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.

Crystal oscillator assembly

Abstract: An assembly for a quartz crystal oscillator housed within a can is set forth in which the oven assembly for the crystal is partially formed with metallized circuit boards to which the components for the electrical circuits for controlling the crystal oscillator are connected. A control transistor is directly mounted to one wall of the oven to further provide the major source of heat for the oven while reducing consumption of power.

Microwave Local Oscillator for a Cesium Frequency Standard Synthesized from a Cryogenic Sapphire Oscillator

Abstract: A synthesized microwave local oscillator for a cesium atomic frequency standard has been implemented using an ultra-stable oscillator. The oscillator was based on a high Q-factor cryogenic-sapphire-resonator cooled with liquid helium which operates on a Whispering Gallery mode. The cesium hyperfine transition frequency of 9.192 GHz was synthesized from the 10.812 GHz oscillation frequency, chosen because the corresponding mode had the best frequency stability. When compared with a hydrogen maser reference the local oscillator exhibited a fractional frequency stability of 6×10-15 for integration times of 600 to 1200 s at 9.192 GHz, limited only by the cryogenic sapphire oscillator.

NTS-1 (TIMATION-III) Quartz and Rubidium Oscillator Frequency Stability Results

Abstract: : The report describes frequency stability results obtained from the NTS-1 satellite. NTS-1 has three on-board frequency sources: one quartz oscillator and two rubidium resonators. These are used to derive the precise time and frequency signals radiated by the spacecraft. The data taken from each of three 2.5-hr daily passes are time difference (range) or frequency difference (doppler). These data are incorporated into a single value for each pass which is subsequently used in computing long-time Allan-variance results. The results presented here employ single-frequency measurements at 335 MHz. Analysis of these results indicate an effect on measured frequency stability that correlates with a resonant term in the orbit. The results further indicate the rubidium frequency depends on the spacecraft temperature, which confirms previous NRL preflight analysis.

Temperature-compensated crystal oscillator using square-law converter circuits for lower and higher temperature sides

Abstract: The invention provides a temperature-compensated crystal oscillator employing an AT-cut crystal resonator in a crystal oscillation circuit, having a substantially constant oscillation frequency at approximately room temperature, wherein an output of a temperature sensor, having a substantially rectilinear temperature characteristic, is converted into square-law cure signals by a square-law converter circuit on the lower temperature side and a square-law converter circuit on the higher temperature side, respectively, which are then combined together by a signal synthesis circuit, producing a rectilinear correction signal. Frequency adjustment circuits are controlled by the signal, and temperature compensation is achieved by executing rectilinear correction of the oscillation frequency of the crystal oscillation circuit. In the case where the oscillation frequency of the AT-cut crystal resonator has a temperature characteristic having any gradient, a gradient is added to the rectilinear correction signal.

High-performance DSP-TCXO using twin-crystal oscillator

Abstract: This paper describes a summary of the high stability DSP-TCXO (Digital Signal Processing-Temperature Compensated Crystal Oscillator) based on a high-accuracy temperature detection technology using two AT-cut crystal oscillators and a high-precision frequency compensation circuit.