低功耗智能便携式温度测量仪研究分析翻译

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

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

3、ensor;erroranalysis;digitaloutput;lowpower;RFIDDOI:10.1088/1674-4926/30/4/045003EEACC:1205;1065H1.IntroductionRFIDtechnologyhasattractedprofoundattention.Notcontentwithobjectidentificationonly,peopleareseekingformorefunctionsprovidedbyRFIDsystems.Oneofthemostattractiveapplicationsistor

4、ealizereal-timetemperaturesensingbyintegratingatemperaturesensorintotheRFIDtag.However,thereexistsomechallengingfeaturesforthesensor.First,thetemperaturesensormustbeon-chipandeasytocalibratetominimizethecost.Second,thepowerconsumptionofthesensorisstringentlylimited.Third,thetemperature

5、sensorshouldachievehighaccuracyinthewholetemperaturesensingrange.Severalpapershavereportedtemperaturesensordesigns.However,thesecaneithernotberealizedinlow-costCMOStechnologyortheyconsumetoomuchpowerforcontinuousoperation.Inthispaper,anoveldesignofaCMOStemperaturesensor,whichofferslowp

6、ower,lowcostandhighaccuracy,isproposed.Anerrormodelforthissensorisdeveloped.Also,thearchitecturalimprovementsofthetemperaturesensor,whichincludesasensorfrontendandasigma-deltaADC,isgiven.2.ErrormodelThemostimportantcandidateforaCMOStemperaturesensoristhebipolartransistor,whichcanbereal

7、izedasaparasiticdeviceinstandardCMOStechnology.AlmostallCMOStemperaturesensorsfollowtheprincipleofthegeneralarchitectureofthebandgapreferenceasillustratedinFig.1.....页脚...页眉Thedifferenceofthetwobase-emittervoltagesisdirectproportionaltotheabsolutetemperature(PTAT),asgivenbyTherefore,