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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Papers
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29 May 1991
TL;DR: In this paper, a voltage-controlled temperature compensated crystal oscillator (VCTCXO) with a 2-port crystal resonator with a special electrode structure was developed.
Abstract: Generally, the frequency-vs.-temperature characteristic of voltage-controlled temperature compensated crystal oscillators (VCTCXO) varies when their oscillation frequency is shifted. In an effort to solve the problem, the authors developed a VCTCXO using a 2-port crystal resonator with a special electrode structure. The VCTCXO with the 2-port crystal resonator can have two load capacitances, i.e., a load capacitance for temperature compensation and a load capacitance for shifting the oscillation frequency. Therefore, the VCTCXO can compensate for temperature changes and shift the oscillation frequency independently. An electric equivalent circuit for the 2-port crystal resonator is introduced, and fundamental equations are derived from the equivalent circuit for determining the extent to which the oscillation frequency varies with the load capacitances, with comparison made between measured and calculated values. >
7 citations
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06 May 1969
7 citations
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25 May 1983
TL;DR: In this article, a temperature compensated crystal oscillator is used to provide linearly temperature sensitive outputs which are employed to generate a series of polynomial functions of Chebyshevlike form which are summed and used to control a varicap diode in the oscillator feedback path.
Abstract: A temperature compensated crystal oscillator in which the base emitter voltage of transistors in an integrated circuit is used to provide substantially linearly temperature sensitive outputs which are employed to generate a series of polynomial functions of Chebyshev-like form which are summed and used to control a varicap diode in the oscillator feedback path.
7 citations
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12 Apr 2010TL;DR: In this article, an operational transconductance amplifier (OTA) is used as the DC bias feedback of a crystal oscillator to minimize temperature, voltage and process corner variations thereof, and thereby improve the reliability of crystal oscillators operation at ultra low power levels.
Abstract: An operational transconductance amplifier (OTA) is used as the DC bias feedback of a crystal oscillator to minimize temperature, voltage and process corner variations thereof, and thereby improve the reliability of crystal oscillator operation at ultra low power levels.
7 citations
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11 Jul 2014TL;DR: In this paper, the authors provided methods of switching guest-host dual-frequency liquid crystals by using a back flow in the case of a shutter having a dual frequency liquid crystal layer between two transparent substrates.
Abstract: Provided are methods of switching guest-host dual frequency liquid crystals by using a back flow. In the case of a shutter having a dual frequency liquid crystal layer between two transparent substrates, such a method includes: applying a first voltage having a first frequency to the dual frequency liquid crystal layer; and applying a second voltage having a second frequency to the dual frequency liquid crystal, the second frequency being higher than the first frequency, wherein the second voltage is higher than a threshold voltage that generates a back flow around liquid crystals of the dual frequency liquid crystal layer, and the first voltage is lower than the threshold voltage.
7 citations