Optichron, a Fremont, Calif. chip company that removes “nonlinear” distortion from signaling systems in wireless telephony, WiMax and GPS, said it has raised $12 million more in financing.

It also appointed Thomas E. Carlson as chief financial officer. See the company’s full statement here.

Investors included US Venture Partners, TL Ventures, Battery Ventures, and VentureTech Alliance.

Total funding to date is $38 million.