Patent ID: 6873828

Claim:
A compound semiconductor switching device comprising: a first FET comprising signal electrodes and a gate electrode formed on a surface of a channel layer of said first FET, the signal electrodes of the first FET not being connected to each other; a second FET comprising signal electrodes and a gate electrode formed on a surface of a channel layer of said second FET, the signal electrodes of the second FET not being connected to each other; a common input terminal, said common input terminal being formed by connecting one of the signal electrodes of the first FET and one of the signal electrodes of the second FET; a first output terminal, said first output terminal being the signal electrode of the first FET not used as the common input terminal; and a second output terminal, said second output terminal being the signal electrode of the second FET not used as the common input terminal; wherein the gate electrodes of the first and second FET's are provided with control signals such that only one FET allows conduction of electric current so that a signal pass is formed between the common input terminal and either the first output terminal or the second output terminal; and wherein the first FET and the second FET have gate widths of about 700 μm or less and are not connected to a shunt FET.