Patent ID: 7394131

Claim:
A semiconductor device including a silicon-on-insulator (SOI) region and a bulk silicon region, the semiconductor device comprising: a plurality of silicon trench isolation (STI), each of the plurality of STI extending to a depth equal to a thickness of a silicon layer and a buried insulator of the SOI region, wherein at least one of the plurality of STI is formed within the SOI region; wherein at least one of the plurality of STI is formed within the bulk silicon region; wherein the at least one of the plurality of STI formed within the SOI region is away from a boundary between the SOI region and the bulk silicon region; wherein the at least one of the plurality of STI formed within the bulk silicon region is away from a boundary between the SOI region and the bulk silicon region; and wherein at least one of the plurality of STI formed within the bulk silicon region is disposed above a deep trench in the bulk silicon region.