Patent ID: 8669822

Claim:
A method of manufacturing a MEMS resonator formed from a first material having a first Young's modulus and a first temperature coefficient of the first Young's modulus, and a second material having a second Young's modulus and a second temperature coefficient of the second Young's modulus, a sign of the second temperature coefficient being opposite to a sign of the first temperature coefficient at least within operating conditions of the resonator, the method comprising the steps of: forming the resonator from the first material, the resonator having a resonant frequency and including: a spring having first and second ends and an elongated portion of the first material therebetween, the first end connected to an anchor of the MEMS resonator, and a rigid mass region attached to the second end of the spring; creating a 3-dimensional space within the first material of the rigid mass region, within which the second material may be applied; and applying the second material to the resonator, a quantity of the second material being controlled by a geometry of the 3-dimensional space in the resonator, including desensitizing the resonant frequency to spring dimensions and oxide thickness.