The rise of cloud computing and of powerful mobile devices like smartphones and tablet computers may seem like two distinct trends. But the two are, in reality, closely linked. And both are driving investment in gear made by companies like ASML (ASML), KLA-Tencor (KLAC) and Ultratech (UTEK) in order to produce advanced chips to run them. "Smartphones and tablets are driving the buildout of the cloud infrastructure," said Morningstar analyst Andy