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1 Output stages and power amplifiers Characteristics of npn BJT Low output resistance Efficient power delivery
2 Figure 14.1 Collector current waveforms for transistors operating in (a) class A, (b) class B, and (c) class AB amplifier stages. Classification of Output Stages sinusoidal input signal
3 Figure 14.2 An emitter follower (Q 1 ) biased with a constant current I supplied by transistor Q 2. Class A Output Stage transfer characteristic
4 Figure 14.4 Maximum signal waveforms in the class A output stage of Fig. 14.2 under the condition I = V CC /R L or, equivalently, R L = V CC /I. Signal Waveforms
5 Power-Conversion Efficiency
6 Figure 14.5 A class B output stage. Class B Output Stage transfer characteristic
7 Power-Conversion Efficiency
8 Figure 14.8 Power dissipation of the class B output stage versus amplitude of the output sinusoid. Power Dissipation
9 Figure 14.7 Illustrating how the dead band in the class B transfer characteristic results in crossover distortion. Crossover Distortion
Output Stages and Power Amplifiers
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APPENDIX B SPICE DEVICE MODELS AND DESIGN SIMULATION EXAMPLES USING PSPICE AND MULTISIM Microelectronic Circuits, Sixth Edition Sedra/Smith.
Class A Output Stage - Recap Class A output stage is a simple linear current amplifier. It is also very inefficient, typical maximum efficiency between.
Class A Output Stage - Recap
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Class B Output. Biasing the Class B Output * No DC current is used to bias this configuration. *Activated when the input voltage is greater than the Vbe.
Module 2: Part 2 Basic BJT Amplifiers. Learning Objectives After studying this module, the reader should have the ability to: n Explain graphically the.
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© 2000 Prentice Hall Inc. Figure 7.1 The current mirror.
Chapter #11: Output Stages and Power Amplifiers
Output Stages And Power Amplifiers
1 Figure Class AB output stage. A bias voltage V BB is applied between the bases of Q N and Q P, giving rise to a bias current I Q given by Eq. (14.23).
McGraw-Hill © 2008 The McGraw-Hill Companies Inc. All rights reserved. Electronics Principles & Applications Seventh Edition Chapter 8 Large-Signal Amplifiers.
Power Amplifiers Power Amplifiers are used in the transmitter
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