Patent ID: 6479843
Filing Date: 2002-11-12
Classification: H01L,H03F,H03K

Abstract:
Apparatus for providing low voltage temperature compensation in a single power supply hetero-junction field effect transistor comprising:a substrate including a stack of epitaxially grown compound semiconductor layers formed thereon, the stack including a first epitaxially grown compound semiconductor layer; a hetero-junction field effect transistor formed in at least a first portion of the stack, the first portion including the first epitaxially grown compound semiconductor layer, the hetero-junction field effect transistor having a channel with source and drain ohmic contacts and a gate contact operatively associated with the channel, the gate contact including a plurality of layers of metal, the hetero-junction field effect transistor having a first turn-on voltage; and a Schottky diode formed in at least a second portion of the stack, the second portion including the first epitaxially grown compound semiconductor layer, the Schottky diode being adjacent the hetero-junction field effect transistor and with two terminals, the Schottky diode including one of the plurality of layers of metal positioned in contact with a layer of the stack having a low bandgap, the Schottky diode having a negative temperature coefficient and second turn-on voltage less than the first turn-on voltage.