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.

Frequency-modulated quartz oscillators for broadcasting equipment

Abstract: An f.m. system is described which employs a directly-frequency-modulated quartz-crystal oscillator, the design of the circuit and of the crystal plate being treated in some detail. Easy methods of setting-up derive from the use of an oscillator having a high Q-factor. The system has the advantages of simplicity, reliability and ease of maintenance.

Temperature Compensation of Aluminum Nitride Lamb Wave Resonators Utilizing the Lowest-Order Symmetric Mode

Abstract: : Frequency references with a low phase noise and a low temperature-induced frequency drift are important components for navigation systems, wireless communication systems, and signal processing applications. As is well known, crystal oscillators (XOs) and temperature compensated crystal oscillators (TCXOs) based on AT-cut quartz dominate this market because AT-cut quartz has outstanding frequency-temperature performance and long-term stability. However, there are drawbacks and fabrication limitations for quartz-based resonators related to down-scaling for future applications. In addition, the material properties of quartz limit the integration of the frequency references and the complementary metal-oxide semiconductor (CMOS) circuits on a single chip. As a result, there has been a great interest in the realization of low-cost, CMOS-compatible, high quality factor (Q), and temperature-stable micro-electro-mechanical systems (MEMS) resonators.

The Frequency Spectrum of a Pulled Oscillator

Abstract: The spectrum of an oscillator is examined experimentally and theoretically under conditions where the oscillator frequency is disturbed by a stable signal injected into the oscillator circuit.

System and method for reducing temperature-dependent and process-dependent frequency variation of a crystal oscillator circuit

Abstract: In embodiments of the present disclosure, a method may include determining an ambient temperature of an oscillator. The method may also include estimating an approximate frequency of operation of the oscillator. The method may additional include determining a process-based compensation to be applied to a resonator of the oscillator based on the approximate frequency. The method may further include setting a capacitance of a variable capacitor coupled to the resonator in order to compensate for temperature-dependent and process-dependent frequency variation of the oscillator based on the ambient temperature and the process-based compensation.

A Convenient Method for Referring Secondary Frequency Standards to a Standard Time Interval

Abstract: A method is described for obtaining a convenient low frequency from a high-frequency standard by means of harmonic control of distorted wave oscillators (multi-vibrators). In the equipment described two such oscillators are employed, for convenience in arriving at a harmonic series of frequencies, based on 10-kc fundamental, as well as a frequency of 1 kc for operation of the clock motor, from a standard frequency of 50 kc. The conclusions based upon an experimental investigation of harmonic control of the distorted wave oscillators are given. Representative curves of the variations in frequency of the 50-kc standard for 10-day intervals are shown.