Silicon-on-insulator (SOI) CMOS offers a 20–35% performance gain over bulk CMOS. High-performance microprocessors using SOI CMOS have been commercially available since 1998. As the technology moves to the 0.13m generation, SOI is being used by more companies, and its application is spreading to lower-end microprocessors and SRAMs. In this paper, after giving a short history of SOI in IBM, we de...