AT-cut temperature compensation crystal oscillator of comb-shaped metal film

Abstract

A temperature compensation crystal oscillator of a comb-shaped metal film comprises a cuboid quartz wafer, wherein the upper surface and the lower surface of the quartz wafer are rectangular, and two rectangular bosses are arranged on the upper surface of the quartz wafer. Central electrodes are plated on the upper and lower surfaces of the quartz wafer; an extension layer is arranged at one corner of each central electrode; two ends of the comb-shaped metal film are respectively placed on two rectangular bosses on the upper surface of the quartz wafer, and the comb-shaped metal film is separated from the central electrode; the comb-shaped metal film is formed by arranging a plurality of metal strips at equal intervals, the plurality of metal strips are symmetrically arranged about the y axis, the length direction of the metal strips is consistent with the x-axis direction of the rectangular quartz wafer, and the midpoints of the metal strips are on the z axis; and the thermal expansion coefficient of the material of the metal strip is greater than that of the quartz wafer 1. The comb-shaped metal film does not increase the overall mass of the electrode area and does not increase the load effect of the area. And the comb-shaped structure is adopted, so that the force applied by the compensation strip in the z direction can be reduced, and the influence on the working mode of the crystal oscillator is reduced or other parasitic modes are avoided.

Description

technical field [0001] The invention relates to a quartz crystal resonator, in particular to an AT-cut temperature-compensated crystal oscillator with a comb-shaped metal film [0002] technical background [0003] Quartz crystal resonators are the core components of frequency reference sources in modern electronic communication information systems. With the development of related technologies in the fields of aviation, aerospace, electronics, communications and machinery, the precision requirements for quartz crystal resonators are getting higher and higher . Improving the stability of the frequency of quartz crystal resonators has become an important issue. [0004] The temperature-frequency characteristics of the quartz crystal will cause its resonant frequency to change when the operating temperature changes. Its temperature-frequency characteristics are mainly related to the cut type of the quartz crystal. Common cut types include AT cut, BT cut and SC cut. etc. Among ...

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Problems solved by technology

[0010] A crystal resonator using strip-shaped compensation film stress compensation (application number: 202010238766.9) uses the above method to perform temperature compensation based on the metal film and uses the force-frequency characteristics of the quartz crystal oscillator. It has a relatively simple structure, small size, low power consumption and low cost. Low advantages, but because the compensation strip is placed on the electrode and in contact with the electrode, it will not only cause the metal film to generate stress in the x direction when the working temperature changes, but also generate a relatively large stress in the z direction, resulting in some The emergence of parasitic modes; and it will also increase the overall mass of the electrode area, causing a more serious loading effect, which will affect the performance of the crystal oscillator

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