A crystal oscillator and frequency search method
A crystal oscillator and frequency search technology, applied in power oscillators, electrical components, etc., can solve problems such as large time consumption, slow chip response capability, uncontrollable search times, etc.
Active Publication Date: 2017-03-29
SHENZHEN RENERGY TECH
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[0013] The purpose of the present invention is to provide a crystal oscillator and a frequency search method, aiming to solve the problem of uncontrollable search times and slow response capability of the chip caused by large time consumption in the search algorithm in the prior art
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[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0055] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.
[0056] An embodiment of the present invention provides a capacitor array tuning method for a crystal oscillator, such as image 3 As shown, the tuning method includes the following steps:
[0057] S101. Calculate and adjust the capacitance value of each capacitor in the capacitor array according to a predetermined formula, so that the frequency tuning step of the crystal oscillator is a constant value to obtain a linear frequency tuning curve;
[0058] S102. Search for...
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The invention relates to the technical field of crystal oscillator, the invention provides a crystal oscillator and a frequency searching method. The method comprises the following stepsof computing and adjusting a capacitance value of each small capacitor in a capacitor array according to a predetermined formula to make a frequency tuning step length of the crystal oscillator be a constant value, thereby obtaining a linear frequency tuning curve. By taking value of each small capacitor in the capacitor array according to the predetermined formula to make the frequency tuning step length be the constant value, and then obtaining the linear frequency tuning curve of the crystal oscillator, a target frequency is searched according to the linear frequency tuning curve, and the target frequency can be obtained through only one search step. The execution time of a chip is greatly reduced, the quick response capacity of the chip is improved, and then the time of awakening the chip from standby is shortened.
Description
technical field [0001] The invention relates to the technical field of crystal oscillators, in particular to a crystal oscillator and a frequency search method. Background technique [0002] In modern communication systems, due to the characteristics of high precision and high stability, crystal oscillators are widely used in common consumer electronics products such as TVs, computers, mobile phones, and tablet computers, and are also used in frequency synthesizers in wireless communication systems , clock signal generators in data processing equipment and reference clock signal generation circuits in specific systems. Like other semiconductor circuits, low power consumption, high integration, and high frequency accuracy have become the future development trend of crystal oscillators. Although the frequency of the crystal oscillator is accurate enough, usually the deviation is only about + / -50ppm, but for some more demanding applications, this accuracy is still not accurate...
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IPC IPC(8): H03B5/04
Inventor 许建超赵琮汤江逊欧阳振华许志玲
Owner SHENZHEN RENERGY TECH