Texas Instruments Corporation

Triquint Semiconductors Texas, Inc.

Thomas E Nagle

Clyde R Fuller

Joseph B Delaney

Glen R Haas

Generally, and in one form of the invention, a method is disclosed for forming an ohmic contact on a GaAs surface,comprising the steps of depositing a layer of InGaAs,over the GaAs surface,, and depositing a layer of TiW,on the layer of InGaAs,, whereby a reliable and stable electrical contact is established to the GaAs surface,and whereby Ti does not generally react with the In.

Method of forming a low-resistance contact on compound semiconductor

Generally, and in one form of the invention, a method is disclosed for forming an ohmic contact on a GaAs surface 20 comprising the steps of depositing a layer of InGaAs 22 over the GaAs surface 20, and depositing a layer of TiW 24 on the layer of InGaAs 22, whereby a reliable and stable electrical contact is established to the GaAs surface 20 and whereby Ti does not generally react with the In.

Low-resistance contact on a compound semiconductor

In one form of the invention, an Electrostatic Discharge protection device containing at least one heterojunction transistor is disclosed. In another embodiment, an Electrostatic Discharge protection circuit comprises: a first terminal contact 20; an NPN heterojunction bipolar transistor Q2; a PNP bipolar transistor Q1; a base-emitter shunt resistor R2; an emitter of said PNP transistor connected to said first terminal contact; a base of said PNP transistor connected to collector of said NPN transistor; a collector of said PNP transistor connected to a base of said NPN transistor; and an emitter of said NPN transistor connected to a second terminal contact 22, with said base-emitter shunt resistor connected between said base of said NPN transistor and an emitter of said NPN transistor, whereby a low-capacitance device capable of protecting semiconductor devices from electrostatic discharges in excess of 4000 Volts results. Other devices, systems, and methods are also disclosed.

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Dallas, TX, United States of America

Thomas E Nagle