Cavity formation in interface layer in semiconductor devices
First Claim
1. A method for fabricating a radio-frequency device, the method comprising:
- providing a field-effect transistor;
forming one or more electrical connections to the field-effect transistor;
forming one or more dielectric layers over at least a portion of the electrical connections;
disposing an electrical element at least partially above the one or more dielectric layers, the electrical element being in electrical communication with the field-effect transistor via the one or more electrical connections;
applying an interface material over at least a portion of the one or more dielectric layers;
removing at least a portion of the interface material to form a trench above at least a portion of the electrical element; and
covering at least a portion of the interface material and the trench with a substrate layer to form a cavity, the electrical element being disposed at least partially within the cavity.
1 Assignment
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Accused Products
Abstract
Fabrication of radio-frequency (RF) devices involves providing a field-effect transistor (FET), forming one or more electrical connections to the FET, forming one or more dielectric layers over at least a portion of the electrical connections, and disposing an electrical element at least partially above the one or more dielectric layers, the electrical element being in electrical communication with the FET via the one or more electrical connections. RF device fabrication further involves applying an interface material over at least a portion of the one or more dielectric layers, removing at least a portion of the interface material to form a trench above at least a portion of the electrical element, and covering at least a portion of the interface material and the trench with a substrate layer to form a cavity, the electrical element being disposed at least partially within the cavity.
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Citations
19 Claims
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1. A method for fabricating a radio-frequency device, the method comprising:
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providing a field-effect transistor; forming one or more electrical connections to the field-effect transistor; forming one or more dielectric layers over at least a portion of the electrical connections; disposing an electrical element at least partially above the one or more dielectric layers, the electrical element being in electrical communication with the field-effect transistor via the one or more electrical connections; applying an interface material over at least a portion of the one or more dielectric layers; removing at least a portion of the interface material to form a trench above at least a portion of the electrical element; and covering at least a portion of the interface material and the trench with a substrate layer to form a cavity, the electrical element being disposed at least partially within the cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio-frequency device comprising:
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a field-effect transistor implemented over an oxide layer; one or more electrical connections to the field-effect transistor; one or more dielectric layers formed over at least a portion of the electrical connections; an electrical element disposed over the one or more dielectric layers, the electrical element being in electrical communication with the field-effect transistor via the one or more electrical connections; an interface layer covering at least a portion of the one or more dielectric layers, the interface layer having a trench therein above at least a portion of the electrical element; and a substrate layer covering at least a portion of the interface layer and the trench to form a cavity, the electrical element being disposed at least partially within the cavity. - View Dependent Claims (10, 11, 12)
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13. A wireless device comprising:
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a transceiver configured to process radio-frequency signals; a radio-frequency module in communication with the transceiver, the radio-frequency module including a switching device having a field-effect transistor implemented over an oxide layer, the switching device further including one or more electrical connections to the field-effect transistor, one or more dielectric layers formed over at least a portion of the electrical connections, an electrical element disposed over the one or more dielectric layers that is electrically coupled to the field-effect transistor via the one or more electrical connections, an interface layer covering at least a portion of the one or more dielectric layers and having a trench therein above the at least a portion of the electrical element, and a substrate layer covering at least a portion of the interface layer and the trench to form a cavity, the electrical element being disposed at least partially within the cavity; and an antenna in communication with the radio-frequency module, the antenna configured to facilitate transmitting and/or receiving of the radio-frequency signals. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification