Patent ID: 8575658

Claim:
A semiconductor device comprising: a compound semiconductor substrate; a first conductivity type-channel field-effect transistor region formed on the compound semiconductor substrate, and that includes a first channel layer; a first conductivity type first barrier layer that forms a heterojunction with the first channel layer, and supplies a first conductivity type charge to the first channel layer; and a second conductivity type gate region that has a pn junction-type potential barrier against the first conductivity type first barrier layer; and a second conductivity type-channel field-effect transistor region formed on the compound semiconductor substrate, and that includes a second conductivity type second channel layer, and a first conductivity type gate region that has a pn junction-type potential barrier against the second conductivity type second channel layer, wherein the first conductivity type-channel field-effect transistor region is a region that includes the second conductivity type second channel layer, a first conductivity type gate layer formed simultaneously with the first conductivity type gate region, the first channel layer, and the first conductivity type first barrier layer laminated in this order above the compound semiconductor substrate.