Method for temperature compensation in MEMS resonators with isolated regions of distinct material
First Claim
1. A microelectromechanical system (MEMS) resonator device, comprising:
- at least one resonating member that includes a first material having one or more trenches defined therein, each of the trenches being at least partially filled with a second material that acts to modify the thermal coefficient of frequency (TCF) of the resonator device;
where the resonating member has a top surface, a bottom surface, and one or more sidewalls;
where each of the trenches extends through the first material from the top surface to the bottom surface of the resonator;
where each of the trenches is isolated by the first material from the sidewalls of the resonator such that no second material filling each trench is present at the sidewalls of the resonator; and
wherein the second material has a Young'"'"'s modulus temperature coefficient that is different from the Young'"'"'s modulus temperature coefficient of the first material.
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Accused Products
Abstract
MEMS resonators containing a first material and a second material to tailor the resonator'"'"'s temperature coefficient of frequency (TCF). The first material has a different Young'"'"'s modulus temperature coefficient than the second material. In one embodiment, the first material has a negative Young'"'"'s modulus temperature coefficient and the second material has a positive Young'"'"'s modulus temperature coefficient. In one such embodiment, the first material is a semiconductor and the second material is a dielectric. In a further embodiment, the quantity and location of the second material in the resonator is tailored to meet the resonator TCF specifications for a particular application. In an embodiment, the second material is isolated to a region of the resonator proximate to a point of maximum stress within the resonator. In a particular embodiment, the resonator includes a first material with a trench containing the second material.
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Citations
28 Claims
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1. A microelectromechanical system (MEMS) resonator device, comprising:
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at least one resonating member that includes a first material having one or more trenches defined therein, each of the trenches being at least partially filled with a second material that acts to modify the thermal coefficient of frequency (TCF) of the resonator device; where the resonating member has a top surface, a bottom surface, and one or more sidewalls; where each of the trenches extends through the first material from the top surface to the bottom surface of the resonator; where each of the trenches is isolated by the first material from the sidewalls of the resonator such that no second material filling each trench is present at the sidewalls of the resonator; and wherein the second material has a Young'"'"'s modulus temperature coefficient that is different from the Young'"'"'s modulus temperature coefficient of the first material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A microelectromechanical system (MEMS) resonator device, comprising:
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at least one resonating member that includes a first material having one or more trenches defined therein, each of the trenches being at least partially filled with a second material that acts to modify the thermal coefficient of frequency (TCF) of the resonator device; and wherein the second material has a Young'"'"'s modulus temperature coefficient that is different from the Young'"'"'s modulus temperature coefficient of the first material; wherein the one or more trenches are located in one or more regions of the resonating member that include a point of maximum stress within the resonating member during operation of the resonator device; and wherein the one or more regions are located on opposite sidewalls of the resonating member.
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23. A microelectromechanical system (MEMS) resonator device, comprising:
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at least one resonating member that includes a first material having one or more trenches defined therein, each of the trenches being at least partially filled with a second material that acts to modify the thermal coefficient of frequency (TCF) of the resonator device; wherein the second material has a Young'"'"'s modulus temperature coefficient that is different from the Young'"'"'s modulus temperature coefficient of the first material; and wherein each of the one or more trenches is defined to extend from a surface of the first material through only a portion of the first material to form a well having a bottom floor that comprises the first material.
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24. A microelectromechanical system (MEMS) resonator device, comprising:
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at least one resonating member that includes a first material having one or more trenches defined therein, each of the trenches being at least partially filled with a second material that acts to modify the thermal coefficient of frequency (TCF) of the resonator device; wherein the second material has a Young'"'"'s modulus temperature coefficient that is different from the Young'"'"'s modulus temperature coefficient of the first material; and wherein the resonating member comprises an elongated beam having a length; and
wherein each of the one or more trenches is defined in the first material as an elongated trench having a length oriented parallel to the length of the elongated beam.
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25. A microelectromechanical system (MEMS) resonator device, comprising:
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at least one resonating member that includes a first material having one or more trenches defined therein, each of the trenches being at least partially filled with a second material that acts to modify the thermal coefficient of frequency (TCF) of the resonator device; and wherein the second material has a Young'"'"'s modulus temperature coefficient that is different from the Young'"'"'s modulus temperature coefficient of the first material; wherein at least a portion of the at least one resonating member resonates via a flexural mode; wherein the resonating member comprises at least one cantilevered beam that is anchored at a first end; and
wherein the one or more trenches are located in one or more regions of the resonating member on opposite sidewalls of the resonating member and proximate to the anchored first end. - View Dependent Claims (26)
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27. A microelectromechanical system (MEMS) resonator device, comprising:
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at least one resonating member that includes a first material having one or more trenches defined therein, each of the trenches being at least partially filled with a second material that acts to modify the thermal coefficient of frequency (TCF) of the resonator device; wherein the second material has a Young'"'"'s modulus temperature coefficient that is different from the Young'"'"'s modulus temperature coefficient of the first material; and wherein each of the one or more trenches is only partially filled with the second material. - View Dependent Claims (28)
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Specification