Patent ID: 9742373
Date: 2017-08-22
CPC Classifications: H01L,H03H,Y10T

Claim:
1. A method of making a temperature compensated resonator for use in a MEMS device, comprising the steps of: (a) providing a substrate including a device layer; (b) replacing material from the device layer with a replacement material along a predetermined region of high strain energy density for a resonating portion of the resonator, wherein one of the device layer material or the replacement material has a positive temperature coefficient of elasticity (TCE), and the other one of the device layer material or the replacement material has a negative TCE; (c) depositing a capping layer over the replacement material; and (d) etch-releasing the resonator from the substrate, wherein the resonating portion of the resonator is configured to oscillate at a desired frequency when excited by a transducer, and wherein the resonating portion of the resonator comprises both the device layer material and the replacement material, thereby imparting the resonator with a temperature coefficient of frequency (TCF) that is lower than the TCF of the resonator without the replacement material.