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.

Parametric oscillators and amplifiers. I

Abstract: For pt. I see ibid., vol.8, no.5, 310 (1973). An oscillating system is conventionally excited by a force at the resonant frequency. In the normal electronic feedback oscillator or signal generator this is derived, via the amplifier, from a DC source. Thus the net effect is that of frequency conversion of power from zero frequency to the oscillation frequency. For the parametric oscillators discussed the conversion is from a frequency 2 omega 0 (say) to a frequency omega 0.

Various ways to temperature-regulate an ultrastable quartz oscillator

Abstract: An ultrastable quartz crystal oscillator (USO) must obviously be ovenized. Frequency fluctuations partly come from static changes of the ambient temperature as well as dynamic ones. Both effects are detailed and their consequences on the oven design are discussed. The static frequency deviation is mainly related to the efficiency of the thermal regulator: for example, to achieve a relative frequency fluctuation a few 10/sup -10/ over an ambient temperature range of [-30/spl deg/C, +70/spl deg/C], the static thermal gain must reach at least 1000. However, a standard proportional and integral thermal controller which can eliminate the static error is unable to do this for the fast thermal disturbances. Here the thermal filtering must work in accordance with the cut-off frequency of the frequency-temperature transfer function of the quartz resonator. Various methods for controlling the oscillator temperature are presented: the usual method consists of using more than one temperature-controlled oven. This is often a volume-consuming process. An alternative approach, which is much simpler, is to add a "light" compensation effect to the feedback control system. A third way to improve the temperature regulation is based on distribution of the monitoring power. Obviously, a mix of those solutions is possible. Advantages and drawbacks of each of them are discussed. Practical results are shown and illustrated with 10 MHz USO devices.

The Design of AT-Cut Multiple-Electrode Quartz Crystal Resonator and the Research of its Oscillation Stability and Force-Frequency Property

Abstract: According to the oscillation characteristics of the quartz crystal resonator and the relationship between its force sensitive property and stress distribution on crystal plate, the single-base multiple-electrode quartz crystal resonator is designed. The oscillation stability of the resonator with this structure is tested by using crystal frequency stability tester. The force-frequency property of the resonators formed by electrodes on different positions of the new structure crystal plate is studied by adding radial force on it. The experimental results show that when the new structure quartz crystal resonator works driven by integrated chip, its oscillation frequency stability can reach 10-8, with the electrode thickness increasing, the oscillation stability of the resonators improves. The force-frequency property of the resonator on the different position of the same crystal plate is different, and the force-frequency coefficient has an obvious difference. The total force-frequency coefficient of the newly designed single-base three-electrode quartz crystal resonator can reach 338.8Hz/N by using mix frequency process.