标签: 精密单电源

INTRODUCTIONPhotodiodesbridgethegapbetweenlightandelectronics.Manytimes,precisionapplications(suchasCTscanners,bloodanalyzers,smokedetectors,positionsensors,IRpyrometersandchromatographs)utilizethebasictransimpedanceamplifiercircuitthattransformslightenergyintoausableelectricalvoltage.Inthesecircuits,photodiodesareusedtocapturethelightenergyandtransformitintoasmallcurrent.Thiscurrentisproportionaltothelevelofilluminationfromthelightsource.Apreamplifierthenconvertsthecurrent(inamperes)fromthephotodiodesensorintoausablevoltagelevel.MAN692UsingaDigitalPotentiometertoOptimizeaPrecisionSingle-SupplyPhotoDetectionCircuitPhotodiodeCharacteristicsAuthor:BonnieC.BakerMicrochipTechnologyInc.AphotodiodecanbeoperatedinthePhotovoltaicorPhotoconductivemode,asshowninFigure2.INTRODUCTIONLightSourcePhotodiodesbridgethegapbetweenlightandLighte……