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chap14 - Fig 14.17 Electrical equivalent circuit of the...

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Chapter 14 Output Stages and Power Amplifiers
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Fig. 14.1 Collector current waveforms for transistors operating in (a) class A , (b) class B amplifier stages
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Fig. 14.1 (continued) : (c) class AB and (d) class C amplifier stages
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Fig. 14.2 An emitter follower (Q 1 ) biased with a constant current I provided by Q 2
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Fig. 14.3 Transfer characteristic of the emitter follower in Fig. 14.2 .
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Fig. 14.5 A class B output stage
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Unformatted text preview: Fig. 14.17 Electrical equivalent circuit of the thermal conduction process . Fig. 14.20 Electrical analog of the thermal conduction process when a heat sink is utilized . Fig. 14.18 A power – derating curve : maximum allowable power dissipation vs ambient temperature for a BJT operated in air . Fig. 14.21 Maximum allowable power dissipation vs. transistor-case temperature Fig. 14.22 Thermal equivalent circuit for Example 14.5 . Fig. 14.10 Class AB output stage . Fig. 14.9 Class B circuit with an op amp connected in a negative feedback to reduce crossover distortion . Fig. 14.13 Determining the small signal output resistance of the class AB circuit of Fig. 14.11 . Fig. 14.4 A class AB output stage utilizing diodes for biasing . Fig. 14.16 A discrete- circuit class AB output stage with a potentiometer...
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