Closed-loop temperature compensation method and device for clock crystal oscillator

A technology of crystal oscillator and temperature compensation, applied in power oscillators, electrical components, etc., can solve the problems of inaccurate compensation results and inability to guarantee compensation results, and achieve the effects of low cost, accurate temperature compensation, and small system volume

Active Publication Date: 2012-07-04
苏州银河龙芯科技有限公司
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Problems solved by technology

[0007] At present, the cost of this soft compensation method is low, but because it is an open-loop compensation, the consistency of the frequency-temperature characteristic curve, the consistency of the temperature sensor, the consistency of the reference voltage of the A/D

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  • Closed-loop temperature compensation method and device for clock crystal oscillator
  • Closed-loop temperature compensation method and device for clock crystal oscillator
  • Closed-loop temperature compensation method and device for clock crystal oscillator

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Embodiment Construction

[0039] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, several technical terms related to the present invention are introduced below.

[0040] Quartz crystal oscillator: It is a resonant device made by using the piezoelectric effect of a quartz crystal (crystal of silicon dioxide). Its basic composition is roughly: cut a thin slice (abbreviated as a wafer) from a quartz crystal at a certain azimuth angle. , it can be square, rectangular or circular, etc.), coat its two corresponding surfaces with a silver layer as electrodes, solder a lead on each electrode and connect it to the pin, plus the package shell A quartz crystal resonator is formed, referred to as a quartz crystal or crystal oscillator for short.

[0041] 32768Hz quartz crystal is often used as a clock crystal.

[0042] In order to make the above objects, features and advantages of the present invention more comprehensible, specific imp...

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Abstract

The invention provides a closed-loop temperature compensation method and a closed-loop temperature compensation device for a clock crystal oscillator. A second pulse of a 32768Hz quartz crystal is continuously corrected by using an accurate high-frequency quartz crystal until the number of high-frequency pulses of a high-frequency pulse signal which is read in a time gate generated by the 32768Hz quartz crystal is equal to that of the high-frequency pulses which are theoretically accurate. Because the 32768Hz quartz crystal can be calibrated at any temperature, the frequency offset of the 32768Hz quartz crystal caused by temperature difference is compensated. In a closed-loop temperature compensation mode which is provided by the embodiment of the invention, the frequency temperature characteristic curve shape of a clock crystal is unrelated, and consistency is not required. Therefore, by adoption of a temperature soft compensation method provided by the invention, accurate temperature compensation can be realized. The cost of the temperature soft compensation method is low, and the size of a corresponding system is small.

Description

technical field [0001] The invention relates to the technical field of clock precision temperature compensation, in particular to a closed-loop temperature compensation method and device for a clock crystal oscillator. Background technique [0002] At present, in addition to standard sources with particularly high requirements, high-precision clock frequencies used in industry and daily life mainly come from quartz crystal oscillators. At present, the frequency of the quartz crystal oscillator used in clocks at home and abroad is 32768Hz. [0003] See attached figure 1 , the figure is the frequency temperature characteristic curve of 32768Hz quartz crystal oscillator. The frequency deviation ratio ΔF / F of the 32768Hz quartz crystal oscillator in the range of -30 to +60°C is about (+40)ppm to (-150)ppm (ppm means one millionth), so the clock error generated every day Up to 15 seconds or more. [0004] Therefore, if a higher clock accuracy is to be achieved, it is necessar...

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Application Information

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IPC IPC(8): H03B5/04
Inventor 王瑞毅任振东陈仲平
Owner 苏州银河龙芯科技有限公司
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