Patent ID: 8878275

Claim:
A laterally diffused metal oxide semiconductor (LDMOS) transistor, comprising: a source region disposed in a semiconductor substrate; a drain region disposed in the semiconductor substrate; a channel region disposed in the semiconductor substrate between the source region and the drain region; a drift region disposed in the semiconductor substrate between the channel region and the drain region; a field dielectric plate disposed on the semiconductor substrate over at least a portion of the drift region; and a gate electrode disposed on at least a portion of the field dielectric plate, the field dielectric plate including: a first portion having a surface in contact with the gate electrode, the surface of the first portion having a first slope relative to a surface of the semiconductor substrate; and a second portion disposed on the first portion and having a surface in contact with the gate electrode, the surface of the second portion having a second slope relative to the surface of the semiconductor substrate, the second slope being different than the first slope.