Vertically integrated sensor structure and method
First Claim
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1. A vertically integrated sensor device comprising:
- a base substrate having a first major surface, a second major surface opposite the first major surface, and a cavity extending from the second major surface to form a diaphragm, and wherein the base substrate comprises a semiconductor material;
a transducer formed on the diaphragm;
a cap substrate having a third major surface and a fourth major surface opposite the third major surface, wherein the third major surface is connected to the first major surface to provide a hermetically sealed chamber, and wherein the cap substrate comprises a semiconductor material; and
an electronic device formed on the fourth major surface, wherein the electronic device is electrically coupled to the transducer.
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Abstract
A vertically integrated sensor structure (60) includes a base substrate (71) and a cap substrate (72) bonded to the base substrate (71). The base substrate (71) includes a transducer (78) for sensing an environmental condition. The cap substrate (72) includes electronic devices (92) formed on one surface to process output signals from the transducer (78). The sensor structure (60) provides an integrated structure that isolates sensitive components from harsh environments.
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Citations
23 Claims
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1. A vertically integrated sensor device comprising:
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a base substrate having a first major surface, a second major surface opposite the first major surface, and a cavity extending from the second major surface to form a diaphragm, and wherein the base substrate comprises a semiconductor material; a transducer formed on the diaphragm; a cap substrate having a third major surface and a fourth major surface opposite the third major surface, wherein the third major surface is connected to the first major surface to provide a hermetically sealed chamber, and wherein the cap substrate comprises a semiconductor material; and an electronic device formed on the fourth major surface, wherein the electronic device is electrically coupled to the transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A media compatible vertically integrated absolute pressure sensor structure comprising:
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a first substrate comprising a semiconductor material and having a first cavity extending from a first surface to form a diaphragm; a transducer formed on a second surface of the first substrate, the transducer providing an output signal when the first cavity is exposed to an environmental condition; a second substrate comprising a semiconductor material and having a third surface and a fourth surface opposite the third surface, wherein the third surface is attached to the second surface such that a sealed chamber is formed above the diaphragm; an integrated circuit device formed on the fourth surface, wherein the integrated circuit device is coupled to the first substrate for receiving the output signal from the transducer; and a chip carrier having a pressure port, wherein the first substrate is coupled to the chip carrier such that the first cavity is in a spaced relationship with the pressure port. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for forming a vertically integrated sensor device comprising the steps of:
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forming a first cavity in a base substrate, wherein the base substrate includes a first major surface and a second major surface, and wherein the first cavity extends from the first major surface to provide a diaphragm, and wherein the base substrate is comprised of a semiconductor material; forming a transducer on the diaphragm; forming an electronic device on a cap substrate, wherein the cap substrate includes a third major surface and a fourth major surface, wherein the electronic device is formed on the fourth major surface, and wherein the cap substrate is comprised of a semiconductor material; attaching the cap substrate to the base substrate to provide a hermetically sealed chamber above the transducer; attaching the base substrate to a chip carrier, wherein the chip carrier includes an opening, and wherein the first cavity is in a spaced relationship with the opening; and coupling the transducer to the electronic device. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification