Frequency calibration method, device and system for oven controlled crystal oscillator

Abstract

The invention relates to a frequency calibration method, device and system for an oven controlled crystal oscillator. The method comprises the steps that preset test conditions are read and written in the crystal oscillator; output frequencies of the crystal oscillator under the different test conditions are read; least squares curve fitting is performed on relation arrays of the test conditions and the output frequencies to obtain polynomial functions about the test conditions and the output frequencies; the test condition corresponding to the calibration frequency of the crystal oscillator is calculated through the polynomial functions and is written in the crystal oscillator; the output calibration frequency of the crystal oscillator under the test condition corresponding to the calibration frequency is read and verified; if the output calibration frequency meets the range of frequency accuracy, calibration is over; or else, the calibration continues to be performed after coefficients of the polynomial functions are adjusted. According to the frequency calibration method, device and system, the frequency calibration of the oven controlled crystal oscillator can be automatically completed, measuring errors are reduced, and the purposes of performing frequency calibration automatically and accurately and enhancing production efficiency are achieved.

Description

technical field [0001] The invention relates to the technical field of crystal oscillators, in particular to a frequency calibration method, device and system for a constant temperature crystal oscillator. Background technique [0002] At present, the frequency accuracy calibration of the constant temperature crystal oscillator is carried out by manually controlling the test equipment, changing the frequency output of the crystal oscillator by manually changing the temperature value, and then manually determining whether it is within the frequency accuracy range of the crystal. This method of changing the frequency parameters of the crystal oscillator through manual debugging is not scientific and accurate enough, and it is easy to cause inaccurate frequency accuracy or artificial selection errors, resulting in the constant temperature crystal oscillator not meeting its required output accuracy, and even unable to continuously ensure stability. output; in addition, low produ...

AI Technical Summary

Problems solved by technology

This method of changing the frequency parameters of the crystal oscillator through manual debugging is not scientific and accurate enough, and it is easy to cause inaccurate frequency accuracy or artificial selection errors, resulting in the constant temperature crystal oscillator not meeting its required output accuracy, and even unable to continuously ensure stability. output; in addition, low production efficiency is also a great disadvantage of manual debugging, which is far from meeting the high performance indicators of constant temperature crystal oscillators

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