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Module 2: Part 2 Basic BJT Amplifiers

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Learning Objectives After studying this module, the reader should have the ability to: n Explain graphically the amplification process in a simple bipolar amplifier circuit. n Describe the small-signal hybrid-p equivalent circuit of a bipolar transistor and to determine the values of the small-signal hybrid-p parameters. n Apply the small-signal hybrid-p equivalent circuit to various bipolar amplifier circuits to obtain the time-varying circuit characteristics. n Characterize the small-signal voltage and current gains and the input and output resistances of a common-emitter amplifier. n Characterize the small-signal voltage and current gains and the input and output resistances of an emitter-follower amplifier. n Characterize the small-signal voltage and current gains and the input and output resistances of a common-base amplifier. n Apply the bipolar small-signal equivalent circuit in the analysis of multistage amplifier circuits.

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(a) Bipolar transistor inverter circuit; (b) inverter transfer characteristics

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Common-emitter transistor characteristics, dc load line, and sinusoidal variation in base current, collector current, and collector-emitter voltage

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Base current versus base-emitter voltage characteristic with superimposed sinusoidal signals

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A simplified small-signal hybrid- equivalent circuit for the npn transistor

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Expanded small-signal model of the BJT, including the Early effect, for the case when the circuit contains the (a) transconductance and (b) the current gain parameters

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Basic data sheet for the 2N2222 bipolar transistor

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A bipolar circuit with an emitter resistor, a voltage-divider biasing circuit, and a coupling capacitor

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The small-signal equivalent circuit with an emitter resistor

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Emitter-follower circuit

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Small-signal equivalent circuit of the emitter-follower

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Basic common-base circuit

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(a) Simplified hybrid- model of the npn transistor and (b) small-signal equivalent circuit of the common-base circuit

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