Automatic crystal oscillator temperature compensation system

Abstract

The invention discloses a crystal oscillator temperature compensation system. The automatic crystal oscillator temperature compensation system comprises a high / low temperature test box, a frequency gauge, a DC voltage stabilizing power source, a programmable DC voltage stabilizing power source and a host, wherein a to-be-compensated voltage controlled crystal oscillator is disposed in the high / low temperature test box, output frequency of the to-be-compensated voltage controlled crystal oscillator is measured by the frequency gauge, a power source voltage is provided by the DC voltage stabilizing power source to the to-be-compensated voltage controlled crystal oscillator, the high / low temperature test box is controlled by the host to realize temperature adjustment, under the present temperature, the programmable DC voltage stabilizing power source is controlled for providing a proper voltage to the to-be-compensated voltage controlled crystal oscillator to realize voltage compensation of the to-be-compensated voltage controlled crystal oscillator to make output frequency after voltage compensation be equal to target frequency, corresponding frequency offsets and compensation voltages under different temperatures can be acquired, a frequency offset-compensation voltage data table is acquired and is stored to a compensation voltage generation device of a voltage controlled crystal oscillator, so automatic temperature compensation control on the voltage controlled crystal oscillator is realized, and timeliness and accuracy of automatic temperature compensation are improved.

Description

technical field [0001] The invention belongs to the technical field of crystal oscillators, and more specifically relates to an automatic temperature compensation system for crystal oscillators. Background technique [0002] Crystal oscillators (Temperature Compensate Xtal (crystal) Oscillator, TCXO) are widely used in the electronic information industry and play the role of "heart" in electronic systems. In recent years, the development of technologies such as communications, electronic instruments, aerospace, and national defense has put forward higher and higher requirements for the accuracy and stability of crystal oscillators. [0003] The output frequency of a general crystal oscillator will drift with the change of the ambient temperature, which can be approximated as a cubic curve by using the temperature-frequency characteristic, which is: [0004] f(T)=a 3 (T-T 0 ) 3 +a 1 (T-T 0 )+a 0 (1) [0005] Among them, a 3 is the cubic coefficient term, a 1 is a c...

AI Technical Summary

Problems solved by technology

However, due to the complex calculation process, there is an inevitable delay, which affects the real-time performance of the compensation voltage, thereby affecting the compensation accuracy of the temperature compensated crystal oscillator

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