Analysis of field-driven clocking for molecular quantum-dot cellular automata based circuits |
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Authors: | F Karim K Walus A Ivanov |
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Affiliation: | (1) Department of Computer Systems, Tampere University of Technology, P.O. Box 553, 33101 Tampere, Finland |
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Abstract: | Molecular quantum-dot cellular automaton (QCA) offers an alternative paradigm for computing at the nano-scale. QCA circuits
require an external clock which can be generated using a network of submerged electrodes to synchronize information flow and
provide the required power to drive the computation. In this paper, the effect of electrode separation and applied potential
on the likelihood of different QCA cell states of molecular cells located above and in between two adjacent electrodes is
analyzed. Using this analysis, estimates of operational ranges are developed for the placement, applied potential, and relative
phase between adjacent clocking electrodes to ensure that only those states that are used in the computation are energetically
favorable. Conclusions on the trade-off between cell size, cell-to-cell distance, and applied clocking potential are drawn
and the temperature dependence of the operation of fundamental QCA building blocks is considered. |
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