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Crystal static capacitance canceling circuit

A technology of static capacitors and crystals, applied in electrical components, power oscillators, etc., can solve the problems of stopping vibration, limited negative resistance of crystal oscillator chip circuits, and increasing crystal production costs.

Pending Publication Date: 2020-10-27
THE 13TH RES INST OF CHINA ELECTRONICS TECH GRP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystal oscillator includes a crystal resonator and a crystal oscillator chip. Among them, the crystal static capacitance C0 is an equivalent parameter to express the parasitic capacitance of the crystal resonator. Its existence will reduce the negative resistance of the crystal oscillator chip circuit to a certain extent, and reduce the crystal oscillation. Oscillation margin of the oscillator may cause unstable oscillation or even stop oscillation
[0003] In the prior art, the influence of the crystal static capacitance on the negative resistance of the crystal oscillator chip is generally reduced by improving the crystal process design and strictly controlling the size of the crystal static capacitance, but this method has limited influence on the negative resistance of the crystal oscillator chip circuit, and will increase the crystal production cost

Method used

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Embodiment Construction

[0024] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0026] Exemplary, figure 1 For the overall circuit of the crystal oscillator, R f Provide bias for the inverter so that it works in the linear region to have a larger gain; Together with the stray ...

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Abstract

The invention is applicable to the technical field of crystal oscillators, and provides a crystal static capacitance canceling circuit, which comprises a blocking module and a static capacitance canceling module, and the static capacitance canceling module comprises a blocking unit; the blocking module is suitable for being connected with a first end of a crystal, is also connected with the canceling module and is used for carrying out direct-current isolation with other circuits in a crystal oscillation chip of the crystal oscillator; and the static capacitance canceling module is used for increasing the negative resistance of the oscillation circuit, and the DC blocking unit is suitable for being connected with the second end of the crystal and is used for performing DC isolation with other circuits in the crystal oscillation chip. By debugging the resistor and the capacitor in the static capacitance canceling module, the negative resistance of the crystal oscillation chip circuit can be increased, so that the crystal oscillator maintains stable and reliable oscillation.

Description

technical field [0001] The invention belongs to the technical field of crystal oscillators, in particular to a crystal static capacitance cancellation circuit. Background technique [0002] The crystal oscillator has the characteristics of high frequency stability and low phase noise. It can be used as a reference signal source for various systems and is widely used in electronic systems of military and civilian products. The crystal oscillator includes a crystal resonator and a crystal oscillator chip. Among them, the crystal static capacitance C0 is an equivalent parameter to express the parasitic capacitance of the crystal resonator. Its existence will reduce the negative resistance of the crystal oscillator chip circuit to a certain extent, and reduce the crystal oscillation. Oscillation margin of the oscillator may cause unstable oscillation or even stop oscillation. [0003] In the prior art, the influence of the crystal static capacitance on the negative resistance o...

Claims

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Application Information

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IPC IPC(8): H03B5/04H03B5/30
CPCH03B5/04H03B5/30
Inventor 方修成王占奎刘兰坤徐淑壹要志宏陈中平逄杰吴立国杨璋娟狄世杰杨慧聪赵玮娜
Owner THE 13TH RES INST OF CHINA ELECTRONICS TECH GRP CORP
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