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Crystal oscillating circuit

A crystal oscillator circuit and crystal oscillation technology, applied in the electronic field, can solve problems such as low reliability, affecting the output frequency stability of crystal oscillators, and poor phase noise, so as to optimize product phase noise, reduce interference and crosstalk, and improve stability. Effect

Inactive Publication Date: 2012-09-19
SUZHOU HUIFEI INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, limited by the drive capability of the drive circuit, the existing crystal oscillator circuit has low reliability for start-up and stable oscillation, and poor phase noise, which affects the stability of the output frequency of the crystal oscillator.

Method used

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Embodiment Construction

[0012] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly defined.

[0013] like figure 1 As shown, embodiments of the present invention include:

[0014] A crystal oscillator circuit includes a crystal oscillator circuit 1 and a drive circuit 2. The crystal oscillator circuit 1 is connected to a digital compensation circuit 3. The input and output ends of the crystal oscillator circuit 1 are respectively connected to capacitors C1 and C2. The capacitors C1 and C2 They are grounded respectively, and the crystal oscillator circuit 1 and the digital compensation circuit 3 are connected through a noise reduction circuit 4 .

[0015] The digital compensation circuit 3 includes a temperature measurement circuit, a te...

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Abstract

The invention discloses a crystal oscillating circuit. The crystal oscillating circuit comprises a crystal oscillation circuit and a driving circuit. The crystal oscillation circuit is connected with a digital compensation circuit, the input end and the output end of the crystal oscillation circuit are respectively connected with capacitors C1 and C2 which are grounded, and the crystal oscillation circuit and the digital compensation circuit are connected by a noise reduction circuit. According to the crystal oscillating circuit, the mutual interference between the crystal oscillation circuit and the digital compensation circuit is avoided, the phase noise of the crystal oscillating circuit is optimized, the interference and the crosstalk on a signal channel are weakened greatly, meanwhile, as the two ends of the crystal oscillation circuit are connected with the two capacitor in parallel, the start-oscillation condition of a crystal oscillator is lowered, the start-oscillation reliability is improved, the allowance between the maximum crystal oscillation load and the driving impedance is enlarged, and the oscillating stability is improved.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a crystal oscillator circuit. Background technique [0002] At present, crystal oscillator circuits (crystal oscillator circuits) have been widely used in color TVs, computers, remote controls and communication equipment to generate clock signals for data processing equipment and provide reference signals for specific systems. There are many types of crystal oscillator circuits, including ordinary crystal oscillator circuits, voltage-controlled crystal oscillator circuits, temperature-compensated crystal oscillator circuits, thermostatically-controlled crystal oscillator circuits, and digital-compensated crystal oscillator circuits. [0003] Then, due to the limitation of the driving capability of the drive circuit, the existing crystal oscillator circuit has low reliability in starting and stabilizing oscillation, and has poor phase noise, which affects the stability of the output fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/04H03B5/06
Inventor 王清荣
Owner SUZHOU HUIFEI INFORMATION TECH
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