Designing Partially Reversible Field-Coupled Nanocomputing Circuits

Chaves, Jeferson F.; Ribeiro, Marco A.; Torres, Frank Sill; Neto, Omar P. Vilela

doi:10.1109/tnano.2019.2918057

Cited by 8 publications

(2 citation statements)

References 32 publications

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“…To execute the hybrid design strategy, we first developed an innovative, partially reversible majority gate. Only a few previous studies have investigated the partially reversible design concept [21][22][23]. In 2011, Ottavi et al introduced a partially reversible method to balance the energy dissipation, delay time, and area used through the inclusion of memory stages and a control mechanism, which resembled a pipeline [21].…”

Section: Hybrid Design Methodsmentioning

confidence: 99%

“…However, this strategy is less efficient when more pipeline clock zones are utilised [22]. In 2019, Chaves et al presented an alternative approach to designing partially reversible circuits in FCN technologies by considering layout alterations rather than timing modifications [23]. This approach relies on recycling one input signal for the logic gate.…”

Section: Hybrid Design Methodsmentioning

confidence: 99%

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Hybrid Quantum-Dot Cellular Automata Nanocomputing Circuits

Alharbi,

Edwards,

Stocker

2024

Preprint

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Quantum-dot cellular automata (QCA) is an emerging transistor-less field-coupled nanocomputing (FCN) approach to ultra-scale ‘nanochip’ integration. In QCA, to represent digital circuitry, electrostatic repulsion between electrons and the mechanism of electron tunnelling in quantum dots are used. QCA technology can surpass conventional complementary metal-oxide semiconductor (CMOS) technology in terms of clock speed, reduced occupied chip area, and energy efficiency. To develop QCA circuits, irreversible majority gates are typically used as the primary components. Recently, some studies have introduced reversible design techniques, using reversible majority gates as the main building block, to develop ultra-energy efficient QCA circuits. However, this approach resulted in time delays, an increase in the number of QCA cells used, and an increase in the chip area occupied. This work introduces a novel hybrid design strategy employing QCA irreversible, reversible, and partially reversible gates to establish an optimal balance between power consumption, delay time, and occupied area. The hybrid technique allows the designer to have more control over the circuit characteristics to meet different system needs. A combination of reversible, irreversible, and innovative partially reversible majority gates is used in the proposed hybrid design method. We have evaluated the hybrid design method by examining the half-adder circuit as a case study. We have developed four hybrid QCA half-adder circuits, each of which simultaneously incorporates various types of majority gates. The QCADesigner-E 2.2 simulation tool was used to simulate the performance and energy efficiency of the half-adders. This tool provides numerical results for the circuit input/output response and heat dissipation at the physical level, within a microscopic quantum mechanical model.

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