Lever mechanisms for anti-phase mode isolation in MEMS tuning-fork structures
First Claim
1. A MEMS resonator comprising:
- two resonating masses having an anti-phase and in-phase resonance mode, each mode having a resonance frequency; and
an anti-phase resonance levering system coupled to the two resonating masses to stiffen and/or dampen the in-phase resonance mode while leaving the anti-phase resonance mode compliant by effectively raising the in-phase resonance frequency above the anti-phase resonance frequency, and potentially creating a large frequency separation between the two resonance modes, so that energy transfer is reduced between the two modes, allowing for robustness to external acceleration, because the in-phase mode is of a higher frequency,wherein the anti-phase resonance levering system comprises a plurality of levers and a plurality of clamped-clamped beams, the plurality of levers coupled to the two resonating masses and to the plurality of clamped-clamped beams via a plurality of springs.
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Abstract
A MEMS resonator includes two resonating masses having an anti-phase and in-phase resonance mode, each mode having a resonance frequency, and an anti-phase resonance levering system coupled to the two resonating masses to stiffen and/or dampen the in-phase resonance mode while leaving the anti-phase resonance mode compliant. This effectively raises the in-phase resonance frequency above the anti-phase resonance frequency, and potentially creates a large frequency separation between the two resonance modes. This reduces the energy transfer between the two modes, allowing for robustness to external acceleration, because the in-phase mode is of a higher frequency. The anti-phase resonance levering system is disposed between the two resonating masses as an internal levering mechanism, or is disposed around the two resonating masses as an external levering mechanism.
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Citations
21 Claims
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1. A MEMS resonator comprising:
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two resonating masses having an anti-phase and in-phase resonance mode, each mode having a resonance frequency; and an anti-phase resonance levering system coupled to the two resonating masses to stiffen and/or dampen the in-phase resonance mode while leaving the anti-phase resonance mode compliant by effectively raising the in-phase resonance frequency above the anti-phase resonance frequency, and potentially creating a large frequency separation between the two resonance modes, so that energy transfer is reduced between the two modes, allowing for robustness to external acceleration, because the in-phase mode is of a higher frequency, wherein the anti-phase resonance levering system comprises a plurality of levers and a plurality of clamped-clamped beams, the plurality of levers coupled to the two resonating masses and to the plurality of clamped-clamped beams via a plurality of springs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A MEMS resonator comprising:
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two resonating masses having an anti-phase and in-phase resonance mode, each mode having a resonance frequency; and an anti-phase resonance levering system coupled to the two resonating masses, where the in-phase resonance frequency is higher than the anti-phase resonance frequency, while the anti-phase resonance mode is left compliant, wherein the anti-phase resonance levering system comprises a plurality of levers and a plurality of clamped-clamped beams, the plurality of levers coupled to the two resonating masses and to the plurality of clamped-clamped beams via a plurality of springs. - View Dependent Claims (19, 20, 21)
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Specification