Patent ID: 7875938

Claim:
A lateral double diffused metal oxide semiconductor (LDMOS) device, comprising: a substrate of a first conductivity type; a source region and a drain region in the substrate said source region and said drain region are of a second conductivity type opposite to said first conductivity type, one of said drain region and said source region inside a first well region of said second conductivity type in the substrate, another of said drain region and said source region inside a second well region of said first conductivity type in the substrate; an insulating layer provided on a portion of the substrate between said source region and said drain region, such that a planar interface is provided between said insulating layer and a surface of the substrate, said insulating layer above said first well region and above said second well region; a first insulating member on a portion of said insulating layer, said first insulating member overlying the first well region without extending out of the first well region; a second insulating member on another portion of said insulating layer overlying the first well region without extending out of the first well region; a gate layer over part of said first insulating member, part of said second insulating member, and part of said insulating layer wherein the second insulating member is a sidewall spacer located adjacent to at least one side wall of the first insulating member to form a transition surface for the gate layer between the insulating layer and the first insulating member.