Patent ID: 7408223

Claim:
An insulated gate field effect transistor, comprising: a source region of first conductivity type; a body region of second conductivity type opposite to the first conductivity type adjacent to the source region; a sub-channel region of second conductivity type adjacent to the body region, wherein the doping in the body region is at least five times higher than the doping in the sub-channel region; a drain region of first conductivity type adjacent to the sub-channel region, so that body and sub-channel regions are arranged between the source and drain regions; insulated trenches extending from the source region through the body region and the sub-channel region to the drain region, each trench having sidewalls, and including insulator on the sidewalls, at least one conductive gate electrode adjacent to the body region, and at least one conductive field plate electrode adjacent to the sub-channel region; and a gate terminal connected to the gate electrodes and a field plate terminal connected to the field plate electrodes to independently control the voltages on the gate electrodes and field plate electrodes.