Affiliation:
1. School of Electronics & Communication Engineering, Shri Mata Vaishno Devi University, Katra, India
Abstract
Background::
Quantum-dot Cellular Automata (QCA) is a new emerging nanotechnology
that has been proven to be an improved alternative to complementary metal oxide semiconductor
(CMOS) technology. It consists of a group of cells that can perform computational functions when
combined and arranged in a particular manner.
Objective::
The Flip-Flops are widely affiliated with the circuits of logical and arithmetic unit structures
that are used for the processors. Data (D) Flip-Flop is the most important and widely used Flip-Flop
among all different types due to its better performance and efficiency. Hence, an efficient D Flip-Flop
needs to be developed using QCA nanotechnology.
Method::
This paper proposes a new design for D Flip-Flop in QCA nanotechnology. The proposed D
Flip-Flop has 28 quantum cells and covers an area of 0.03 μm2 . Furthermore, the paper presents a new
design for a 3-bit Shift Register using the proposed D Flip-Flops in QCA nanotechnology keeping in
mind the importance of the same in storing and transferring multiple bits of data.
Result::
The proposed D Flip-Flop and the 3-bit Shift Register are compared with the existing QCAbased
designs. The proposed Shift Register has 100 quantum cells and covers an area of 0.11 μm2 .
Conclusion::
The comparison concludes that the proposed D Flip-Flop and the 3-bit Shift Register
have used a lesser number of QCA cells and covered smaller areas than the previous works. The proposed
designs have been designed in a single layer without any crossover.
Publisher
Bentham Science Publishers Ltd.
Subject
General Engineering,General Materials Science