Method for automatically setting high-stability constant temperature crystal oscillator parameter

Abstract

This invention discloses a method for setting parameters of a stable constant temperature crystal oscillator automatically including: an outside computer judges if a central voltage-controlled voltage V and voltage-controlled slope K in a register R in a digital phase-lock loop module D of the processor are set with ID, if not, the processor times automatically to wait for pre-heating an oscillator for a period of time and then a D / A converter presets a low voltage value V0 of the voltage-control sphere to be phase-locked and then the processor reads an accumulated phase value of a period of time N0 to get a determinant frequency F0, then presets a high voltage of the voltage control sphere and reads N1 of a certain of time to get f1, then reads N0 and N1 to get K and V of a stable constant temperature crystal oscillator to write them into R and prints an ID for the successful set.

Description

technical field [0001] The invention relates to a method for automatically setting parameters of a crystal oscillator, in particular to a method for automatically setting parameters of a high-stable constant temperature crystal oscillator (Oven Controlled Crystal Oscillator, OCXO). Background technique [0002] High-stability constant temperature crystal oscillators and crystal oscillators with comparable performance are used as local time-frequency sources and are widely used in various communication products and equipment. In general, high-stable constant-temperature crystal oscillators have many indicators to represent their performance in order to accurately reflect their operation control process. In actual production, it is generally necessary to detect the traction range and voltage control slope index in the voltage control characteristics, and use these data to search for a suitable central voltage control voltage, so that the single board can be quickly controlled ...

AI Technical Summary

Problems solved by technology

[0004] First, instruments such as frequency meters, GPIB cards, and advanced time-frequency sources (such as cesium clocks) are required, which is not convenient for production and cheap implementation;

[0005] Second, it is necessary to connect the reference cable, GPIB cable, serial port cable and the output signal cable of the crystal to be tested. The operation is cumbersome and impractical, and it is difficult to understand the operation if you are not familiar with the configuration;

[0006] Third, high-stable constant-temperature crystal oscillators require preheating of external processes or manual control are not suitable for mass production;

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