the better design of full adder with mux logic and full subtractor with XOR logic for better performance . For that the fundamental blocks are majority gate, XOR gate .The existed methods contains 68 cells full adder with a clock cycle delay to over come that we came with a method so that cells are reduced to 21 cells and no clock cycle delays. where as for full subtractor we used a XOR logic to reduce number of cells to 20 cells. resulted decreasing the area occupation and clock delay.

    Keyword

    QCA technology, Majority gate, Multiplexer, Full adder, Full subtractor.


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