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

Claim 0:
1. An integrated circuit comprising:
a microelectromechanical system (MEMS) resonator on the integrated circuit;
the MEMS resonator having 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 the piezoelectric material layer has a second order temperature coefficient of frequency (TCF) and the degenerately doped SCS layer is configured 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 TCF that is opposite in sign to the second order TCF of the piezoelectric material layer.