High-stability constant-temperature digital voltage-controlled crystal oscillator system

Abstract

The invention relates to the technical field of crystal oscillator frequency regulating devices, in particular to a high-stability constant-temperature digital voltage-controlled crystal oscillator system. The high-stability constant-temperature digital voltage-controlled crystal oscillator system comprises a digital-to-analog converter, a first voltage stabilizer, a constant-temperature crystal oscillator and a thermostatic bath, wherein the digital-to-analog converter, the first voltage stabilizer and the constant-temperature crystal oscillator are limited by the respective temperature characteristic in a working process, so that the output frequency of the constant-temperature crystal oscillator generates drifting. The digital-to-analog converter, the first voltage stabilizer and the constant-temperature crystal oscillator in the system are positioned in the thermostatic bath, so that the temperature drifting can be effectively suppressed, and thus the output frequency of the constant-temperature crystal oscillator is stable, and the precision of the output frequency of a clock system is improved.

Description

technical field [0001] The invention relates to the technical field of crystal oscillator frequency adjustment devices, in particular to a high-stable constant-temperature digital voltage-controlled crystal oscillator system. Background technique [0002] Crystal oscillators have always occupied an important position in the field of electronic technology. As standard frequency sources or pulse signal sources, they provide frequency references, and their applications have been extended to all important systems. During the use of the crystal oscillator, due to factors such as the aging effect of the crystal oscillator, the output frequency of the crystal oscillator will change with the time of use, and the output frequency of the crystal oscillator needs to be adjusted through a voltage control voltage. [0003] With the rapid development of the communication industry and the advent of the 4G era, communication equipment has higher and higher requirements for the clock system....

AI Technical Summary

Problems solved by technology

However, the DAC (Digital to Analog Converter) or PWM (Pulse Width Modulation, Pulse Width Modulation) digital-to-analog conversion voltage outside the crystal oscillator has a large temperature drift, which directly leads to a large frequency drift of the crystal oscillator. Exceeding the requirements of communication equipment for clock system indicators, it can no longer meet the communication needs

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