Patent ID: 7868522
Filing Date: 2011-01-11
Classification: H03H

Abstract:
1. A temperature compensated pair of resonators, comprising: a first resonator comprising: a first bottom electrode; a first piezoelectric structure comprising a first piezoelectric layer, a second piezoelectric layer and an interstitial layer disposed between, and in contact with both the first piezoelectric layer and the second piezoelectric layer, wherein the interstitial layer comprises a stiffness coefficient versus temperature that is greater than a stiffness coefficient versus temperature of either of the first piezoelectric layer or the second piezoelectric layer; a mass load layer disposed beneath the first bottom electrode; and a first top electrode, wherein the first resonator has a first resonant frequency; and a second resonator comprising a second bottom electrode; a second piezoelectric structure; and a second top electrode, wherein the second resonator has a second resonant frequency and a temperature coefficient of the stiffness of the mass load layer differs from a temperature coefficient of stiffness of the second top electrode.