Patent
Method for achieving highly reproducible acceleration insensitive quartz crystal oscillators
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TLDR
In this paper, an oscillator and a method for producing an improved oscillator that will generate an accurate frequency when encountering a vibration was presented. But the oscillator was not used to measure any vibration and the method used a crystal with minimal cross-axis coupling.Abstract:
An oscillator and a method for producing an improved oscillator that will generate an accurate frequency when encountering a vibration. The oscillator and method uses a crystal with minimal cross-axis coupling. Further, a first accelerometer produced using MEMS technology is used. The first accelerometer is positioned inside of the oscillator so that the accelerometer accurately measures any vibration encountered by the oscillator. The first accelerometer and the crystal are maintained at constant temperature to minimize phase shifts and gain variations.read more
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References
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Patent
Crystal oscillator compensation circuit
TL;DR: In this article, a signal de compensation de temperature (UK) is defined, which is defined as the ratio of the temperature produced by an oscillateur to the frequency of a diode a capacite variable.
Journal ArticleDOI
Suppression of vibration effects on piezoelectric crystal resonators
TL;DR: An active method and apparatus for suppressing or cancelling the effects of vibration on quartz crystal controlled oscillators by generating an electrical signal which is a replica of the vibration acting on the crystal resonator, which signal is thereafter properly phased and applied directly to the crystal electrodes which thereby operates to substantially eliminate unwanted vibration induced sidebands in the signal output of the oscillator as discussed by the authors.
Patent
Apparatus and method for improved crystal time reference
TL;DR: In this paper, a timing reference system is provided for correcting inaccuracies in an output of a crystal oscillator experienced by the crystal oscillators during use in a mobile platform, which utilizes a three-axis accelerometer mounted adjacent to an oscillator on a substrate.
Patent
Suppression of vibration effects on piezoelectric crystal resonators
TL;DR: An active method and apparatus for suppressing or cancelling the effects of vibration on quartz crystal controlled oscillators by generating an electrical signal which is a replica of the vibration acting on the crystal resonator, which signal is thereafter properly phased and applied directly to the crystal electrodes which thereby operates to substantially eliminate unwanted vibration induced sidebands in the signal output of the oscillator as mentioned in this paper.
Proceedings ArticleDOI
Suppression of Vibration-Induced Phase Noise in Crystal Oscillators: an Update
TL;DR: Several methods have been proposed for reducing vibration (acceleration) effects without recourse to bulky and massive vibration isolators, such as improved resonators: resonator pairs1t2r3; varactor tuning4; capacitive-accelerometer tuning5: and polarization effect tuning6 as mentioned in this paper.