Topic
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.
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27 May 1987
TL;DR: In this article, a power series representation of the control voltage for a voltage controlled crystal oscillator is proposed to compensate for AT cut crystal oscillators, which offers the advantages of higher stability, lower power consumption and smaller size when compared with more conventional methods of compensation.
Abstract: Summary A novel method for the compensation of crystal oscillators has been developed. It is primarily intended for AT cut crystal oscillators and offers the advantages of higher stability, lower power consumption and smaller size when compared with more conventional methods of compensation. Compensation is achieved by generating a power series representation of the control voltage for a voltage controlled crystal oscillator. A more detailed description of the method was given at this symposium in 1983 (ref. ii). Initially an integrated circuit was developed which generated four voltages each varying as a function of temperature. One voltage is a constant whilst the others have a linear, quadratic and cubic variation with temperature. These voltages are combined in a summing amplifier to provide the compensation voltage required.
2 citations
13 Apr 1999
TL;DR: In this article, the authors compared the results with a double-oven controlled crystal oven using a simple integral thermal regulation, and the obtained results showed considerable improvement of frequency stability with temperature and the warm up time is much reduced.
Abstract: The presentation will discuss the differences and advantages of a thermal regulating system using the integral proportional method. The design study compares the results with a double oven controlled crystal oven using a simple integral thermal regulation. The obtained results using the described method show considerable improvement of frequency stability with temperature and the warm up time is much reduced : -20/spl deg/C+70/spl deg/C<1.10/sup -10/ 10 min <5.10/sup -10/ The holder size is also reduced to 50/spl times/50/spl times/38 mm. The simple proportional regulation method very much depends on the external conditions and the various thermal losses of the mass to be thermally regulated. Effectively this method is used to compensate for thermal losses of the system. The proportional integrated method overcomes the problem and is therefore more suitable for high stability oscillators. The principal problem to resolve is to understand and control the oven thermal constants as a function of the time constants of the integration.
2 citations
13 Apr 1999
TL;DR: Based on the principles of designing a low phase noise crystal oscillator, the authors in this article presented a single-crystal oscillator circuit with two or three crystals, which is suitable for mass production instead of just being developed in a laboratory.
Abstract: Based on the principles of designing a low phase noise crystal oscillator, the authors present a crystal oscillator circuit with two or three crystals. The electronic and mechanical construction of a crystal oscillator, EMC design, and how to choose suitable components are also mentioned. Based on this kind of circuit, a type of 100 MHz crystal oscillator with low phase noise (#(100 kHz)=-178 dBc/Hz) was developed by the authors. It can work in a very wide temperature range, which is from -55/spl deg/C -75/spl deg/C. It is suitable for mass production instead of just being developed in a laboratory.
2 citations
01 Jan 1948
TL;DR: In this article, the amount of distortion in the frequency-modulated output of a microwave oscillator when the oscillator is frequency stabilized is determined, and two stabilizing circuits are investigated: the if carrier type developed by R. V. Pound and a modification of this discriminator, called the equal-arm discriminator, developed by F. P. Zaffarano.
Abstract: The amount of distortion is determined in the frequency-modulated output of a microwave oscillator when the oscillator is frequency stabilized. Two stabilizing circuits are investigated. They are the if carrier type developed by R. V. Pound and a modification of this dis-criminator, called the equal-arm discriminator, developed by F. P. Zaffarano. The distortion is calculated for both types of stabilizers and the calculations are checked by measurements. Measured values for the distortion are somewhat higher than the predicted values, but there is a reasonable correlation between the two.
2 citations
01 Jan 2009
TL;DR: In this paper, a dual-mode crystal oscillator (DMXO) based on two bridge-type oscillators using a quartz resonator as frequency stabilization element and sensor element of its own temperature as well was investigated.
Abstract: This paper deals with dual-mode crystal oscillator (DMXO) based on two bridge- type oscillators using a quartz resonator as frequency stabilization element and sensor element of its own temperature as well. We have investigated a possibility of miniature multilayer ceramic inductors employment in the DMXO. Employment of such miniature inductors instead of air-core wire-wound ones enables further reduction of the oscillator dimensions, as well as a reduction of temperature gradients among the DMXO elements.
2 citations