电子线路第二章amplifier.pptx

Chapter 2Basic AmplifiersChapter Tow1. Basic BJT AmplifiersA Amplifier Block diagramThe performance index of Amplifier1. The Input resistance Ri2. The output resistance RoThe performance index of Amplifier3. Gain(1) The Voltage gainThe Source voltage gain(2) The current gainThe source current gainThe performance index of Amplifier The two?port network model of amplifierVoltage amplifier ；(b) Current amplifier ；(c) Transconductance amplifier ；(d) transresistance amplifier?The performance index of Amplifier4. The pass band 5. The maximum output power Pomax and the Efficiencyη 6. Nonlinear distortion factor THD 7. Linear distortionCommon emitter amplifierAC equivalent circuit 1. Au2. Ai IfRBrbe,RLRC3 Ro 4 . Source voltage amplification Aus5. With the REA bipolar circuit with an emitter resistor, a voltage-divider biasing circuit, and a coupling capacitorThe small-signal equivalent circuit with an emitter resistor Ri=RB1‖RB2‖R′i? Ro=RCEmitter-follower circuitSmall-signal equivalent circuit of the emitter-follower1. Au2. Ai3. Ri4. RoBasic common-base circuit(a) Simplified hybrid-? model of the npn transistor and (b) small-signal equivalent circuit of the common-base circuit 1. Au2.Ai3. Ri4. RoCouplingVoltage matchingVoltage matchingMultistage amplifierMultistage amplifierMultistage amplifier