摘要
该文设计了一种基于单片机的温度补偿晶体振荡器系统,它具有可视化、高精度和温度补偿模式可调的特点。在-6.9^+72℃宽温度范围内,单片机分别从测温电路、高精度频率计读取晶振的实时温度和频率,并与内存的电压-温度曲线比较,产生相应的控制电压来精确补偿晶体振荡器的频率偏移;在此温度范围外,通过键盘输入信号控制半导体制冷制热器,调节系统内部温度至此温度范围内完成补偿。测试结果表明,通过该温补系统,在-6.9^+72℃宽温度范围内,其频率-温度稳定度由补偿前的±6.25×10-6变为±1.875×10-6,性能提升了70%。
A temperature-compensated crystal oscillator system based on MCU is designed in this paper.It has the features of visualization,high accuracy and temperature-compensated mode adjustable.The MCU reads the realtime temperature and frequency data through temperature measurement circuit and frequency meter respectively at the wide temperature range of-6.9℃and＋72℃,and compares with the stored voltage-temperature curve,then generates control signal to compensate frequency shift of the oscillator.While the temperature is outside this range,the keyboard inputs refrigerating/heating signal according to the semiconductor refrigerating and heating circuit and adjusts the internal temperature to the proper range.The test result shows that the frequency-temperature stability is increased to±1.875×10^-6 from ±6.25×10^-6 before compensating a the temperature range of-6.9~＋72℃,which is promoted by 70%.
出处
《压电与声光》
CAS
CSCD
北大核心
2016年第3期492-496,共5页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(41274047)
广东省科技计划基金资助项目(2013B090500049)
江苏省自然科学基金资助项目(BK2012639)
关键词
晶体振荡器
温度补偿
单片机
压控
频率-温度稳定度
高精度
crystal oscillator
temperature compensation
MCU
voltage-controlled
frequency-temperature sta bility
high accuracy
