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时间:2020-03-25
《电容式微机械陀螺双环路闭环驱动电路研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第23卷第10期传感技术学报Vol_23No.102010年lO月CHINESEJOURNALOFSENSORSANDACTUATORS0ct.20l0TheResearchontheDualClosed-LoopDrivingCircuitsforMicro-MachinedGyroscopeⅣXiaoyun,LEILonggang,WANGGuanshi(MEMSCenter,HarbinInstituteofTechnology,Harbin150001,China)Abstract:Inordertoimprovementthedetectionsensit
2、ivityformicro—machinedgyroscope,Studyingonthedrivingcircuitsofthemicro.machinedgyroscopethedualclosed-loopdrivingschemeformicro—machinedgyroscopeispro—posed,basedontheanalysisofthephasetheoryandamplitudetheory,andtheschemeisverifiedbyusingSimu—linkmode1.Therelatedcircuitshavealsobeenim
3、plemented.ConsideringthecharacteristicsofPhase-LockedLoop(PLL),PLLisappliedtoadjustthefrequencyofdrivingsignalinaccordancewiththeresonantfrequencyinthedrivingmode;theamplitudecontrolincludespeakdetector,DCcomparatorandVariableGainAmplifier(VGA)toachievetheconstantamplitude.Thesimulatio
4、nresultsshowthat,settingtimeofstableoscillationisat45msandthestableoscillationfrequencyis2.7553kHz.Thefrequencydifferencebetweendrivingfrequencyandresonantfrequencyisonly0.1Hz.Frequencyjitteris0.056563Hz.Comparedwiththetraditionalclosed—loopdrivingcir—cuits,settingtimeofthedualclosed—l
5、oopdrivingcircuitsshorten30.77%.Thefrequencyjitteris32.72%oftheAGCclosed—loopdrivingcircuitsformicro—machinedgyroscope,thedualclosed—loopdrivingcircuitsformicro—ma—chinedgyroscopeimprovedthequalityofthedrivingsigna1.Soitissignificativefortheimprovementofthedetec—tionsensitivityformicro
6、—machinedgyroscope.Keywords:dualclosed—loopdriving;micro—machinedgyroscope;PLL;VGA;simulinkEEACC:7630:1250doi:10.3969/j.issn.1004—1699.2010.10.018电容式微机械陀螺双环路闭环驱动电路研究谭晓昀,雷龙刚,王冠石(哈尔滨工业大学MEMS中心,哈尔滨150001)摘要:为了提高微机械陀螺系统的检测灵敏度,对微机械陀螺系统的驱动电路进行了研究。分析了微陀螺闭环驱动系统理论,基于此提出一种双环路闭环驱动方法,并且利用数学工具simul
7、ink建立系统模型,验证此方法的可行性,最后设计完成相应电路。此方法引入锁相环实现闭环驱动电路的稳频控制;采用自动增益控制器(AGC)实现恒幅控制。利用Hspice完成电路级仿真。结果表明,微机械陀螺双环路闭环驱动电路建立稳定振荡的时间为45Ins,稳定振荡频率为2.7553KHz,频率偏差为0.1Z,频率抖动为0.056563Hz。相对于传统的AGC闭环驱动电路,此闭环驱动电路建立稳定振荡时间缩短了30.77%,频率稳定性是传统AGC闭环驱动电路的32.72%。微机械陀螺环路闭环驱动电路提高驱动信号性能,对于微机械陀螺检测灵敏度的提高有着重要意义。关键词:双环
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