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1、IEEEJOURNALOFSOLID-STATECIRCUITS,VOL.SC-19,NO.6,DECEMBER1984971ANewFahrenheitTemperatureSensorROBERTA.PEASEAbstract—Anewmonolithicintegratedcircuitprovidesanoutputvolt-popularizedwiththeintroductionin1978oftheLM135,agesealedproportionaltotheFahrenheittemperaturewithoutthenec
2、essitywhichhasthecharacteristicsofatwo-terminal(tempera-fortheusertosubtractalargeconstantoffset(aswithmostKelvin-scaledture-sensitive)Zenerdiode[4](seeFig.1).Butaspecifictemperaturesensors).Anadvantageofthiscircuitisthatthegainisinherentlycalibrated(e.g.,to+10.00mV/°F)bysim
3、plytrimmingthedrawbackofanyKelvinthermometeristhewaythatitsoffseterroratroomtemperature.Thisbehaviorisshowntobeapredict-outputconsistsofalargeconstantvoltage(e.g.,2.732Vatablefunctionoftheinherentbandgapvoltageofsilicon,+1.220V.O°C)plusarelativelysmalltemperaturecoefficient(
4、e.g.,10Thecircuithasbeendesignedtopermittrimmingofaccuracy(gainandmV/°C).Soiftheoutputvoltagechangesfrom2.98tooffset)byblowingmetaflinksandbythefamiliarZener-zaptechnique.The2.99V,wecannotbesurewhetherthetemperaturerosesensorachievesatypicalaccuracyof*0.5°Fatroomtemperature,
5、and+1.O”Foveraratedtemperaturerangefrom–50”Fto+300”F,without1‘C,oriftherewasashiftintheoffsetorgainstability.anyrequirementforlasertrimming.ThepracticallimitationonaccuracyisEvenifwetrustthegainstabilityofthesensor,anordinarytheproductiontestingofdevicesunderconditionsofprec
6、iselyknownCelsiusthermometerfunctionrequiresustosubtract2.732temperature.ApplicationscircuitsarealsopresentedtoshowwherethisVfromtheoutputofatypicalthermometercircuit,withannewsensorhasadvantagesinaccuracyandconvenienceoverpresentsensors.offsetstabilitybetterthan0.3percent,o
7、relse1‘Coferrorwillresult.Analogcircuitengineerswillrecognizethatthisisanontrivialstabilitytoattain,especiallyatlowcost.I.BACKGROUNDHEvoltageofaforward-biasedsemiconductorjunc-II.CIRCUITAPPROACHESANDPRINCIPLESTtiondiodeV~haslongbeenknowntobeastableandfairlylineartemperatures
8、ensor[1].However,thewideToavoidtheneedfortheusertosubtractthislargeproducti
