Patent ID: 7557393

Claim:
A junction field-effect transistor, comprising: an active area comprising a semiconductor material, the active area at least partially surrounded by insulating material; a well region formed in said active area and doped to a first conductivity type; a channel region formed in said active area and doped to a second conductivity type and located so as to form a PN junction with said well region; a trench formed in said insulating material so as to expose at least a portion of a wall of said active area, including at least said PN junction; gate contact polysilicon filling said trench and doped with impurities of said first conductivity type; and a gate region abutting said channel region and doped with said first conductivity-type type impurities, said gate region in electrical contact with said gate contact polysilicon and extending along said exposed portion of said wall of said active area so as to make electrical contact with said PN junction.