Quantum-Dot Cellular Automata (QCA) is one of several proposed computational nanotechnology paradigms
that are being investigated as alternatives to CMOS at the nano-scale. QCA has been reported to offer relatively
low power consumption, and very high device density. In recent years, several researchers have started investigating
relatively complex circuit architectures using QCA. Such design efforts have highlighted the crosstalk
problem in QCA and the lack of research in this area. This paper explores the nature of crosstalk in QCA. We
show how crosstalk can be amplified due to several parameters including wire length and the distance between
adjacent cells. We develop a model and method that allows us to test for crosstalk using a set of test vectors.
We also propose a set of cell placement guidelines and design geometries that help to minimize QCA crosstalk
in large circuits.
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