Patent ID: 8593155

Claim:
A MEMS sensor comprising: a substrate wafer; at least one resonant mass supported by the substrate wafer and configured to resonate substantially in-plane; at least one transducer coupled to the at least one resonant mass for at least one of driving and sensing in-plane movement of the at least one resonant mass, wherein at least part of one surface of the resonant mass is configured for exposure to an environment external to the MEMS sensor and wherein the at least one transducer is isolated from the external environment, wherein the at least one transducer is at least partially contained within an isolated cavity formed at least in part by the at least one resonant mass and the substrate wafer, wherein the at least one resonant mass is part of a resonator cap attached to the substrate wafer, and wherein the resonator cap and the substrate wafer form an isolated cavity within which the at least one transducer is at least partially contained; and a hermetic seal at an interface between the resonator cap and the substrate wafer.