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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.


Papers
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Proceedings ArticleDOI
23 Aug 2004
TL;DR: In this article, the authors developed a 622 MHz fundamental crystal resonator using composite wafers with an air-gapped electrode to reduce the mass loading effect of the electrode.
Abstract: We have developed a 622 MHz fundamental crystal resonator using composite wafers with an air-gapped electrode. To reduce the mass loading effect of the electrode, we introduced a three layer laminated quartz wafer and an air-gapped electrode. The electrical characteristics of the 622 MHz fundamental crystal resonator have satisfied the target specification by using a new process and structure.

13 citations

Patent
05 Jan 2001
TL;DR: In this paper, a programmable crystal oscillator is provided having a memory for storing frequency-defining parameters, which can be used to program an adjustable capacitive load circuit coupled to a crystal to adjust the crystal source frequency.
Abstract: A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.

13 citations

Patent
Ralph T. Enderby1
13 Jan 1969
TL;DR: In this paper, a frequency modulated, solid state oscillator which oscillates at any one of a plurality of center frequencies in response to the positioning of a selector switch that connects a selected center frequency determining circuit to the oscillator is described.
Abstract: Frequency modulated, solid state oscillator which oscillates at any one of a plurality of center frequencies in response to the positioning of a selector switch that connects a selected center frequency determining circuit to the oscillator. Each of the center frequency determining circuits includes a crystal operating in its series resonant mode, an inductor for tuning, and a resistor for suppressing undesirable crystal operation. Frequency modulation is accomplished by impressing a modulating voltage across a varactor included in the frequency control circuit of the oscillator to thereby change its capacitance and consequently change the frequency of oscillation.

13 citations

Patent
01 Oct 2012
TL;DR: In this paper, a control circuit determines based on the measured amplitude to disable a low resistance path in the controlled switch array to reduce the applied gain below the power dissipation specification of the crystal.
Abstract: A large gain is used to start up the oscillation of the crystal quickly. Once the oscillation starts, the amplitude is detected. A control circuit determines based on the measured amplitude to disable a low resistance path in the controlled switch array to reduce the applied gain below the power dissipation specification of the crystal. Another technique introduces a mixed-signal controlled power supply multi-path resistive array which tailors the maximum current to the crystal. A successive approximation register converts the amplitude into several partitions and enables/disables one of several power routing paths to the inverter of the oscillator. This allows a better match between the crystal selected by the customer and the on-chip drive circuitry to power up the oscillator without stressing the crystal. The “l/f” noise of the oscillator circuit is minimized by operating transistors in the triode region instead of the linear region.

13 citations

Patent
14 Mar 2008
TL;DR: In this article, an error of an oscillation frequency of a voltage controlled crystal oscillator 15 is measured by frequency error measurement parts 12, 13a on the basis of a reference one-second pulse from a GPS receiver 11.
Abstract: PROBLEM TO BE SOLVED: To provide a time device for reducing adjustment costs with low electric power consumption while maintaining the required time accuracy. SOLUTION: An error of an oscillation frequency of a voltage controlled crystal oscillator 15 is measured by frequency error measurement parts 12, 13a on the basis of a reference one-second pulse from a GPS receiver 11. A control part 13 controls a control voltage of a D/A converter 14 on the basis of the measurement results, and repeats a frequency calibration operation for the voltage controlled crystal oscillator 15 at a time interval. Each time when the frequency calibration operation is finished, control voltage data are associated with the temperature of the voltage controlled crystal oscillator 15 and stored in a nonvolatile memory 17 as temperature compensation data. In a duration excluding the time of the frequency calibration operation, a power supply of the GPS receiver 11 is turned off by a power supply control circuit 19. In the duration excluding the time of the frequency calibration operation, the control voltage data corresponding to the current temperature of the voltage controlled crystal oscillator 15 are output from the control part 13 to the D/A converter 14 on the basis of the temperature compensation data. COPYRIGHT: (C)2010,JPO&INPIT

12 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20233
20228
20191
201711
201625
201524