An NCL-HDL Snake-Clock-Based Magnetic QCA Architecture

Graziano, Mariagrazia; Vacca, Marco; Chiolerio, Alessandro; Zamboni, Maurizio

doi:10.1109/tnano.2011.2118229

Cited by 66 publications

(64 citation statements)

References 24 publications

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“…The clock consists in an electric field that can move the charge to the NULL dot, making the adiabatic propagation possible. The in-depth analysis of the clock issue is out of the scope of this paper; we then refer to the literature for any further explanation [13,14].…”

Section: Background: Molecular Qcamentioning

confidence: 99%

Effectiveness of Molecules for Quantum Cellular Automata as Computing Devices

Ardesi

Pulimeno

Graziano

et al. 2018

JLPEA

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Notwithstanding the increasing interest in Molecular Quantum-Dot Cellular Automata (MQCA) as emerging devices for computation, a characterization of their behavior from an electronic standpoint is not well-stated. Devices are typically analyzed with quantum physics-based approaches which are far from the electronic engineering world and make it difficult to design, simulate and fabricate molecular devices. In this work, we define new figures of merits to characterize the molecules, which are based on the post-processing of results obtained from ab initio simulations. We define the Aggregated Charge (AC), the electric-field generated at the receiver molecule (EFGR), the Vin-Vout and Vin-AC transcharacteristics (VVT and VACT), the Vout maps (VOM) and the MQCA cell working zones (CWZ). These quantities are compatible with an electronic engineering point of view and can be used to analyze the capability of molecules to propagate information. We apply and verify the methodology to three molecules already proposed in the literature for MQCA and we state to which extent these molecules can be effective for computation. The adopted methodology provides the quantitative characterization of the molecules necessary for digital designers, to design digital circuits, and for technologists, to the future fabrication of MQCA devices.

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Section: Background: Molecular Qcamentioning

confidence: 99%

Effectiveness of Molecules for Quantum Cellular Automata as Computing Devices

Ardesi

Pulimeno

Graziano

et al. 2018

JLPEA

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“…2.B. It is called snake clock and is thoroughly described in [6]. Clock phases are 3 and clock wires are alternatively placed above and under magnets plane.…”

Section: B Magnetic Clock Gfmmentioning

confidence: 99%

A standard cell approach for MagnetoElastic NML circuits

Giri

Vacca

Causapruno

et al. 2014

Proceedings of the 2014 IEEE/ACM International Symposium on Nanoscale Architectures

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Among emerging technologies Quantum dot Cellular Automata (QCA) plays a fundamental role. Its magnetic version, normally called NanoMagnet Logic (NML), is particularly interesting thanks to the ability to work at room temperature and to mix logic and memory in the same device. Magnetic circuits have also a potential very low power consumption. Unfortunately classic NML circuits are normally driven (clocked) with a current generating a clocked magnetic field, nullifying the possibility to actually obtain low power circuits.We have recently developed a technology-friendly solution, the MagnetoElastic NML (ME-NML), where magnetic circuits are driven through an electric field, and not with a current, drastically reducing the power consumption. In this paper we start to explore the architectural consequences of this new magnetic technology. The analysis is performed using as a benchmark a Galois multiplier, a systolic architecture particularly suited for QCA and NML technologies. The layout is precisely described and the resulting circuit is modeled and simulated using VHDL language. The obtained results are remarkable. The circuit area is reduced by 4 times compared to classic NML approach. This, coupled with the intrinsic lower power consumption due to different clock, leads to a 50 times reduction of power absorption. Moreover the particular structure of magnetoelastic NML allows to define a library of standard cells that can be easily used by designers and automatic layout tools to design circuits, greatly improving future research in this field.

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“…Recent studies [Hutchby et al 2008;Pulimeno et al 2011;Graziano et al 2011aGraziano et al , 2011bChiolerio et al 2012] suggest that few of them will really outlive and be adopted as feasible solutions. In most of the cases nanowire arrays [Lu and Lieber 2006] are the common structures, often organized in matrices [Luo et al 2002;Motto et al 2012;Crepaldi et al 2013].…”

Section: Background and Perspectivesmentioning

confidence: 99%

Nanoarray architectures multilevel simulation

Frache

Graziano

Zamboni

2014

J. Emerg. Technol. Comput. Syst.

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Density and regularity are deemed as the major advantages of nanoarray architectures based on nanowires. Literature demonstrated that proper reliability analyzes must be performed and solutions have to be devised to improve nanoarrays yield. Their complexity and high-fault probability claim for specific design automation tools able to explore circuit solutions, performance and fault-tolerant approaches.We envision a simulator conceived to carry on characterizations in terms of logic behavior, defect-induced output error rate assessment, switching activity, power and timing performance. Though already existing for traditional technology, a simulator based on specific technological and topological tiled nanoarray descriptions, and conceived to join both device and architecture levels, has never been attempted at the degree of accuracy we present.Our contribution is twofold. First, marking a difference with respect to the state of the art, we developed an algorithm based on an event-driven engine which works at switch level and is not simply built on top of cost functions evaluations. The straightforward advantage is the possibility to follow the evolution of dynamic control sequences throughout all the inner components of the nanoarray, and, as a consequence, to obtain circuit level characterization as a projection of the real internal parameters.Second, we added to our simulator the capability to inject faults with specific statistical distributions associated to the nanoarray topology. Here we extract output error rates and yield for one of the possible nanoarray structures proposed in literature, the NASIC. Results specificity and accuracy demonstrate the simulator trustworthiness, its effectiveness for extensive nanoarrays characterization and its suitability as a foundation for both higher architectural and lower device simulation levels.The aim of this work, then, is to provide insights into the intertwined relation between actual technology and circuit design for these emerging fabrics, and, as a consequence, to clarify how defects and variability affect circuits and systems performance. ACM Reference Format:Frache, S., Graziano, M., and Zamboni, M. 2014. Nanoarray architectures multilevel simulation. ACM J.

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An NCL-HDL Snake-Clock-Based Magnetic QCA Architecture

Cited by 66 publications

References 24 publications

Effectiveness of Molecules for Quantum Cellular Automata as Computing Devices

Effectiveness of Molecules for Quantum Cellular Automata as Computing Devices

A standard cell approach for MagnetoElastic NML circuits

Nanoarray architectures multilevel simulation

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