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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TL;DR: The reported electronic characterization and experimental results obtained with conducting polymers prove its reliability for ac-electrogravimetry measurements and, in general, for fast QCM applications.
Abstract: The monitoring of frequency changes in fast quartz crystal microbalance (QCM) applications is a real challenge in today’s instrumentation. In these applications, such as ac electrogravimetry, small frequency shifts, in the order of tens of hertz, around the resonance of the sensor can occur up to a frequency modulation of 1kHz. These frequency changes have to be monitored very accurately both in magnitude and phase. Phase-locked loop techniques can be used for obtaining a high performance frequency/voltage converter which can provide reliable measurements. Sensitivity higher than 10mV∕Hz, for a frequency shift resolution of 0.1Hz, with very low distortion in tracking both the magnitude and phase of the frequency variations around the resonance frequency of the sensor are required specifications. Moreover, the resonance frequency can vary in a broad frequency range from 5to10MHz in typical QCM sensors, which introduces an additional difficulty. A new frequency-voltage conversion system based on a double tuning analog-digital phase-locked loop is proposed. The reported electronic characterization and experimental results obtained with conducting polymers prove its reliability for ac-electrogravimetry measurements and, in general, for fast QCM applications.
15 citations
Patent•
28 Jun 2012TL;DR: In this paper, the first temperature associated with a crystal configured to provide a reference signal having a frequency was measured, and the second temperature was associated with the component that was coupled to the crystal by an electrically and thermally conductive line.
Abstract: A method in a mobile communication device includes: measuring a first temperature associated with a crystal configured to provide a reference signal having a frequency; measuring a second temperature associated with a component that is coupled to the crystal by an electrically and thermally conductive line; and compensating, based upon the measuring of the first and second temperatures, for a change in the frequency of the reference signal of the crystal.
15 citations
TL;DR: Experimental results show that it is feasible to design a low-phase-noise crystal oscillator based on improving QL, and can draw a conclusion that QL is explicitly related to circuit pa rameters.
Abstract: The phase noise within the half-bandwidth of the loop is closely related to the loaded quality factor QL. The importance of loaded quality factor QL and the method of reducing phase noise on the basis of improving QL are analyzed in this paper. Formulation of QL is derived from analysis of the Pierce oscillator circuit, and calculated with commercial numerical analysis software. According to the results, we can draw a conclusion that QL is explicitly related to circuit pa rameters. Based on this conclusion, a design of the prototype 120-MHz crystal oscillator is presented and the experiments are carried out. The crystal resonator utilized is an SC-cut 5th-overtone crystal resonator with an unloaded quality fac tor Q0 of about 1.05 × 105. The circuit parameter values are adjusted to make QL reasonably higher, while maintaining an output amplitude of 2 to 3 dBm. The measurement results of near carrier frequency phase noise are -104 dBc/Hz at 10 Hz and -134 dBc/Hz at 100 Hz. Experimental results show that it is feasible to design a low-phase-noise crystal oscillator based on improving QL.
15 citations
31 May 1989
TL;DR: In this article, several factors are reviewed for specifying and measuring the frequency vs. temperature (f-T) characteristics of precision quartz crystal oscillators, including static vs. dynamic measurement, thermal time constant, activity dips, condensables, hysteresis, and trim effect.
Abstract: Several factors are reviewed for specifying and measuring the frequency vs. temperature (f-T) characteristics of precision quartz crystal oscillators. Topics include static vs. dynamic measurement, thermal time constant, activity dips, condensables, hysteresis, and trim effect. This work reviews some f-T considerations that are not discussed in detail in MIL-0-55310. >
15 citations
13 Apr 1999
TL;DR: The balanced bridge oscillator circuit presented in this article perfectly compensates for the negative influence of the cable by two almost equal bridge branches; the first one contains the sensor crystal connected via the sensor cable, the second one contains an identical cable terminated by a capacity equal to the resonator's static capacity.
Abstract: The balanced bridge oscillator circuit presented here perfectly compensates for the negative influence of the cable. The oscillator circuit is characterized by two almost equal bridge branches; the first one contains the sensor crystal connected via the sensor cable, the second one contains an identical cable terminated by a capacity equal to the resonator's static capacity C/sub 0/. The cable compensation performance of the balanced bridge oscillator has been justified by a respective circuit analysis and by measurements of its key specifications in comparison with those of a conventional oscillator.
15 citations