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Method and device for frequency calibration of temperature-compensated crystal oscillator in mobile terminal

A temperature compensation, mobile terminal technology, applied in power oscillators, electrical components, etc., can solve the problem of inaccurate temperature compensation crystal oscillator frequency calibration, improve the calibration accuracy, and prevent errors in the calibration results.

Active Publication Date: 2017-06-30
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, when the temperature reaches a certain value, the frequency calibration of the temperature-compensated crystal oscillator is not accurate in the existing frequency calibration method

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  • Method and device for frequency calibration of temperature-compensated crystal oscillator in mobile terminal
  • Method and device for frequency calibration of temperature-compensated crystal oscillator in mobile terminal
  • Method and device for frequency calibration of temperature-compensated crystal oscillator in mobile terminal

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Embodiment Construction

[0023] In the prior art solutions, the temperature compensation crystal oscillator is usually firstly compensated by using a direct temperature compensation circuit or an indirect temperature compensation circuit, and then the frequency calibration of the temperature compensated crystal oscillator is performed. The existing frequency calibration method assumes that the relationship between the frequency response of the temperature-compensated crystal oscillator and the temperature transformation is linear, but when the temperature reaches a certain value, the frequency response of the temperature-compensated crystal oscillator does not change linearly with the temperature, resulting in temperature compensation. The frequency calibration of crystal oscillators is not precise.

[0024] In the embodiment of the present invention, since multiple voltage values ​​are used to control the oscillation of the temperature-compensated crystal oscillator respectively, the parameters of the...

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Abstract

A method and device for calibrating the frequency of a temperature-compensated crystal oscillator in a mobile terminal, the method for calibrating the frequency of a temperature-compensated crystal oscillator in a mobile terminal includes: using more than two preset voltage values ​​to sequentially control the oscillation of the temperature-compensated crystal oscillator in the mobile terminal ; Obtain the oscillation frequency of the temperature-compensated crystal; according to the oscillation frequency of the temperature-compensated crystal, k and b are obtained by using the least squares algorithm, and k and b are substituted into the formula F=k×U+b to obtain the calibrated The oscillation frequency of the temperature-compensated crystal oscillator, and the F is the calibrated oscillation frequency of the temperature-compensated crystal oscillator. By adopting the above method and device, the frequency calibration accuracy of the temperature compensation crystal oscillator can be effectively improved.

Description

technical field [0001] The invention relates to the field of calibration of electronic devices, in particular to a frequency calibration method and device for a temperature-compensated crystal oscillator in a mobile terminal. Background technique [0002] The temperature compensated crystal oscillator is a type of quartz crystal oscillator that reduces the amount of oscillation frequency variation caused by ambient temperature changes through an additional temperature compensation circuit. Since the temperature-compensated crystal oscillator has high frequency stability, is small in size, and can start quickly under low current, it has been widely used in radio frequency chips of wireless communication equipment. [0003] When the temperature compensation crystal oscillator is working, the output frequency will produce a frequency offset with the change of temperature. In the existing technical scheme, the temperature compensation crystal oscillator is usually firstly compen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/04H03B5/32
Inventor 薛丰廷
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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