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.

Analysis and design of low-power - low-noise crystal oscillators accounting for electro-mechanical energy conversion aspects

Abstract: This paper presents an original multi-physics modeling methodology for the design and analysis of integrated crystal oscillators based on power-waves formulation. Conventional Barkhausen oscillation conditions criterion is derived in terms of reflection coefficients. Coupling module is introduced between the crystal resonator and the oscillator active-core in order to account for electromechanical energy conversion aspects. The proposed methodology is successfully applied to the design of low power and low noise integrated crystal oscillator in NXP-Semiconductors advanced BiCMOS technology. A phase noise better than −152dBc/Hz at 10KHz carrier offset with noise supply rejection better than −65dB are demonstrated.

An oscillator unit for a base station in a digital cellular radio network

Abstract: The invention relates to an oscillator unit for a base station or the like in a digital cellular radio network. The oscillator unit comprises an adjustable oven stabilized crystal oscillator (21). The oscillator unit additionally comprises a non-volatile memory means (27), in which is stored a control information defining the frequency of the oven stabilized crystal oscillator (21) at the start of the oscillator unit, a means (30, 31, 32) for deriving a reference frequency from a fixed digital transmission connection, such as a PCM connection, between the base station and the remaining cellular radio network, a frequency control loop (21, 22, 23, 24) for maintaining a long-term stability for the oven stabilized crystal oscillator (21) on the basis of a long-term average of the difference between the frequency of the oven stabilized crystal oscillator and said reference frequency.

Crystal oscillator for satellite

Abstract: Structure and apparatus located on a satellite which control the environment of a crystal oscillator for the purpose of attaining extreme frequency stability and reducing the problems of preflight testing and adjusting. The oscillator is located in an evacuated chamber together with heat shields and ovens.

Quartz crystal compensation circuit

Abstract: A compensation circuit is provided for a piezo-electric quartz crystal in a filter circuit for reducing the influence of the secondary resonance frequencies of the crystal on the filter characteristic. The Q-value of the crystal at one or several secondary resonance frequencies is reduced by connecting to the crystal a two-terminal network the impedance of which has a real and an imaginary part so that the real part gives an ohmic contribution which at the resonance frequency of the imaginary part reduces the Q-value of the crystal.