Patent ID: 8071398

Claim:
A method for fabricating a monolithic integrated circuit and MEMS resonator device, the method comprising: providing a first semiconductor substrate having a first surface region; forming one or more CMOS integrated circuit device provided on a CMOS integrated circuit device region overlying the first surface region, the CMOS integrated circuit device region having a CMOS surface region; forming a dielectric layer overlying the CMOS surface region; joining a second semiconductor substrate having a second surface region to the CMOS surface region by bonding the second surface region to the dielectric layer; thinning the second semiconductor substrate to a desired thickness while maintaining attachment to the dielectric layer; forming one or more via structures within one or more portions of the desired thickness of the second semiconductor substrate; forming a conformal coating of metal material within the one or more via structures; forming one or more free standing MEMS structures within one or more portions of the desired thickness of the second semiconductor substrate, the one or more MEMS structures being configured to be supported by one or more members integrally formed on the desired thickness of the second semiconductor substrate to cause the one or more MEMS structures to move in an oscillating manner characterized by a frequency range; and forming a sacrificial layer overlying the one or more free standing MEMS structures.