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.

High-Frequency TaO x -Based Compact Oscillators

Abstract: In this paper, we demonstrate three key features of oxide-based nano-oscillators: 1) the observation of threshold switching and filamentary oscillations in TaO x ; 2) the highest frequency achieved by oxide-based oscillators; and 3) a study with linear (resistor) and nonlinear (transistor) ballasts to clearly understand the role of filament dynamics in scaling. These oscillators show frequency tunability over the range of 20 kHz–250 MHz, with 250 MHz being the highest reported frequency for this class of oscillators. Different types of ballasts show frequency tunability using two distinct methods: 1) by tuning the channel resistance of the transistor and 2) by increasing the rail voltage across the ballast–device pair. This sheds new light on the oscillator dynamics for dense oscillator arrays aimed at oscillatory neural networks and other applications.

Temperature compensation for a variable frequency oscillator without reducing pull range

Abstract: A variable frequency oscillator having multiple, independent frequency control inputs, each coupled to a respective tuning sub-circuit. The tuning sub-circuits are connected in parallel with each other and with a resonator module, which may be a quartz crystal, inductor, or other reactance component. Each tuning sub-circuit consists of two varactors with their respective cathodes coupled to each other and to their corresponding frequency control input. By having the tuning sub-circuits connected in parallel to the resonator, the overall frequency pull range of each frequency control input remains unaffected by the activation of any other frequency control input. Preferably, at least one frequency control input is a temperature compensation control input that can maintain the variable oscillator insensitive to temperature variations while the remaining frequency control inputs provide functional frequency control.

Greatly improved small inductance measurement using quartz crystal parasitic capacitance compensation.

Abstract: Generally, quartz crystal inductance frequency pulling in oscillators is very low and therefore is not often used in practice. The new method of improving frequencypullability uses inductance to compensate for quartz stray capacitances. To this end, a special AT fundamental quartz crystal working near the antiresonance frequency is selected. By modifying its equivalent circuit with load inductance and series tuning capacitance, the magnetic sensing of the circuit can be highly improved. The experimental results show that the new approach using the quartz crystal stray capacitance compensation method increases the frequency pulling range (from ≅ 2 kHz/mH to ≅ 600 kHz/mH) by × 300 depending on the type of oscillator, making possible the measurement of nano-magnetic changes.

Quartz crystal resonator, quartz crystal unit, and quartz crystal oscillator

Abstract: PROBLEM TO BE SOLVED: To provide a miniature tuning fork quartz crystal resonator capable of vibrating in a flexural mode and having high stability at a frequency for a fundamental mode of vibration, a small equivalent series resistance R 1 and a high quality factor Q, and to provide a quartz crystal unit comprising the quartz crystal resonator, and a quartz crystal oscillator for providing an output signal with a highly stable oscillation frequency. SOLUTION: The tuning fork bent quartz crystal resonator comprises tuning fork arms; and a tuning fork base, each tuning fork arm having a groove on its upper and lower faces, electrodes being deposited to the side of the grooves, and electrodes of different polarity deposited to side faces of each turning arm opposite to the electrodes deposited to the groove side face. The tuning base is connected to a frame via a connection part. Moreover, the quartz crystal oscillator is realized wherein the bent quartz crystal resonator configures the quartz crystal unit, the figure of merit in a fundamental mode of vibration is greater than the figure of merit in a second overtone mode of vibration, and the output signal from the quartz crystal oscillator has the oscillation frequency in the fundamental mode of vibration on the basis of a relation between an amplification factor of an amplifier circuit and a feedback factor of a feedback circuit. COPYRIGHT: (C)2005,JPO&NCIPI

Temperature compensation crystal oscillator

Abstract: A temperature compensated crystal oscillator comprises a crystal oscillating circuit having an AT-cut crystal resonator; a linearizing correction circuit for transforming a temperature characteristic curve of an oscillating frequency of the crystal resonator into a straight line using a fixed coefficient common to all crystal resonators; a gradient correction circuit for eliminating the gradient of the linearized temperature characteristic of the oscillating frequency usmg a variable coefficient depending on the type of crystal resonator; and an f0 adjustment circuit for adjusting the gradient corrected temperature characteristic of the oscillating frequency so as to cause the oscillating frequency to lie within an allowable range. Thus, upon the temperature compensation of the oscillating frequency, there are separately performed the linearizing correction, the gradient correction and the f0 adjustment, to achieve a fast temperature compensation adjustment of the oscillating frequency.