Patent ID: 6833586
Filing Date: 2004-12-21
Classification: H01L

Abstract:
A transistor, comprising:a semiconductor layer of a first conductivity type; a first well of a second conductivity type formed in the semiconductor layer, the first well forming a body region of the transistor; a field oxide layer formed on the top surface of the semiconductor layer, a portion of the field oxide layer being formed over the first well and remaining portions of the field oxide layer being formed over the semiconductor layer on either side of the first well, the field oxide layer forming a gate dielectric layer of the transistor; a conductive gate formed over the field oxide layer and located above the first well; a first region of the first conductivity type formed in the semiconductor layer abutting a first edge of the field oxide layer; and a second region of the first conductivity type formed in the semiconductor layer abutting a second edge of the field oxide layer opposite the first edge, wherein a first drift region between the body region and the first region is formed in the semiconductor layer underlying the field oxide layer between a first edge of the first well to the first edge of the field oxide layer; and wherein a second drift region between the body region and the second region is formed in the semiconductor layer underlying the field oxide layer between a second edge of the first well, opposite the first edge of the first well, to the second edge of the field oxide layer.