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.

A study on estimation of frequency aging for rectangular AT-cut resonators

Abstract: This paper suggests estimate method of frequency-aging characteristic for the purpose of improving stabilization of frequency-aging characteristic of crystal resonator. This is the method in which change of quantity is calculated using estimated formula for every factor of frequency change from data of frequency-aging characteristic and by analyzing the temperature dependence. As such, this method enables frequency-aging characteristics in resonators to be estimated and evaluated with greater speed and accuracy.

Accurate characterization of the temperature coefficient of permittivity of sapphire utilizing the dual-mode frequency locked technique

Abstract: In this work we present a new method to obtain accurate characterization of the temperature coefficient of permittivity (TCP) of an anisotropic crystal, which we name the dual-mode frequency locked (DMFL) technique. The technique requires precise simultaneous frequency measurements of two orthogonally polarized modes as a function of temperature. This was achieved by configuring a sapphire resonator as a pound locked dual-mode oscillator and measuring the frequencies with a frequency counter, while simultaneously recording the temperature with a platinum thermometer. From the two data files of frequency versus temperature, and the knowledge of electric and dimensional filling factors (obtained from finite element analysis), it was possible to calculate the integrals of the TCP without resorting to polynomial fits. This resulted in a precise model of the components of the TCP between 50 to 77 K for sapphire. The model is accurate enough to predict within a few degrees K, the frequency turnover temperatures of the difference frequency of a dual-mode oscillator.

A Note on a Bridged-T Network

Abstract: A bridged-T network previously employed for the measurement of resistance is analyzed, and is shown to be useful as the frequency-determining element of a resistance-tuned oscillator The resistance-capacitance form of the network permits a wide tuning range and simple switching between ranges, while the resistance-inductance network suggests the possibility of building an oscillator having decade frequency dials With both forms of the network a moderate value of equivalent Q can be obtained, which is desirable for accuracy and stability of frequency calibration

Ultra high frequency oscillator

Abstract: The present invention re'ates to ultra high frequency oscillation generators. It is well known that at very short wave-lengths it is extremely difficult to obtain high power oscillators of sufficient stability, that is, whose frequency variation is small compared to the frequency band width...