3 Topics Covered in Chapter 30 Circuit ConfigurationsClass A, B, or C OperationAnalysis of Common-Emitter (CE) AmplifierCollector Characteristic CurvesLetter Symbols for Transistors
4 Topics Covered in Chapter 30 (continued)FET AmplifiersTypes of DistortionNegative FeedbackTroubleshooting Amplifier Circuits
5 Types of Amplifiers for Junction Transistors Common-Emitter (CE)phase inversionvoltage, current, and power gainCommon-Collector (CC)no phase inversionno voltage gain, but has current and power gainCommon-Base (CB)no current gain, but has voltage and power gain
14 Collector Family of Characteristic Curves 24681012141618VCE in VoltsIC in mA20 mA0 mA100 mA80 mA60 mA40 mA
15 Gain of Junction Transistors Beta (b)Defined as the ratio IC/IBDetermines the current gain of CE amplifiersTypical values are 10 to 300Alpha (a)Defined as the ratio IC/IEValues less than 1, typically 0.98 or 0.99
16 Transistor Gain 10 mA IC 100 mA IB 10.1 mA IE 100 10 = A mA I m b 99 . 110=mAIECa10.1 mAIE
17 Types of FET Amplifiers Common-SourceCorresponds to a CE circuit for a junction transistor: signal inversion, voltage gain and power gain.Common-DrainCorresponds to a CC circuit for a junction transistor: no signal inversion, no voltage gain, has power gain.Common-GateCorresponds to a CB circuit for a junction transistor: no signal inversion, voltage gain and power gain.