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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.
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