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Efficient Design of a Hybrid Adder in Quantum-Dot Cellular Automata

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2 Author(s)
Pudi, V. ; Dept. of Electr. Eng., Indian Inst. of Technol. Madras, Chennai, India ; Sridharan, K.

This paper first presents an efficient quantum-dot cellular automata (QCA) design for the Ladner-Fischer prefix adder. We then present an efficient QCA design of a hybrid adder that combines the Ladner-Fischer adder with a ripple carry adder. We show that the hybrid adder has better performance (in terms of latency) in QCA than a Ladner-Fischer or a ripple carry adder. We also show that the hybrid adder has a smaller area-delay product than existing adder designs in QCA. Results of simulation in QCADesigner are also given and they support the theory presented.

Published in:

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:19 ,  Issue: 9 )

Date of Publication:

Sept. 2011

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