Tech stocks are flying high again. During the past three months, none has climbed higher than NXP Semiconductors (NASDAQ: NXPI), the leading maker of near field communications chips that turn cell phones into digital wallets. Shares of the Netherlands-based company have climbed 130 percent during that period, more than any publicly traded stock in the world with a market capitalization of at least $2 billion, tech stock or otherwise. [Read more…]