The Wall Street Journal reports that chipmaker Infineon swung to a net profit in the fiscal first quarter on growing demand for its logic chips and raised its guidance for 2010, becoming the latest European technology company to beat expectations and confirm a rebound in the sector. The German company said Friday it now forecasts sales in the year ending Sept. 30 to rise more than 20 percent from a year earlier, up from its previous expectation for sales to climb more than 10 percent. It also raised its operating-margin target to a high-single-digit range from a mid-single-digit range.