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Crystal oscillating circuit with temperature compensation

A technology of crystal oscillation and temperature compensation, applied in power oscillators, electrical components, etc., can solve the problems of inability to apply different crystals, cumbersome adjustment process, complex circuit structure, etc., to improve frequency accuracy and temperature stability, simple circuit Structure, the effect of quick compensation

Inactive Publication Date: 2019-03-19
CHINA GRIDCOM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a crystal oscillation circuit with temperature compensation, which is used to solve the problem that the analog temperature compensation technology in the prior art is cumbersome to adjust, the circuit structure is complicated, and it cannot be applied to different crystals.

Method used

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  • Crystal oscillating circuit with temperature compensation
  • Crystal oscillating circuit with temperature compensation
  • Crystal oscillating circuit with temperature compensation

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Embodiment 1

[0044] figure 1 It is a principle diagram of Embodiment 1 of the crystal oscillation circuit with temperature compensation of the present invention. like figure 1 As shown, the crystal oscillation circuit with temperature compensation in this embodiment may include a passive crystal 10, a digitally controlled capacitor array 11, a voltage-controlled varactor 12, and an adjustable proportional to absolute temperature (Proportional To Absolute Temperature, PTAT) voltage Generating module 13 and clock output buffering module 14, wherein, passive crystal 10, ground wire and control signal line 15 are respectively connected with digitally controlled capacitor array 11, passive crystal 10 and adjustable PTAT voltage generating module 13 are respectively connected with voltage-controlled transformer The capacitor 12 is connected, and the clock output buffer module 14 is connected with the passive crystal 10 .

[0045] In a specific implementation process, the passive crystal 10 is ...

Embodiment 2

[0050] figure 2 It is the principle diagram of Embodiment 2 of the crystal oscillation circuit with temperature compensation of the present invention. like figure 2 As shown, the crystal oscillation circuit with temperature compensation of this embodiment is in figure 1 On the basis of the illustrated embodiment, a gain module 16 and a feedback resistor 17 may be further included, wherein the gain module 16 is connected across the two ends of the passive crystal 10 , and the feedback resistor 17 is connected across the two ends of the gain module 16 . The gain module 16 is used to provide energy to the passive crystal 10 to maintain the stability of the reference oscillation signal. Feedback resistor 17 is used to establish the required quiescent operating point of gain block 16 .

[0051] For example, in this embodiment, the feedback resistor 17 can be used to provide a bias voltage to the gain module 16, so that the gain module 16 can work, and the gain module 16 can pr...

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Abstract

The invention discloses a crystal oscillating circuit with temperature compensation. The circuit comprises a passive crystal, a numerical control capacitor array, a voltage controlled varactor, an adjustable PTAT voltage generation module and a clock output buffering module; the passive crystal is used for generating a reference oscillating signal; the numerical control capacitor array is used foradjusting the oscillating frequency of the reference oscillating signal; the adjustable PTAT voltage generation module is used for generating a voltage with a specific temperature coefficient, and sending a control command to the voltage controlled varactor, wherein the control command carries the voltage with the specific temperature coefficient; the voltage controlled varactor is used for receiving the control command, and compensating temperature shifting of the passive crystal according to the voltage with the specific temperature coefficient; the clock output buffering module is connected with the passive crystal, and is used for processing the reference oscillating signal, to acquire an output oscillating signal. By using the technical scheme provided by the invention, the frequencyaccuracy and temperature stability of the reference oscillating signal can be improved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a crystal oscillation circuit with temperature compensation. Background technique [0002] As a stable frequency source, crystal oscillators are widely used in portable electronic equipment and wireless communication technology, and the stability of their frequency to temperature changes is one of the important indicators to measure the performance of crystal oscillators. [0003] Normally, analog temperature compensation technology can be used to compensate the temperature of the crystal oscillator. In the current analog temperature compensation technology, most of the segment compensation methods are used to generate voltages for compensation for the high temperature segment and the low temperature segment respectively. After summing, A compensation voltage that is a cubic function of temperature in the full temperature range is obtained. [0004] However, the exis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/04
CPCH03B5/04
Inventor 臧志斌林大朋史兵毛珊珊陆欣韩正玉刘海斌曹加加王春柯佩纯
Owner CHINA GRIDCOM