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当要求模拟温补晶体振荡器(TCXO)在宽温范围内频率温度稳定性优于±1×10-6时,使用传统补偿方法通常一次成功率低.通过对温补精度影响因素的分析,得出温补网络中热敏电阻测试方法和计算模型误差较大.因此,提出一种改进的宽温补偿方法.首先,参考热敏电阻在宽温范围内在线测试,获得实际数据;然后,待使用热敏电阻依据参考热敏电阻测试数据进行比例建模,得到各温度对应电阻值;最后,将建模后的待使用热敏电阻代入温补网络计算程序,采用遗传算法优化计算网络参数.通过与传统方法的对比试验,表明该方法建模的热敏电阻与实际测试值更接近,温补网络计算程序更灵活,温补一次成功率提高到约90%以上.
When the TCXO is required to have a frequency-temperature stability better than ± 1 × 10-6 over a wide temperature range, the traditional method of compensation usually has a low success rate.Through the analysis of the influencing factors of the temperature compensation accuracy, It is concluded that there is a large error in the test method and calculation model of the thermistor in the thermocline network.Therefore, an improved method of wide temperature compensation is proposed.Firstly, real-time data are obtained by in-line testing of the thermistor over a wide temperature range, Thermistor to be used according to the reference thermistor test data proportional modeling, the temperature corresponding resistance value; Finally, the model to be used thermistor into the temperature compensation network calculation program, the use of genetic algorithms to optimize the calculation of network parameters Compared with the traditional method, it shows that the thermistor modeled by this method is closer to the actual test value, the temperature compensation network calculation program is more flexible, the success rate of warming - up is improved to over 90%.