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Chapter Eight 8-1 Output Stages and Power Amplifiers McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.1 8-2 Typical dc beta characteristics (hFE versus lc) for 2N3055 McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.3 8-3 The safe operating area of a bipolar transistor plotted on: (a) linear scales and (b) logarithmic scales McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.7 8-4 Typical characteristics for high-power MOSFETs: (a) transconductance versus drain current; (b) transfer characteristics McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.8 8-5 (a) Cross section of a VMOS device; (b) cross section of DMOS device; (c) HEXFET structure McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.15 8-6 Collector current versus time characteristics: (a) class-A amplifier, (b) class-B amplifier, (c) class-AB amplifier, and (d) class-C amplifier McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.16 8-7 (a) Common-emitter amplifier, (b) dc load line, and (c) instantaneous power dissipation versus time in the transistor McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.20 8-8 Crossover distortion of basic complementary push-pull output stage McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.23 Bipolar class-AB output stage McGraw-Hill 8-9 Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.24 Characteristics of a class-AB output stage: (a) voltage transfer curve, (b) sinusoidal input signal, (c) collector currents, and (d) output current McGraw-Hill 8-10 Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.28 8-11 (a) Transformer-coupled common-emitter amplifier and (b) dc and ac load lines McGraw-Hill Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.30 Class-AB output stage with quiescent bias established by diodes McGraw-Hill 8-12 Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved. Figure 8.31 Class-AB output stage with VBE multiplier bias circuit McGraw-Hill 8-13 Copyright © 2001 by the McGraw-Hill Companies, Inc. All rights reserved.