Quantance, a San Mateo, Calif.-based chip firm, has raised a $12 million second round of funding to build a component part that will improve cell phone data reception by boosting the signal the phone sends to the base station. The funding, led by the TD Fund, with DoCoMO Capital, Granite Ventures and InterWest Partners also participating, supports Quantance’s efforts to manufacture and market its analog chip. The involvement of DOCOMO Capital, the venture arm of the Japanese cell phone giant, could help boost Quantance’s acceptance in the handset market if NTT DOCOMO pushes the chip for its own handsets.