Eliminating wire crossings for molecular quantum-dot cellular automata implementation

Chaudhary, Amitabh; Chen, D.Z.; Hu, Xiaobo Sharon; Whitton, K.; Niemier, Mike; Ravichandran, Ramprasad

doi:10.1109/iccad.2005.1560130

Cited by 35 publications

(32 citation statements)

References 23 publications

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“…To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. sities that are 3-4 orders of magnitude beyond what endof-the-curve CMOS can provide [4], and should dissipate very little power (100 W if 10 12 devices in 1cm 2 switch simultaneously) [18]. Experiments have shown a molecule is capable of switching between configurations that represent binary 0 and 1 states.…”

Section: Introductionmentioning

confidence: 99%

“…The work presented here is related to the solution discussed in [4], but takes an important step back. In this paper we consider via a statistical mechanical analysis not just whether or not the structures required for the methods proposed in [4] will function properly, but whether or not a functionally complete logic set will function properly if existing devices and potential scaffoldings are used to build it.…”

Section: Introductionmentioning

confidence: 99%

“…According to [4], one consequence of this fabrication mechanism was that a co-planar wire crossings would be difficult to fabricate. The work of [4] was important as it showed that an alternative interconnection mechanism did not adversely affect area. As a result, the milestone of fabricating a co-planar wire crossing could be removed from the physical science critical path.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The authors of [4] looked at self-assembling systems based on the DNA tiles proposed by Seeman and Winfree. According to [4], one consequence of this fabrication mechanism was that a co-planar wire crossings would be difficult to fabricate. The work of [4] was important as it showed that an alternative interconnection mechanism did not adversely affect area.…”

Section: Introductionmentioning

confidence: 99%

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Using CAD to Shape Experiments in Molecular QCA

Niemier

Crocker

et al. 2006

2006 IEEE/ACM International Conference on Computer Aided Design

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This paper examines how circuits and systems made from molecular QCA devices might function. Our design constraints are "chemically reasonable" in that we consider the characteristics and dimensions of devices and scaffoldings (circuit boards to attach devices to) that have actually been fabricated (currently in isolation). We will show that not only is the work presented here a necessary first step for any work in QCA CAD, but also that by considering issues related to design can actually help shape experiments in the physical sciences for emerging, nano-scale devices. Our work shows that circuits, scaffoldings, substrates, and devices must all be considered simultaneously. Otherwise, there is a very real possibility that the devices and scaffoldings that are eventually manufactured will result in devices that only work in isolation. This work is especially timely as experimentalists are currently working to merge the different experimental tracks -i.e. to selectively place a QCA device.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Using CAD to Shape Experiments in Molecular QCA

Niemier

Crocker

et al. 2006

2006 IEEE/ACM International Conference on Computer Aided Design

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A signal distribution grid for quantum-dot cellular automata

2015

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On fault-tolerant design of Exclusive-OR gates in QCA

2017

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Design paradigms of logic circuits with Quantum-dot Cellular Automata (QCA) have been extensively studied in the recent past. Unfortunately, due to the lack of mature fabrication support, QCA-based circuits often suffer from various types of manufacturing defects and variations, and therefore, are unreliable and error-prone. QCA-based Exclusive-OR (XOR) gates are frequently used in the construction of several computing subsystems such as adders, linear feedback shift registers, parity generators and checkers. However, none of the existing designs for QCA XOR gates have considered the issue of ensuring fault-tolerance. Simulation results also show that these designs can hardly tolerate any fault. We investigate the applicability of various existing fault-tolerant schemes such as triple modular redundancy (TMR), NAND multiplexing, and majority multiplexing in the context of practical realization of QCA XOR gate. Our investigations reveal that these techniques incur prohibitively large area and delay and hence, they are unsuitable for practical scenarios. We propose here realistic designs of QCA XOR gates (in terms of area and delay) with significantly high fault-tolerance against all types of cell misplacement defects such as cell omission, cell displacement, cell misalignment and extra/additional cell deposition. Furthermore, the absence of any crossing in the proposed designs facilitates low-cost fabrication of such systems.

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Eliminating wire crossings for molecular quantum-dot cellular automata implementation

Cited by 35 publications

References 23 publications

Using CAD to Shape Experiments in Molecular QCA

Using CAD to Shape Experiments in Molecular QCA

A signal distribution grid for quantum-dot cellular automata

On fault-tolerant design of Exclusive-OR gates in QCA

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