改进型恒温晶振三次方补偿电路的研究与设计  

Design of cubic compensation circuit for constant temperature crystal oscillator

作　　者：谭传武[1] 刘红梅[1] Tan Chuanwu;Liu Hongmei(Department of Communication and Signal,Hunan Railway Professional Technology College,Zhuzhou 412001,China)

机构地区：[1]湖南铁道职业技术学院电务技术学院,湖南株洲412001

出　　处：《电子技术应用》2020年第9期51-56,共6页Application of Electronic Technique

基　　金：湖南省自然科学基金(2020JJ7052);湖南省教育厅科学研究项目(19B380);湖南铁道职业技术学院青年科研骨干培养项目。

摘　　要：通信系统中收发同步离不开精确的时钟频率源,时钟频率源的精确与否直接影响系统的可靠性,而AT切晶体是频率源的重要组成部分,其频率与温度呈现三次函数的变化关系,导致其不适应较宽温度范围的应用场景。为克服温度对频率的直接影响,设计了一种用于温度补偿的三次函数发生电路,包括基准源、一次方电压产生电路、三次方产生电路及相加电路,在工作时能与AT切晶体产生的负温度系数相抵消。仿真结果表明,基准源电路恒定输出1.8 V,三次方电路输出波峰1.65 V、波谷0.85 V,加和后经调整的补偿电路产生波形波峰2.04 V、波谷1.74 V,很好地抑制了来自温度变化引起的频率误差,解决了振荡器输出频率随温度变化的问题。In the communication system,the receiving and transmitting synchronization can not be separated from the accurate clock frequency source.The accuracy of the clock frequency source directly affects the reliability of the system.AT cut crystal is an important part of the frequency source.Its frequency and temperature show a cubic function relationship,which makes it not suitable for a wide range of temperature application scenarios.In order to overcome the direct influence of temperature on frequency,this paper designs a kind of cubic function generating circuit for temperature compensation,including reference source,primary voltage generating circuit,cubic generating circuit and adding circuit,which can cancel the negative temperature coefficient produced by AT cut crystal in operation.The simulation results show that the reference circuit has a constant output of 1.856 V,the third-order circuit has a peak of 1.65 V and a trough of 0.85 V,and the added compensation circuit has a peak of 2.04 V and a trough of 1.74 V.The frequency error caused by the temperature change is well suppressed,and the problem that the output frequency of the oscillator changes with the temperature is solved.

关 键 词：温度补偿 压控振荡器 三次方函数 带隙基准 频率源 

分 类 号：TN433[电子电信—微电子学与固体电子学]