By Milana Vinn Feb 3 (Reuters) - Texas Instruments is in advanced talks ​to buy chip designer Silicon Laboratories ‌for about $7 billion, a source familiar with ‌the matter told Reuters on Tuesday. A deal could be announced in the coming days, the source said. Shares of Silicon ⁠Laboratories, which ‌has a market value of about$4.71 billion, surged about 34% ‍in extended trading after the Financial Times newspaper first reported the news. Texas Instruments ​shares were down 2.4%. Texas Instruments ‌a ...