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Temperature compensation system of crystal oscillator

A crystal oscillator, temperature compensation technology, applied in the direction of output stability, electrical components, etc., can solve the problem of limited sampling points of the compensation curve

Inactive Publication Date: 2015-03-25
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the sampling points of the compensation curve are limited, such as figure 2 , the position shown in the box is the sampling point obtained by the experiment

Method used

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  • Temperature compensation system of crystal oscillator
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  • Temperature compensation system of crystal oscillator

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0026] The invention designs a temperature compensation system of a crystal oscillator with the same number of parameters and higher compensation accuracy. By using this system, the compensation accuracy can be improved under the condition of using the same number of parameters, thereby improving the temperature stability of the output frequency of the crystal oscillator.

[0027] The sine function and cosine function can be expanded into the following series form:

[0028] sin x = Σ n = ...

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Abstract

The invention discloses a temperature compensation system of a crystal oscillator. A Fourier function base is used for fitting. An experiment shows that the Fourier function base contains more abundant high-order information, so that under the condition that the Fourier function base is used for fitting a compensation curve, with the same number of parameters, more abundant high-order information can be contained, and higher temperature compensation precision can be obtained. In addition, according to the temperature compensation system of the crystal oscillator, real-time communication between an upper computer (PC) and an ARM control unit is achieved, the influence of an actual working state effect of a temperature compensation oscillator circuit and an effect that the precision internal reference voltage of the temperature compensation oscillator is insufficient to the control voltage obtained by the temperature compensation system is already taken into consideration.

Description

technical field [0001] The invention belongs to the technical field of crystal oscillators, and more specifically relates to a temperature compensation system of a crystal oscillator (Temperature Compensate Crystal Oscillator, hereinafter referred to as TCXO), which is used to improve temperature compensation and improve the stability of the output frequency of the crystal oscillator sex. Background technique [0002] Crystal oscillators are widely used in the electronic information industry, and precise crystal oscillators play an important role in the technological development of communications, electronic instruments, aerospace, national defense and military industries. [0003] As the ambient temperature changes, the crystal oscillator output frequency will drift. The change of output frequency with temperature is as follows: figure 1 As shown, such a graph is usually defined as a frequency-temperature characteristic curve. [0004] In order to improve the frequency-t...

Claims

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Application Information

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IPC IPC(8): H03L1/02
Inventor 付玮刘东黄显核
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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