高稳定度晶体振荡器频率温度特性改善的分析

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1、木文在分析传统的数字、模拟温度补偿晶振及恒温晶振技术的基础上，针对不同指标要求的晶体振荡器设计了四种改善频率温度特性的方案。本文设计了微机补偿晶体振荡器，采用自测温传感器、及微处理器的软件技术实时获取A/D转换数据，其频率温度稳定度提高了一个量级；还设计了基于双金属电极的热应力补偿温补晶振，从晶体自身特性岀发，结合其力■频特性与温■频特性使晶振频率温度稳定度得到改善；同时，设计了GPS驯服晶体振荡器，用高精度GPS信号锁定晶体振荡器，消除了晶振的频漂且锁定后精度大幅度提高；最后，关于恒温晶振的频率温度特性，通过改进振荡电路、温控

2、电路设计，采用双层恒温控制晶振，使得频率温度稳定度得到很大的提高。实验结果表明，应力补偿温补晶振的频率温度特性曲线有明显的改善；微机补偿晶振的频率温度稳定度小于±0.05ppm；经GPS驯服后，晶振24小时内平均频率准确度优于1.0e-12,频率温度稳定度在0.09ppb以内；恒温晶振的频率稳定度在0.2ppb以内。四种改善晶体振荡器频率温度特性的方案，不同程度的提高了晶振的频率温度稳定度。尖键词：频率温度特性应力补偿晶振微机补偿晶振GPS驯服晶振恒温晶振AbstractInthispaper,fourtypesofscheme

3、simprovedfrequencytemperaturecharacteristicaredesigned,basedondifferentindicatorsandtheanalysisofconventionalDigital,AnalogTemperatureCompensatedCrystalOscillator(TCXO)orOvenControlCrystalOscillator(OCXO).MicrocomputerCompensatedCrystalOscillator(MCXO)throughusingsel

4、f-temperaturesensorandmicroprocessorsoftwaretechnologytoobtainreal-timeA/Dconversiondataimprovedstronglythestabilityoffrequency-temperature.Fromcrystalcharacteristics,thethermalforcecompensatedcrystaloscillatorbasedonbimetallicelectrodes,combiningitsforcefrequencywi

5、thtemperature-frequencycharacteristicsandimprovingfrequencytemperaturestability.GPSholdovercrystaloscillatornotonlyeliminatecrystaloscillatorfrequencydriftbutenhancelargelyfrequency-temperaturestability,byGPSsignallockcrystaloscillator.OCXOusedoublethermostaticcontro

6、lcrystal,throughimprovingoscillatorcircuitandtemperaturecontrolcircuit,itsfrequency-temperaturecharacteristicisimprovedlargely.Experimentalresultsshowthatfrequency-temperaturecharacteristicofforcecompensatedcrystaloscillatorisimprovedobviously,frequencytemperaturesta

7、bilityofMCXOislessthan土0.05ppm;within24hours,theaveragefrequencyaccuracyofGPStamecrystaloscillatorislessthan1.0e-12,anditsfrequencytemperaturestabilityislessthan0.09ppb;OCXOfrequencytemperaturestabilityislessthan0.2ppb.Thefourtypesofschemeofimprovingcrystaloscillator

8、frequency-temperaturecharacteristicsenhancedifferentlylevelfrequencytemperaturestability.Keywords:Frequency-temperaturecharacterist