Patent ID: 8653558

Claim:
A metal insulator semiconductor heterostructure field effect transistor (MISHFET), comprising: a source and a drain on opposing sides of a channel region of a channel layer, wherein the channel region is an upper portion of the channel layer, wherein the channel layer comprises gallium nitride; a first insulation layer over the channel layer, a second insulation layer over the first insulation layer, the first and second insulation layers each having a first portion and a second portion, wherein the first portion is nearer the drain than the source and has a first thickness, the second portion is nearer the source than drain and has the first thickness, the first and second insulation layers having an opening through the first and second insulation layers and between the first portion and the second portion, wherein the opening extends to the top surface of the channel layer and has a bottom over the channel; a gate dielectric on the bottom of the opening; a gate dielectric on a bottom of the opening; and a gate on the gate dielectric in the opening.