Abstract
The continuous market demands for high performance and energy-efficient computing systems have steered the computational paradigm and technologies towards nanoscale quantum-dot cellular automata (QCA). In this paper, novel energy- and area-efficient QCA-based adder/subtractor designs have been proposed. First, a QCA-based 3-input XOR gate is designed and then a full adder and a full subtractor are realized. The power consumption of the proposed design was tested via the QCAPro estimator tool with different kind of energy (γ = 0.5 Ek, γ = 1.0 Ek, and γ = 1.5 Ek) at temperature T = 2 in Kelvin. QCADesigner 2.0.03 software was applied to evaluate the simulation results of the proposed designs. The proposed design has better complexity than the conventional designs in terms of cell count, area, and power dissipation.
Highlights
Over the past few decades, the microelectronics industry has been driven by increasing market demands for enhanced integration, energy efficiency, and speed of integrated circuits (ICs) [1–4]
Traditional Complementary Metal Oxide Semiconductor (CMOS) based transistors cannot be reduced much smaller than their current size, due to current leakage problems arising from quantum mechanically tunneling, so the device cannot be switched off properly and increased heat dissipation, which threatens to melt the chip. is fact has pushed designers to search for new technologies to allow greater integration and lower power consumption for Digital Signal Processor (DSP) IC applications
The quantum-dot cellular automata (QCA) majority voter gate contains five cells forming a cross with a cell in the center as a device cell, three cells as its inputs, and one cell as its output. e device cell polarity is determined based on Coulomb repulsion of the three inputs and the polarity is transferred to the output
Summary
Over the past few decades, the microelectronics industry has been driven by increasing market demands for enhanced integration, energy efficiency, and speed of integrated circuits (ICs) [1–4]. Quantum-dot cellular automata (QCA) is one of the most promising solutions to design ultralow power and very-high-speed digital circuits, which can be scaled down to the molecular nanoscale device level [6]. It is an up-and-coming nanotechnology with strong prospects to supplement and possibly replace the current CMOS technology [7–9]. E main concern of this paper is to present a new design of 1-bit full adder and 1-bit full subtractor based on QCA technology, which yields significant reduction in terms of cell count, area, and energy dissipation.
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