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在导航、通讯、精密计时、测频等仪器中都要求使用高稳定度的晶体振荡器。但由于受晶体的温度频率特性的影响,在温度变化范围较大的使用条件下,频率稳定度下降。因而迫切需要对晶体振荡器进行温度补偿。本文提出的使用微机进行晶体振荡器的温度补偿方法,可以省去大量的理论计算和繁冗的试验,而且可获得较高的补偿精度。同时还介绍了变容二极管的筛选方法和误差分析。
In navigation, communications, precision timing, frequency measurement and other equipment require the use of high stability of the crystal oscillator. However, due to the temperature and frequency characteristics of the crystal under the conditions of use in a wide range of temperature changes, the frequency stability decreased. Therefore, there is an urgent need for temperature compensation of the crystal oscillator. The proposed method of temperature compensation of crystal oscillator using a microcomputer can save a lot of theoretical calculations and burdensome tests, and can obtain higher compensation accuracy. Also introduced varactor screening method and error analysis.