低功耗智能便携式温度测量仪的研究翻译

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1、Anultra-low-powerCMOStemperaturesensorforRFIDapplicationsAbstract:Anultra-low-powerCMOStemperaturesensorwithanalog-to-digitalreadoutcircuitryforRFIDapplicationswasimplementedina0.18mCMOSprocess.Toachieveultra-lowpowerconsumption,anerrormodelisproposedandthecorrespondingnoveltemperaturesensorf

2、ront-endwithanewdouble-measuremethodispresented.Analog-to-digitalconversionisaccomplishedbyasigma-deltaconverter.Thecompletesystemconsumesonly26A@1.8Vforcontinuousoperationandachievesanaccuracyof±0.65◦Cfrom–20to120◦Caftercalibrationatonetemperature.Keywords:CMOStemperaturesensor;erroranalysis

3、;digitaloutput;lowpower;RFIDDOI:10.1088/1674-4926/30/4/EEACC:1205;1065H1.IntroductionRFIDtechnologyhasattractedprofoundattention.Notcontentwithobjectidentificationonly,peopleareseekingformorefunctionsprovidedbyRFIDsystems.Oneofthemostattractiveapplicationsistorealizereal-timetemperaturesensin

4、gbyintegratingatemperaturesensorintotheRFIDtag.However,thereexistsomechallengingfeaturesforthesensor.First,thetemperaturesensormustbeon-chipandeasytocalibratetominimizethecost.Second,thepowerconsumptionofthesensorisstringentlylimited.Third,thetemperaturesensorshouldachievehighaccuracyinthewho

5、letemperaturesensingrange.Severalpapershavereportedtemperaturesensordesigns.However,thesecaneithernotberealizedinlow-costCMOStechnologyortheyconsumetoomuchpowerforcontinuousoperation.Inthispaper,anoveldesignofaCMOStemperaturesensor,whichofferslowpower,lowcostandhighaccuracy,isproposed.Anerror

6、modelforthissensorisdeveloped.Also,thearchitecturalimprovementsofthetemperaturesensor,whichincludesasensorfrontendandasigma-deltaADC,isgiven.2.ErrormodelThemostimportantcandidateforaCMOStemperaturesensoristhebipolartransistor,whichcanberealizedasaparasiticdeviceinstandardCMOStechnology.Almost

7、allCMOStemperaturesensorsfollowtheprincipleofthegeneralarchitectureofthebandgapreferenceasillustratedinFig.1.Thedifferenceofthetwobase-emittervoltagesisdirectproportionaltotheabsolutetemperature(PTAT),asgivenbyTherefore,thetemperaturecanbemea