阅读说明：本技术 晶体振荡器、振荡频率的调整方法 (Crystal oscillator and method for adjusting oscillation frequency ) 是由 张孟文 于 2018-03-29 设计创作，主要内容包括：一种晶体振荡器、振荡频率的调整方法,晶体振荡器包括：第一振荡电路、频率控制电路以及晶体,第一振荡电路输出具有第一振荡频率的第一驱动信号以驱动所述晶体,所述频率控制电路根据所述第一驱动信号驱动下流过所述晶体的电信号的特征确定频率控制量,并根据所述频率控制量调整所述第一振荡频率,当应用到使得晶体振荡器快速起振的场合时,可以缩短晶体振荡器自然起振的周期,加快起振速度。(A crystal oscillator and an adjusting method of oscillation frequency, the crystal oscillator includes: the frequency control circuit determines a frequency control quantity according to the characteristics of an electric signal which flows through the crystal under the driving of the first driving signal, and adjusts the first oscillation frequency according to the frequency control quantity.)

A crystal oscillator, comprising: the frequency control circuit is used for determining a frequency control quantity according to the characteristics of an electric signal which flows through the crystal under the driving of the first driving signal and adjusting the first oscillation frequency according to the frequency control quantity.

The crystal oscillator of claim 1, wherein the frequency control circuit is configured to determine the frequency control amount based on a characteristic of a current flowing through the crystal driven by the first driving signal.

The crystal oscillator of claim 1, wherein the frequency control circuit is further configured to determine the frequency control amount based on an envelope frequency of an electrical signal driven by the first drive signal to flow through the crystal.

The crystal oscillator of claim 1, further comprising: a conversion circuit configured to convert the first oscillation frequency into a first control signal and convert the frequency control amount into a frequency control signal, wherein the frequency control circuit is further configured to adjust the first oscillation frequency according to the first control signal and the frequency control signal.

The crystal oscillator of claim 4, wherein the frequency control circuit is further configured to determine an injection control signal according to the first control signal and the frequency control signal, and to obtain the adjusted first oscillation frequency according to the injection control signal.

The crystal oscillator of claim 1, further comprising: a first detection circuit for detecting an electrical signal flowing through the crystal.

The crystal oscillation device of claim 1, further comprising: a second detection circuit for detecting a characteristic of an electrical signal flowing through the crystal.

The crystal oscillator of claim 1, wherein the frequency control circuit is further configured to determine the frequency control amount according to a trend of change of a characteristic of an electrical signal driven by the first driving signal and flowing through the crystal.

The crystal oscillator of claim 8, wherein if an absolute value of a difference between the first oscillation frequency and a resonance frequency of the crystal is greater than a set threshold, the frequency control amount is decreased to decrease the first oscillation frequency; or if the absolute value of the difference between the first oscillation frequency and the resonance frequency of the crystal is smaller than a set threshold, increasing the frequency control amount to increase the first oscillation frequency.

A crystal oscillator according to any one of claims 1 to 9, further comprising a second oscillator circuit connected across the crystal, the second oscillator circuit being arranged to start the crystal oscillator when the first oscillator frequency matches the resonant frequency of the crystal.

The crystal oscillator of claim 10, wherein the second oscillating circuit is in an off state during the adjustment of the first oscillating frequency; when the first oscillation frequency is matched with the resonance frequency of the crystal, the first oscillation circuit and the frequency control circuit are in a closed state.

The crystal oscillator of claim 11, wherein the electrical signal flowing through the crystal is characterized by an envelope frequency.

A method for adjusting an oscillation frequency, comprising:

driving a crystal with a first drive signal having a first oscillation frequency;

determining a frequency control quantity according to the characteristics of an electric signal which flows through the crystal under the driving of the first driving signal;

and adjusting the first oscillation frequency according to the frequency control quantity.

The method of claim 13, further comprising:

converting the first oscillation frequency into a first control signal, and converting the frequency control quantity into a frequency control signal;

correspondingly, adjusting the first oscillation frequency according to the frequency control amount includes: adjusting the first oscillation frequency according to the first control signal and the frequency control signal.

The method of claim 14, wherein adjusting the first oscillation frequency according to the first control signal and the frequency control signal comprises: and determining an injection control signal according to the first control signal and the frequency control signal, and obtaining the adjusted first oscillation frequency according to the injection control signal.

The method of claim 13, further comprising: detecting an electrical signal flowing through the crystal, and/or detecting a characteristic of the electrical signal flowing through the crystal.

The method of claim 13, wherein determining a frequency control amount based on a characteristic of an electrical signal driven by the first drive signal through the crystal comprises: and determining a frequency control quantity according to the variation trend of the characteristics of the electric signal flowing through the crystal under the driving of the first driving signal.

The method according to claim 17, wherein if an absolute value of a difference between the first oscillation frequency and the resonance frequency of the crystal is larger than a set threshold, the frequency control amount is decreased so as to lower the first oscillation frequency; and if the absolute value of the difference between the first oscillation frequency and the resonance frequency of the crystal is smaller than a set threshold value, increasing the frequency control quantity to increase the first oscillation frequency.

The method according to any one of claims 13-18, further comprising: starting the crystal oscillator when the first oscillation frequency matches a resonant frequency of the crystal.

The method of claim 19, wherein the second oscillating circuit is turned off during the adjusting of the first oscillating frequency; and when the first oscillation frequency is matched with the resonance frequency of the crystal, the first oscillation circuit and the frequency control circuit are closed.