Planar type thickness shear mode quartz oscillator
First Claim
1. An oscillator comprising a planar type thickness shear mode quartz resonator connected to a negative resistance oscillation circuit in which the proportion between the diameter and the thickness of the quartz resonator is so designed that the difference between the impedance of the quartz resonator and the negative resistance of the oscillation circuit is greater in the third overtone than in other oscillation modes.
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Accused Products
Abstract
A planar type thickness shear mode quartz resonator which can be operated by an oscillation circuit free of any coils or condensers in the tuning circuit and in which the ratio between the diameter and the thickness of the resonator is so designed as to yield stable oscillation in the third overtone. The difference between the negative resistance of the oscillation circuit and the crystal impedance of the quartz resonator is greater in the third overtone than the difference in other oscillation modes.
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Citations
10 Claims
- 1. An oscillator comprising a planar type thickness shear mode quartz resonator connected to a negative resistance oscillation circuit in which the proportion between the diameter and the thickness of the quartz resonator is so designed that the difference between the impedance of the quartz resonator and the negative resistance of the oscillation circuit is greater in the third overtone than in other oscillation modes.
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6. In a negative resistance oscillation circuit operable in a plurality of oscillation modes:
- a planar type thickness shear mode AT-cut quartz resonator having a diameter and a thickness, the ratio between the diameter and the thickness of said resonator being so designed as to obtain more stable oscillation in the third overtone mode than in other oscillation modes.
- View Dependent Claims (7, 8, 9, 10)
Specification