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目前很多单位又开始设计新的通讯机,根据国家标准,在400MHz频段的通讯设备,频率稳定度要达到5×10~(-6)。而我国目前生产的小公差晶体,在全工作温度范围内,只能达10×10~(-6),这就面临着一个对现有晶体进行温度补偿的问题。对晶体振荡器的温度补偿是一个很复杂的问题,它涉及到一些理论问题,也涉及到繁琐的试验和大量的计算。本文在理论分析的基础上,提出用计算机对热敏元件进行模拟,用微机对晶体进行分类,用计算机对振荡器进行补偿计算。
At present, many units have started to design new communication machines. According to the national standards, the frequency stability of the communication equipment in the 400MHz band should reach 5 × 10 -6. However, the small tolerance crystal currently produced in our country can only reach 10 × 10 -6 in the whole working temperature range, which is facing a problem of temperature compensation for the existing crystal. Temperature compensation for crystal oscillators is a complex problem that involves a number of theoretical issues as well as cumbersome experimentation and extensive calculations. Based on the theoretical analysis, this paper proposes to use computer to simulate the thermal sensor, to classify the crystal by microcomputer and to compensate the oscillator by computer.