Patent ID: 8525257

Claim:
A laterally diffused metal oxide semiconductor (LDMOS) transistor comprising: a semiconductor layer of a first conductivity type formed over a semiconductor substrate; an asymmetric conductive spacer formed over the semiconductor layer, the asymmetric conductive spacer acting as a gate of the LDMOS transistor and being insulated from the semiconductor layer by a dielectric layer, wherein the asymmetric conductive spacer divides the semiconductor layer into a first region and a second region, and wherein a height of the asymmetric conductive spacer near the first region is less than the height near the second region; a well of a second conductivity type formed in the first region; a source region of the first conductivity type formed in the first region, the source region being partially in the well of the second conductivity type and partially underneath the asymmetric conductive spacer; a drain region of the first conductivity type formed in the second region; and a channel region of the second conductivity type formed in the semiconductor layer, the channel region being an implanted region formed under the asymmetric conductive spacer near the first region and being formed essentially completely under the asymmetric conductive spacer, the channel region having a depth that is greatest near the first region and decreases away from the first region.