Patent ID: 7662655
Filing Date: 2010-02-16
Classification: B81B,B81C,H03H

Abstract:
1. A method for forming a hermetically sealed vibrating micromechanical structure, the method comprising: in a base wafer formed of one of an insulating wafer and a Silicon-On-Insulator wafer, forming one or more resonator anchors adjacent to a capacitive air gap; in a resonator wafer formed of a Silicon-On-Insulator wafer having a single crystal silicon semiconductor material active layer and a semiconductor material handle layer separated by a dielectric layer, coupling the active layer directly to the resonator anchors of the base wafer; removing the handle and dielectric layers of the Silicon-On-Insulator resonator wafer; in the single crystal silicon semiconductor material active layer of the Silicon-On-Insulator resonator wafer, silicon dry etch micromachining a single crystal silicon resonator; forming one or more contact pads on an outer surface of the resonator wafer active layer; in a cover wafer formed of a single crystal silicon (SCS) semiconductor material, forming a cover having a plurality of access holes through the wafer between the spaced apart top and bottom surfaces and each access hole being aligned with a corresponding one of the contact pads on the outer surface of the resonator wafer active layer, and wherein forming the cover further comprises: