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.

Method for achieving highly reproducible acceleration insensitive quartz crystal oscillators

Abstract: An oscillator and a method for producing an improved oscillator that will generate an accurate frequency when encountering a vibration. The oscillator and method uses a crystal with minimal cross-axis coupling. Further, a first accelerometer produced using MEMS technology is used. The first accelerometer is positioned inside of the oscillator so that the accelerometer accurately measures any vibration encountered by the oscillator. The first accelerometer and the crystal are maintained at constant temperature to minimize phase shifts and gain variations.

GPS disciplined offset-frequency quartz oscillator

Abstract: The global positioning system can be used to provide a precise time and frequency reference to control local oscillators. The local oscillator is necessary to provide holdover of time and frequency in the absence of GPS and to average short-term jitter in the GPS signal recovered by the receiver. This paper gives an overview of the hardware design and control strategy for converting the output of a free-running ovened quartz oscillator (OCXO) to the desired standard frequency output by reference to GPS. The method enables the use of a very low aging fifth overtone quartz oscillator, to which final plating of the crystal to trim 'on frequency' is omitted. Sufficient frequency control could not normally be applied to this very stable oscillator by the conventional method of varactor tuning. A compact implementation is achieved with very low spurious frequency content and low phase-noise of the standard frequency output. Performance data is presented.

A dual mode oscillator based on narrow-band crystal oscillators with resonator filters

Abstract: A dual mode crystal oscillator using two narrow-band transistor Colpitts circuits has been developed. This oscillator excites arbitrary two-modes in a common resonator even if the modes are close to each other. The practical circuit structure and analysis of the proposed oscillator, and the experimental results are described.

Design and implementation of a CMOS VCXO for FM stereo decoders

Abstract: A circuit technique to simulate large variable capacitance of both positive and negative polarities over a given frequency range is discussed The simulated capacitance can be varied by voltage control from -60 to +100 pF The capacitor-simulating circuit is connected in parallel with a resonator to tune its parallel resonance An oscillator with grounded resonator is also developed Together with the variable capacitor, a voltage-controlled crystal oscillator (VCXO) is realized The oscillation frequency of the oscillator can be tuned continuously from 452 to 461 kHz by voltage control Detailed analyses to completely characterize the oscillator with a simple expression are presented The prototype of the VCXO has been fabricated in a 4- mu m standard CMOS process >

Techniques of radiation phase matching within optical crystals

Abstract: A non-linear crystal is used as an optical radiation frequency converter. Its efficiency is optimized though control of one or more operating conditions that include the temperature of the crystal, its angular relationship with incident radiation and an electric field bias in which the crystal operates. The relative phase between radiation incident upon the crystal and that generated by it is adjusted by a servo loop which controls one or more of these operating conditions. The servo loop responds to a cyclic variation in the output radiation which occurs when the crystal is not operating at an optimal efficiency. A quasi-phase matched (QPM) crystal is preferred. Several specific crystal structures are described. The technique has an application in a frequency doubler, among others.