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Temperature compensating system of temperature compensated crystal oscillator

A crystal oscillator and 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: 2017-04-26
UNIV OF ELECTRONICS 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 compensating system of temperature compensated crystal oscillator
  • Temperature compensating system of temperature compensated crystal oscillator
  • Temperature compensating system of temperature compensated crystal oscillator

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Embodiment Construction

[0028] 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.

[0029] The invention designs a temperature compensation system of a crystal oscillator with the same number of parameters and higher compensation accuracy. Using this system, the compensation accuracy can be improved under the condition of using the same number of parameters, so as to further improve the temperature stability of the output frequency of the crystal oscillator.

[0030] The sine function can be expanded into the following series form:

[0031]

[0032] The function can be expressed in the form of the sum of sine functions as:

[0033] F(x)=a 1 sin(b 1 ...

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Abstract

The invention discloses a temperature compensating system of a temperature compensated crystal oscillator. The system adopts the sum of sine functions to conduct fitting on the temperature compensating voltages. Compared with polynomial, with the same number of parameters, the sum of sine functions has abundant high-order term information. Compared with the Fourier function, though the 2 fitting methods contain high-order polynomial information, the sum of sine functions has inconsistent polynomial distribution (when n is not equal to infinite), which is to say when the number of parameters is limited, the fitted curve is inconsistent, and the sum of sine functions has higher temperature compensating precision. Also, experiments show that the sum of sine functions is more applicable to AT-cut quartz crystal.

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 increase the temperature of the output frequency of the crystal oscillator. stability. 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 f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L1/02
CPCH03L1/022
Inventor 付玮刘东黄显核
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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