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.

New design of high-precision oven controlled crystal oscillator

Abstract: Combining oven controlled technique,digital compensation,high-resolution frequency difference measurement and self-calibration technique,a new design method of precise oven controlled crystal oscillator(OCXO) is proposed.Fine compensation is made in the vicinity of the crystal temperature inflection point by using the non-real-time temperature compensation strategy,and self-calibration system is integrated in the crystal.The method improves the digital compensated phase noise,simplifies the traditional OCXO development system,reduces the cost and shortens the developing cycle.Experiment results show that with a standard reference signal and self-calibration updated data,the oscillator can work stable and achieve its best performence.The performance index of crystal oscillator had an improvement with one to two orders of magnitude on the basis of original technical index.The method is widely used in the improvement of high-end crystal oscillator and atomic clock.

Frequency stable electric discharge oscillator

Abstract: This invention relates to frequency stable electric discharge oscillators and especially to piezoelectric crystal controlled electric discharge oscillators embodying means operative with respect to the electric discharge device and circuit, that is, to elements external to the crystal itself,...

Simulation of a parametric quartz crystal oscillator by the symbolic harmonic method

Abstract: The Symbolic Harmonic Analysis (SHA) method is a frequency domain approach for computing the steady state of ultra stable quartz crystal oscillators. First, we present a general method to convert a set of differential equations into a system of non-linear algebraic equations that can be solved for the periodic steady state solution. Then, we apply this method to simulate the behavior of a parametric quartz crystal oscillator currently being developed at FEMTO-ST/LCEP. This oscillator uses a 10 MHz quartz resonator and a 20 MHz signal derived from the oscillator nonlinearities is used to pump a varactor-diode. The quartz resonator time constant induces too long simulation time with classical integration methods. So that the symbolic harmonic analysis offers a good alternative to quickly obtain the periodic steady state. Simulation results are compared with experimental data.

A study on Frequency Stability of High Precision Oscillator using GPS

Abstract: A study on Frequency Stability of High Precision Oscillator using GPS Tomoki Shioda, Non-member (Nihon University), Kunihiko Manju, Member (Nihon University), Hideo Otsuka, Non-member)Kinseki Ltd.),Yoshifumi Sekine, Member (Nihon University) This paper studies on high precision oscillator using GPS. In recent years, the high stabilization of the oscillator has been requested along with high speed of mobile communication devices. In this paper, first, we study on the relation between the number of measurement times and precision of the GPS reception signal. Because SA(Selective Availability) was canceled from May 2000, the precision of the received GPS signals is improving at present. Therefore, there is a possibility that we can decrease the integration number of measurement times. We show that integration with approximately lo-' times must be done. As a result we show that equal or superior stability is obtained at 1/10 the previous integration number of time. Also, the GPS reception signal has the high stability for the aging characteristic, We study on improvement of aging characteristic of crystal oscillator by using estimate function. As a result, we show that the frequency change reducing method by the aging characteristic revision is effective.