Patent ID: 9245996
Filing Date: 2016-01-26
CPC Classification: H01L

Claim Text:
1. A lateral double-diffused metal-oxide-semiconductor (LDMOS) transistor device comprising: a substrate comprising a first insulating structure formed therein; a gate formed on the substrate and covering a portion of the first insulating structure; a drain region and a source region formed in the substrate at two respective sides of the gate, the drain region and the source region comprising a first conductivity type; a base region encompassing the source region, the base region comprising a second conductivity type complementary to the first conductivity type; a drift region encompassing the drain region, the drift region comprising the first conductivity type and being spaced apart from the base region; and a doped layer formed under the base region, the doped layer comprising the second conductivity type, wherein a top of the doped layer contacts a bottom of the base region, and a width of the doped layer is larger than a width of the base region.