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Crystal oven

About: Crystal oven is a research topic. Over the lifetime, 955 publications have been published within this topic receiving 10380 citations. The topic is also known as: oven-controlled crystal oscillator & OCXO.


Papers
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Patent
15 Aug 2011
TL;DR: A monolithic integrated digitally controlled oscillator circuit is discussed, which has the long-term stability of a quartz oscillator, and the output clock edge uncertainty has a standard deviation of less than 0.5 ns.
Abstract: A digitally controlled oscillator is provided. The digitally controlled oscillator includes a pair of transistors cross-coupled to each other, a switched capacitor array coupled to the pair of transistors and a plurality of frequency tracking units coupled to the pair of transistors. The pair of transistors provides an output signal. The switched capacitor array tunes a frequency of the output signal. The frequency tracking units tune the frequency of the output signal to a target frequency. At least one of the frequency tracking units is capable of selectively providing a first capacitance and a second capacitance. A tuning resolution of the frequency tracking unit is determined by a difference between the first and second capacitances.

29 citations

Proceedings ArticleDOI
01 Jun 1994
TL;DR: In this article, the authors proposed a dual-mode oscillator with TD-cut (xyb1/23/spl deg/25'/34)/spl deg/) crystal plate.
Abstract: There is very attractive idea to use SC-cut resonators excited on B and C modes for frequency stabilization (in particular, for digital thermocompensation) but up to now these operating regimes are used very seldom. The cause consists in a difficulty to get stable excitation in wide temperature range. Due to development of original resonator excitation networks, of special geometry of piezoelement and due to original technology of its manufacture, we succeeded in developing of B and C modes in wide (-60...+85)/spl deg/C temperature range. 70% yield of suitable units is attainable when resonators are exited on 10 MHz frequency using 1st mechanical harmonic. The requirements to a circuit of a dual-mode oscillator (that is oscillator capable of simultaneous exiting on two asynchronous frequencies) are presented. A lot of experiments have been involved to design double-mode crystal meeting the requirements assigned above. To avoid the dips of activity of the B-mode being inherent property of overton SC-cut crystals due to nonlinear interaction of the thickness modes the fundamental mode TD-cut (yxb1/23/spl deg/25'/34/spl deg/) crystal plate has been used here. Exploration of the modes activity behavior over a wide temperature range has shown that the motional resistance remains within (8-12) Ohms for C-mode and (50-65) Ohms for B-mode. Practical realization of the dual-modes oscillator in the form of a hybrid LCI is described. The dual-mode crystal oscillator parameters are: output frequency 10 MHz; supply voltage 5V; consumption current 5-7 mA; output levels TTL. >

29 citations

Journal ArticleDOI
TL;DR: In this paper, the frequency shifts of a tuning fork-shaped quartz oscillator with gas pressure were studied experimentally and theoretically and the experimental measurements showed that the frequency shift of the oscillator was very small in the pressure region below 1 Torr and much larger in the higher pressure region above 1 torr.
Abstract: The frequency shifts of a tuning‐fork‐shaped quartz oscillator with gas pressure were studied experimentally and theoretically. The experimental measurements showed that the frequency shift of the oscillator was very small in the pressure region below 1 Torr and much larger in the higher pressure region above 1 Torr. The experimental results were theoretically analyzed on the basis of a string‐of‐beads model for a quartz oscillator. The theoretical analysis showed that the resonance frequency shift of the quartz oscillator was small in the molecular flow region. In the viscous flow region the frequency shift was found to be proportional to the pressure. These theoretical results are in good agreement with the experimental data. The frequency shift of the oscillator in the higher pressure region was also found to be proportional to the molecular weight of the gas species in both theory and experiment.

29 citations

Patent
15 Jun 1979
TL;DR: In this article, the authors proposed to obtain high Q value such as 200,000-300,000 by eliminating loss of oscillation energy, by providing the support resonated with the frequency equal to the resonant frequency of the coupled diapason type crystal oscillator.
Abstract: PURPOSE:To enable to obtain high Q value such as 200,000-300,000 by eliminating loss of oscillation energy, by providing the support resonated with the frequency equal to the resonant frequency of the coupled diapason type crystal oscillator at the base of the coupled tuning fork type crystal oscillator. CONSTITUTION:The coupled tuning fork type crystal oscillator consists of the main body 6, support 7 for the main body 6, bonding part 8 for the lead, boundary 9 between the support 7 and the bonding part 8, and the boundary 10 between the main body 6 and the support 7. Further, the main body 6, support 7 and bonding part 8 are cut out incorporatedly from the crystal ore, and the resonant frequency of the support 7 is equally selected as the resonant frequency of the main body 6. With this constitution, the oscillating displacement of the boundary 9 is zero, and the oscillating displacement of the bonding part 8 is almost zero. Accordingly, even if the bonding part 8 is soldered with leads, no oscillation energy is lost and high Q value such as 200,000-300,000 is obtained, allowing the usage for electronic watches.

28 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20233
20228
20191
201711
201625
201524