A design method of stress compensation film for AT-cut temperature compensated crystal oscillator

A stress compensation and design method technology, applied in computer-aided design, design optimization/simulation, calculation, etc., can solve problems such as high cost and complex processing, and achieve the effect of solving cost problems, strong operability, and avoiding errors

Active Publication Date: 2019-03-29
XIDIAN UNIV
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Problems solved by technology

Due to technical reasons, the above-mentioned improvement of the precision index of the crystal oscillator is achieved through voltage control of an external circuit. However, the existing voltage control compensation method is complex in processing and high in cost.

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  • A design method of stress compensation film for AT-cut temperature compensated crystal oscillator
  • A design method of stress compensation film for AT-cut temperature compensated crystal oscillator
  • A design method of stress compensation film for AT-cut temperature compensated crystal oscillator

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Embodiment Construction

[0029] One can avoid the error caused by adjusting and compensating the shape and position of the film according to manual experience, and can solve the actual processing cost, and has strong operability. A stress compensation film design method for AT-cut temperature-compensated crystal oscillators has practical significance for the design and development of high-stability temperature-compensated crystal oscillators.

[0030] Such as figure 1 As shown, the temperature-frequency characteristic curve of the AT-cut crystal is a cubic function curve, and the force-frequency characteristic curve has a good linear relationship. By coating a layer of metal film with different thermal expansion coefficients on the crystal surface, when the temperature rises or falls, the film and Thermal stress is generated between the crystals, and the force-frequency characteristics pull the temperature-frequency curve, so that the temperature-frequency characteristics of the crystals are improved....

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Abstract

The invention relates to a design method of stress compensation film for AT-cut temperature compensated crystal oscillator, which is characterized in that: at least three steps are included: an ANSYSthree-dimensional solid simulation model of AT-cut temperature compensating crystal resonator is constructed according to piezoelectric coupling finite element equation and dynamic equation; The crystal stress distribution cloud map corresponding to two different coating schemes is obtained by ANSYS simulation, The greater the stress applied to the x-axis direction of the crystal wafer under the same temperature, the more obvious the compensation effect of the temperature-frequency characteristic curve is obtained, and the optimal coating compensation is obtained. The invention provides design method of stress compensation film for AT-cut temperature compensated crystal oscillator which can avoid the error caused by adjusting the shape and position of the compensation film according to the artificial experience, can solve the actual processing cost, has strong operability, and is suitable for the design and development of the high stability temperature-compensated crystal oscillator.

Description

technical field [0001] The invention relates to a stress compensation film design method for temperature-compensated crystal oscillators based on ANSYS design simulation results. In particular, a method for designing a stress compensation film for an AT-cut temperature-compensated crystal oscillator. Background technique [0002] The temperature-frequency characteristic compensation of the crystal oscillator is a long-term topic of crystal oscillator technology. The frequency deviation of the crystal oscillator will change with the temperature. Usually, choosing a crystal oscillator with a frequency deviation of 10-30 / PPM will not affect the use, but for some special applications, the frequency of the crystal oscillator will be required. Partially above 5-10 / PPM or higher. Due to technical reasons, the above-mentioned improvement of the precision index of the crystal oscillator is achieved through voltage control of an external circuit. However, the existing voltage control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/08G06F2119/06G06F30/23
Inventor 苗苗张艺李智奇李皖周渭张雪萍冯娜娜
Owner XIDIAN UNIV
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