Compound semiconductor switching device for high frequency switching
First Claim
Patent Images
1. 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 μ
m or less and are not connected to a shunt FET.
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Abstract
A compound semiconductor switching device is based on a designing guideline that isolation should be assured by reducing the gate width of switching FET, thereby reducing the capacitance of the FET. Proper isolation between the two signal passes IS obtained with a FET gate width of about 700 μm or smaller at a signal frequency of about 2.4 GHz or higher, without employing a shunt FET.
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Citations
11 Claims
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1. A compound semiconductor switching device comprising:
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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 μ
m or less and are not connected to a shunt FET. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile communication device, comprising:
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an antenna for receiving and sending an electromagnetic signal;
a signal receiving circuit for receiving the signal through the antenna;
a signal transmitting circuit for sending the signal through the antenna; and
at least one compound semiconductor switching device, said compound semiconductor switching devices 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;
the gate electrodes of the first and second FET'"'"'s being 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
the first FET and the second FET having gate widths of about 700 μ
m or less and not being connected to a shunt FET;
wherein the compound semiconductor devices are configured within the mobile communication device for switching between the signal receiving circuit and the signal transmitting circuit. - View Dependent Claims (10, 11)
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Specification