Automatic calibration method for frequency of crystal oscillator
A crystal oscillator, automatic calibration technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of high price, economical and time-ineffective spectrum analyzer, and achieve the effect of overcoming cumbersome steps, time and cost economy
Active Publication Date: 2015-05-20
SHAANXI FENGHUO ELECTRONICS
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Problems solved by technology
This method must rely on a spectrum analyzer (compared to the signal source, the price of the spectrum analyzer is much higher), and requires a certain disassembly of the device (in order to ensure the stability of the device, the frequency adjustment potentiometer is generally not exposed to the outside of the device), which is not economical and time-wise
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[0019] The present invention will be further described below in conjunction with accompanying drawing:
[0020] refer to figure 1 , which is a block diagram of a circuit structure of an automatic frequency calibration method for a crystal oscillator of the present invention. The frequency automatic calibration method of the crystal oscillator comprises the following steps:
[0021] The automatic frequency calibration device of the crystal oscillator is set, and the automatic frequency calibration device of the crystal oscillator includes a digital potentiometer, and the tap of the digital potentiometer is electrically connected to the voltage control pin of the crystal oscillator, and the control of the digital potentiometer The terminal is used to access the control signal.
[0022] Specifically, the frequency automatic calibration device of the crystal oscillator also includes a first mixer, a digital potentiometer control module, a phase-locked loop, and a low-noise ampli...
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The invention belongs to the technical field of automatic calibration of frequency of radio equipment and particularly relates to an automatic calibration method for the frequency of a crystal oscillator. The automatic calibration method for the frequency of the crystal oscillator comprises the following steps: S1, installing an automatic calibration device for the frequency of the crystal oscillator, wherein the automatic calibration device for the frequency of the crystal oscillator comprises a digital potentiometer; a tap of the digital potentiometer is electrically connected with a voltage control pin of the crystal oscillator, and the control end of the digital potentiometer is used for control signals to be accessed; S2, acquiring the actual accuracy beta of the crystal oscillator and the variation alpha of the accuracy of the crystal oscillator when the tap of the digital potentiometer moves by a unit step to obtain a step number epsilon that the tap of the digital potentiometer needs to move; S3, according to the step number epsilon that the tap of the digital potentiometer needs to move, sending a corresponding signal to the control end of the digital potentiometer to enable the tap of the digital potentiometer to move to a corresponding position.
Description
technical field [0001] The invention belongs to the technical field of frequency self-calibration of radio equipment, in particular to a frequency self-calibration method of a crystal oscillator. Background technique [0002] The crystal oscillator has an aging effect, and its output frequency will shift with time. In some occasions that require high frequency accuracy (when the frequency accuracy requirement is greater than the annual aging rate), the crystal needs to be calibrated frequently. The current calibration scheme is: connect the frequency output terminal of the whole machine or unit to a spectrum analyzer (standard instrument, qualified for calibration), observe the frequency offset displayed on the spectrum analyzer, and manually adjust the voltage control terminal of the crystal oscillator. The method of analog potentiometer achieves the purpose of frequency calibration. This method must rely on a spectrum analyzer (compared to the signal source, the price of ...
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IPC IPC(8): H03L7/099
Inventor 肖辉星蒲文飞
Owner SHAANXI FENGHUO ELECTRONICS