US RFMD Chip Company RF Micro Devices was founded in 1991. The head office is located in North Carolina (Greensboro, NC) and listed on the NASDAQ in 1997. The average annual R&D expenditure accounts for about 25% of the total turnover. It was established by a group of R&D teams specialized in radio frequency design. The design engineer specializes in radio communications. RF integrated circuit design experience averages over 25 years. Over the years, design engineers accounted for 28% of the company's total number is about 1,400 currently.