Patent ID: 11909376
Assignee: SITIME CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method of manufacturing an integrated circuit, the method comprising:
providing a microelectromechanical system (MEMS) resonator on the integrated circuit;
wherein providing comprises forming the MEMS resonator to have a degenerately doped single-crystal silicon (SCS) layer, a piezoelectric material layer disposed on the degenerately doped SCS layer, and an electrically conductive layer disposed on the piezoelectric material layer opposite the degenerately doped SCS layer, wherein the integrated circuit is to provide an output dependent on a resonance mode of the MEMS resonator; and
wherein forming the MEMS resonator comprises configuring the degenerately doped SCS layer to have a dopant concentration and crystal orientation relative to an axis of vibration of the resonance mode such that the degenerately doped SCS layer has a second order temperature coefficient of frequency (TCF) that is opposite in sign to the second order TCF of the piezoelectric material layer.