Patent ID: 7473625

Claim:
A method of fabricating a lateral double diffused metal oxide semiconductor (LDMOS) device, comprising steps of: providing a substrate including a first well having a first conductivity type and a second well having a second conductivity type; forming an insulating layer using a first process on a portion of the substrate, such that a planar interface is provided between said insulating layer and a surface of the substrate; forming an insulating member using a second process different than the first process, on a portion of said insulating layer having first and second sides over the second well; forming a spacer on the first side of the insulating member to form a transition surface for a gate member, comprising: (i) depositing a layer of insulating material over the insulating layer and insulating member; and (ii) performing an etching process to form the spacer; forming the gate member having a second side over part of said insulating member and a first side over said insulating layer over the first well; and forming a source region having the second conductivity type in the first well aligned with the first side of the gate member, and a drain region having the second conductivity type in the second well adjacent the second side of the insulating member such that said portion of the substrate on which the insulating layer is formed lies between said source region and said drain region.