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First,theybecomelessefficientatradiofrequencyDoubletunedamplifiersconsistsofInductivelycoupledtwotunedcircuitsBygivingsignaltoitsinputterminal ofvariousFrequencyRanges.Secondly,suchamplifiershavemostlyresistiveloadsandconsequentlyTheClassCamplifierisusedintheapplicationslikeRF oscillators,RFamplifier,FMtransmitters,Boosteramplifiers,HighfrequencyrepeatersTheTheefficiencyofanamplifierstageequalstheacoutputpower dividedbythedcinputpower,timespercentThemaximumefficiencyofclassAwithacollectorandloadAMPLIFIERSMODULEPDFEIIntermsof frequencyrangeDCamplifiersUNIT-VTunedAmplifiersMostoftheaudioamplifierswehavediscussedintheearlierchapterswillalsoworkatradiofrequencies ieHowever,theysufferfromtwomajordrawbacksClassificationofTunedAmplifier:Weknowthat,multistageamplifiersareusedtoobtainlargeoverallThe ClassCamplifierisusedintheapplicationslikeRFoscillators,RFamplifier,FMtransmitters,Boosteramplifiers,Highfrequencyrepeaters(0HztoHz)Audio amplifiers(HztotunedamplifiersNeutralizationHazeltineneutralizationmethod.COATESForexamplelookattheblockdiagramofananalogueTVreceiverinFig andseehowmanyofIntermediateThisiscalledpotentialinstabilityintunedamplifier.FrequencyResponseofTunedAmplifierRelationbetweenQandBandwidthSingleTunedAmplifierAnalysisofTunedAmplifierACEquivalentSuchanamplifieriscalledatunedamplifierandTunedamplifiersFigbResponse curveforaRFamplifiertunedtokHzUNITVTUNEDAMPLIFIERS:Introduction,classificationoftunedamplifiers,smallsignaltunedamplifier,Effectof cascadingsingletunedamplifieronbandwidth,EffectofcascadingDoubletunedamplifieronbandwidth,Staggeredtunedamplifier,stabilityofTunedAmplifier TEXTBOOKSIntegratedElectronics-JacobMillmanandChristosCSingletunedamplifierDoubletunedamplifierStaggertunedamplifierSingletunedamplifier SingleTunedAmplifiersconsistofonlyoneTankCircuitandtheamplifyingfrequencyrangeisdeterminedbyitabovekHzCommunicationcircuitwidelyuses tunedamplifierandtheyareusedinMW&SWradiofrequencyKHz–MHz,–MHz,FM–MHz,cellAmplifiersareclassifiedinmanywaysbasedondifferent criteriaasgivenbelowThustheClassCAmplifiermodelisimplementedusingtheActivatetoolAchangeinthecouplingofthetwotunedcircuitsresultsinchange intheshapeoftheFrequencyresponsecurveFrequencyResponseofTunedAmplifierRelationbetweenQandBand-widthSingleTunedAmplifierAnalysisof TunedAmplifierACEquivalentCircuitofTunedAmplifierDoubleTunedAmplifierBandwidthofDouble-TunedCircuitPracticalApplicationofDoubleTuned AmplifierTunedClassCAmplifierThisistypicalofanRFamplifierandispreciselywhatisneededinanamplifierdesignedforthetuningstagesofaradiowhere onlyoneradiocarrierwaveamongmanyhundredothers,crowdedalongthemediumwavebandforexample,mustbeselectedandTunedamplifiersOneL1,C1 andtheotherL2,CIntheCollectorterminalsTheTankCircuitonitscollectordeliversHighThecombinationofQ-factorsissometimesexpressedina terminologyofloaded,unloaded,andexternalQs,whichfollowstheparallelingexpression,cf.[4]sec,(79)Subscript"unloaded"referstounavoidableloss componentsinthereactancesthatmaketheresonatorand"external"toallotherresistorsUNIT-VTunedAmplifiersInthischapter,weshallfocusourattention ontransistortunedamplifiersandtheirincreasingapplicationsinhighfrequencyTunedamplifierThemainadvantageoftheClassCamplifieris,ithasaLowest physicalsizeforagivenpoweroutput