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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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Journal ArticleDOI
TL;DR: In this paper, finite element analysis was used to simulate heating of an oven-controlled crystal oscillator (OCXO) element, and the results were compared by simulation of the behavior of the quartz oscillator in a nitrogen and helium environment and also under vacuum.
Abstract: An oven-controlled crystal oscillator (OCXO) uses thermostatic regulation to stabilize the output frequency by maintaining the temperature of the quartz crystal oscillator at a fixed level. The OCXO is heated by a chip which holds the temperature of the device at a working level of between 80 and 105 °C to stabilize the output frequency. In this study, finite element analysis was used to simulate heating of the OCXO element. The heating temperature vs. time change, when heat is transferred to the quartz crystal, and the quartz crystal thermostatic time variation vs. the quartz temperature distribution, were both investigated. The results were compared by simulation of the behavior of the quartz oscillator in a nitrogen and helium environment and also under vacuum.

3 citations

Proceedings ArticleDOI
28 May 1997
TL;DR: In this paper, the influence of the thermal noise on the passive hydrogen maser frequency instability is analyzed. But unlike the other passive frequency standards not frequency, but phase fluctuations of the quartz oscillator near the even harmonics of the modulation frequency are not considered.
Abstract: The influence of the thermal noise on the passive hydrogen maser frequency instability is analysed. New dependencies of the frequency instability on the excitation signal parameters are obtained in comparison with the results which were presented in the known publications. The excitation signal phase modulation index and the atom line saturation factor are specified which provide the minimum of the maser frequency instability. The influence of the modulation frequency on the passive hydrogen maser frequency instability is analysed. The influence of fast phase fluctuations of the quartz oscillator on the hydrogen maser frequency instability is discussed. It is shown that unlike the other passive frequency standards not frequency, but phase fluctuations of the quartz oscillator near the even harmonics of the modulation frequency affect the maser frequency instability. This influence is two orders less than for other passive standards. Frequency shifts due to a spurious amplitude modulation of the excitation signal at the frequency modulation /spl Omega/, a spurious phase modulation at the frequency 2 /spl Omega/, an inaccuracy of the receiver tuning to the signal frequency are calculated.

3 citations

Patent
03 May 1999
TL;DR: In this paper, a programmable crystal oscillator is provided having a memory for storing frequency-defining parameters, which can be used to program an adjustable capacitive load circuit coupled to a crystal to adjust the crystal source frequency.
Abstract: A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.

3 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe a simple portable apparatus with which frequencies in the range 100 Mc/s to 10000 MC/s can be measured in terms of that of a standard quartz oscillator.
Abstract: The description is given of a simple portable apparatus with which frequencies in the range 100 Mc/s to 10000 Mc/s can be measured in terms of that of a standard quartz oscillator. Two oscillating detector stages are used. A heterodyne beat is obtained between the signal of frequency f and the nth harmonic of oscillator 1. A second beat is obtained between oscillator 1 and the mth harmonic of oscillator 2. Oscillator 2 is thus set at a frequency of f/mn. The frequency scale of oscillator 2 is then calibrated by the harmonics of oscillators controlled in frequency by a quartz oscillator, and the frequency corresponding to the setting f/mn is found by interpolation between the calibration points. The accuracy of the measurement in terms of the frequency of the quartz oscillator is ± 1 part in 106; but for an overall accuracy of this order it is usually necessary to check the frequency of the quartz oscillator. The size of the instrument, excluding power supply equipment, is 27 in × 9 in × 12 in, and its weight is approximately 30 lb. The apparatus is designed to operate from batteries or a stabilized mains supply providing 300 volts h.t. and 6 volts for the heaters.

3 citations

Proceedings ArticleDOI
24 Jun 2013
TL;DR: In this paper, the blank realization and the topology of the resonator prototype are exposed and a comparison of these resonators is given in terms of motional parameters and Q factors, and the results are presented according to the position of resonators inside the mother crystal block.
Abstract: In this paper, quartz crystal resonators have been cut from a quartz crystal block usually used to grow new generations of quartz crystal blocks. The blank realization and the topology of the resonator prototype are exposed. The resulting resonators are SC-cut with a 5 MHz resonant frequency. Then, we report the first noise measurements made on these quartz crystal resonators. A comparison of these resonators is given in terms of motional parameters and Q factors, and the results are presented according to the position of the resonators inside the mother crystal block.

3 citations

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