标签: 增益放大器

基于单片机的可控增益放大器设计.pdf

Althoughitissimpletomeasuretemperatureinastand-alonesystemwithoutthehelpofMicrochip’sPro-grammableGainAmplifiers(PGA),avarietyofprob-lemscanbeeliminatedbyimplementingtemperature-sensingcapabilityinmultiplexedapplicationswithaPGA.Oneofthemainadvantagesisthatyoucanelim-inateasecondsignalpathtothemicrocontrollerandstillmaintaintheaccuracyofyoursensingsystem.Inparticular,themultiplexedPGAsyoucanusearetheMCP6S22(two-channel),MCP6S26(six-channel),andMCP6S28(eight-channel).Themostcommonsensorsfortemperaturemeasure-mentsaretheThermistor,SiliconTemperatureSensor,RTDandThermocouple.Microchip’sPGAsarebestsuitedtointerfacetotheThermistororSiliconTemperatureSensor.Inthisapplicationnotewewilldiscusstheimplementa-tionoftemperaturemeasurementsystemsfromsensortothePICmicro®microcontrollerusingaNTCTher-mistor,SiliconTemperaturesensor,PGA,anti-aliasingfilter,A/Dconverterandmicrocontroller.MAN867TemperatureSensingWithAProgrammableGainAmplifierAuthor:BonnieC.BakerMicrochipTechnologyInc.10000000NTCThermistorResistance()10k@25Cthermistor1000000INTRODUCTION100000Althoughitissimpletomeasuretempera……