Abstract
Quantum-dot cellular automata (QCA) technology is considered to be a possible alternative for circuit implementation in terms of energy efficiency, integration density and switching frequency. Multiplexer (MUX) can be considered to be a suitable candidate for designing QCA circuits. In this paper, two different structures of energy-efficient 2×1 MUX designs are proposed. These MUXes outperform the best existing design in terms of power consumption with approximate reductions of 26% and 35%. Moreover, similar or better performance factors such as area and latency are achieved compared to the available designs. These MUX structures can be used as fundamental energy-efficient building blocks for replacing the majority-based structures in QCA. The scalability property of the proposed MUXes is excellent and can be used for energy-efficient complex QCA circuit designs.
Highlights
Designing low-power circuits in nanoscale has been a promising area of research among scientists for a long time
As complementary metal-oxide semiconductor (CMOS) technology reaches its physical limitation [1], several nanotechnologies have been considered to be possible alternatives for CMOS to implement binary and multiple-valued logic circuits [2,3,4,5,6]. One of these nanotechnologies that is expected to provide the implementation of low-power, high-density, and high-speed integrated digital circuits is quantum-dot cellular automata (QCA) [7,8,9,10,11,12]
Many studies have been conducted on developing different QCA designs for various fundamental digital circuits such as Multiplexer (MUX) [13,14,15,16,17,18,19,20,21,22], XOR/XNOR [23], arithmetic circuits [24,25,26,27,28], memory [18], reversible gate [29], etc
Summary
Designing low-power circuits in nanoscale has been a promising area of research among scientists for a long time. As complementary metal-oxide semiconductor (CMOS) technology reaches its physical limitation [1], several nanotechnologies have been considered to be possible alternatives for CMOS to implement binary and multiple-valued logic circuits [2,3,4,5,6]. One of these nanotechnologies that is expected to provide the implementation of low-power, high-density, and high-speed integrated digital circuits is quantum-dot cellular automata (QCA) [7,8,9,10,11,12]. Several studies have been conducted on developing other QCA structures as alternatives for the majority logic gate for specific functions such as MUX, XOR, XNOR, Reversible gates, Flip Flops, etc
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