Stress Compensated Quartz Resonator Having Ultra-Linear Frequency-Temperature Response.
DEPARTMENT OF THE ARMY WASHINGTON DC
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A new family of stress compensated quartz resonators having cuts exhibiting an ultra-linear frequency vs. temperature characteristic. This family of resonators has an orientation defined with respect to the crystallographic axes by polar angles phi and theta, which angles lies on the locus where the second-order temperature coefficient of frequency is zero between the angles phi 20 deg or - 2 deg and theta 20 deg or - 5 deg, and in close proximity to the locus of zero coefficient of stress. In one preferred embodiment, the resonator comprises a plate whose angles of cut phi and theta are both substantially equal to 20 deg. In a second preferred embodiment an exact stress compensation is provided where phi is substantially equal to 20.8 deg and theta is substantially equal to 23.2 deg, an orientation where the locus of the zero coefficient of stress intersects the locus of the zero of the second-order temperature coefficient. Author
- Electrical and Electronic Equipment