Stacked channel heterojunction fet.

摘要

A field effect transistor comprising a high electron mobility field effect transistor (HEMT) portion and a metal-Schottky-gate field effect transistor (MESFET) portion having respective channel layers (10, 22) controlled by a common gate (26). At microwave and higher radio frequencies, the drain current capability of the HEMT portion reaches an upper limit; the MESFET portion takes over to provide drain current capability greater than this limit.