Oven controlled crystal oscillator and working method thereof

Abstract

The invention belongs to the technical field of an oven controlled quartz crystal oscillator and particularly relates to an oven controlled crystal oscillator. The oven controlled crystal oscillator comprises an analog switch which is connected with a main vibration level of the oven controlled crystal oscillator and a temperature compensated crystal oscillator, and is also connected with a temperature sensing circuit; and a voltage stabilizing circuit (1) which is connected with a temperature control circuit and the temperature sensing circuit, wherein the main vibration level of the oven controlled crystal oscillator is connected with an isolation buffer level (1), the temperature compensated crystal oscillator is connected with the isolation buffer level (2), and an amplification outputlevel is connected with the isolation buffer level (1) and the isolation buffer level (2). When the oven controlled crystal oscillator is started up, an output frequency is a frequency of the temperature compensated crystal oscillator, and when a temperature in a constant temperature zone is risen to be approximate to a constant temperature point, the output frequency is switched to the frequencyof the oven controlled crystal oscillator, so the purpose of reducing starting frequency difference of the oven controlled crystal oscillator is achieved.

Description

technical field [0001] The invention belongs to the technical field of constant temperature quartz crystal oscillators, in particular to a constant temperature crystal oscillator and its working method. Background technique [0002] Constant temperature crystal oscillators are widely used in communication, radar, navigation, remote sensing and measuring instruments because of their high frequency stability and excellent aging characteristics. As frequency sources or time references for electronic systems, their performance directly affects or even determines the performance of the electronic system. [0003] After the constant temperature crystal oscillator works stably, its frequency is near the nominal frequency, and the frequency accuracy is very high, usually better than 1E-7. However, when starting up, the initial frequency of the constant temperature crystal oscillator deviates greatly from the nominal frequency, reaching tens of ppm. This frequency deviation is calle...

AI Technical Summary

Problems solved by technology

In this case, there are two problems with the output frequency of the constant temperature crystal oscillator. One is that the deviation between the frequency and the nominal frequency is too large, which will cause the whole machine to work abnormally during the startup phase; For a few minutes) the frequency will change drastically and become unstable. When it is applied to radio stations and other occasions, it will cause howling phenomenon due to the drastic change of frequency, which will affect the use

Images