Peregrine Semiconductor, known as pSemi, is a San Diego-based manufacturer of high-performance RF (radio frequency) CMOS integrated circuits. A Murata Manufacturing company since December 2014, the company's products are used in aerospace and defense, broadband, industrial, mobile wireless device, test and measurement equipment and wireless infrastructure markets. Their UltraCMOS technology is a proprietary implementation of silicon on sapphire (SOS) and silicon on insulator (SOI) substrates that enables high levels of monolithic integration.