The tech company looks poised to benefit from a smartphone upgrade cycle.Qualcomm (QCOM -1.53%) stock jumped after the company delivered strong fiscal fourth-quarter results last Wednesday although it remains well off the peak it hit in June. As of this writing, the stock is up by nearly 20% year to date.The semiconductor maker's performance has always been closely tied to conditions in the smartphone industry, and its revenue grew sharply in the quarter. It also announced a new $15 billion stock buyback pr ...