fig. 5.3 transistor circuit under examination in this...

Fig. 5.3 Transistor circuit under examination in this introductory discussion.

Robert L. Boylestad

Electronic Devices and Circuit Theory, 9e

Copyright ©2006 by Pearson Education, Inc.

Upper Saddle River, New Jersey 07458

All rights reserved.

Fig. 5.4 The network of Fig. 5.3 following removal of the dc supply and insertion of the short-circuit equivalent for the capacitors.

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Fig. 5.5 Circuit of Fig. 5.4 redrawn for small-signal ac analysis.

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Fig. 5.6 (a) Common-base BJT transistor; (b) re model for the configuration of (a).

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Fig. 5.7 Common-base re equivalent circuit.

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Fig. 5.8 Defining Zo.

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Fig. 5.9 Defining Av = Vo/Vi for the common-base configuration.

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Fig. 5.10 Approximate model for a common-base npn transistor configuration.

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Fig. 5.11 (a) Common-emitter BJT transistor; (b) approximate model for the configuration of (a).

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Fig. 5.12 Determining Zi using the approximate model.

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Fig. 5.13 Effect of re on input impedance.

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Fig. 5.14 Defining ro for the common-emitter configuration.

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Fig. 5.15 Including ro in the transistor equivalent circuit.

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Fig. 5.16 Determining the voltage and current gain for the common-emitter transistor amplifier.

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Fig. 5.17 re model for the common-emitter transistor configuration.

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Fig. 5.19 Two-port system.

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Fig. 5.20 Hybrid input equivalent circuit.

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Fig. 5.21 Hybrid output equivalent circuit.

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Fig. 5.22 Complete hybrid equivalent circuit.

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Fig. 5.23 Common-emitter configuration: (a) graphical symbol; (b) hybrid equivalent circuit.

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Fig. 5.24 Common-base configuration: (a) graphical symbol; (b) hybrid equivalent circuit.

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Fig. 5.25 Effect of removing hre and hoe from the hybird equivalent circuit.

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Fig. 5.26 Approximate hybrid equivalent model.

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Fig. 5.27 Hybrid versus re model: (a) common-emitter configuration; (b) common-base configuration.

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Fig. 5.28 Common-emitter hybrid equivalent circuit for the parameters of Example 5.3.

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Fig. 5.29 Common-base re model for the parameters of Example 5.3.

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Fig. 5.30 Giacoletto (or hybrid ) high-frequency transistor small-signal ac equivalent circuit.

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Fig. 5.34 Common-emitter fixed-bias configuration.

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Fig. 5.35 Network of Fig. 5.34 following the removal of the effects of VCC, C1 and C2.

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Fig. 5.36 Substituting the re model into the network of Fig. 5.35.

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Fig. 5.37 Determining Zo for the network of Fig. 5.36.

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Fig. 5.38 Demonstrating the 180° phase shift between input and output waveforms.

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Fig. 5.39 Example 5.4.

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Fig. 5.40 Voltage-divider bias configuration.

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Fig. 5.41 Substituting the re equivalent circuit into the ac equivalent network of Fig. 5.40.

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Fig. 5.43 CE emitter-bias configuration.

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Fig. 5.45 Defining the input impedance of a transistor with an un-bypassed emitter resistor.

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Fig. 5.49 The ac equivalent circuit of Fig. 5.48.

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Fig. 5.50 An emitter-bias configuration with a portion of the emitter-bias resistance bypassed in the ac domain.

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Fig. 5.51 Emitter-follower configuration.

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Fig. 5.53 Defining the output impedance for the emitter-follower configuration.

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Fig. 5.55 Emitter-follower configuration with a voltage-divider biasing arrangement.

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Fig. 5.56 Emitter-follower configuration with a collector resistor RC.

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Fig. 5.57 Common-base configuration.

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Fig. 5.60 Collector feedback configuration.

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Fig. 5.62 Defining Zo for the collector feedback configuration.

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Fig. 5.64 Collector feedback configuration with an emitter resistor RE.

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Fig. 5.65 Collector dc feedback configuration.

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Fig. 5.69 Determining the current gain using the voltage gain.

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Fig. 5.70 Amplifier configurations: (a) unloaded; (b) loaded; (c) loaded with a source resistance.

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Fig. 5.71 The ac equivalent network for the network of Fig. 5.70c.

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Fig. 5.72 Voltage-divider bias configuration with Rs and RL.

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Fig. 5.74 Emitter-follower configuration with Rs and RL.

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Fig. 5.75 Substituting the re equivalent circuit into the ac equivalent network of Fig. 5.74

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Fig. 5.77 Substituting the internal elements for the two-port system of Fig. 5.76.

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Fig. 5.79 Applying a load to the two-port system of Fig. 5.77.

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Fig. 5.80 Including the effects of the source resistance Rs.

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Fig. 5.81 Considering the effects of Rs and RL on the gain of an amplifier.

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Fig. 5.82 Amplifier for Example 5.16.

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Fig. 5.110 Approximate common-emitter hybrid equivalent circuit.

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Fig. 5.111 Approximate common-base hybrid equivalent circuit.

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Fig. 5.112 Fixed-bias configuration.

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Fig. 5.113 Substituting the approximate hybrid equivalent circuit into the ac equivalent network of Fig. 5.112.

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Fig. 5.115 Voltage-divider bias configuration.

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Fig. 5.116 CE unbypassed emitter-bias configuration.

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Fig. 5.117 Emitter-follower configuration.

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Fig. 5.118 Defining Zo for the emitter-follower configuration.

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Fig. 5.119 Common-base configuration.

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Fig. 5.120 Substituting the approximate hybrid equivalent circuit into the ac equivalent network of Fig. 5.119.

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Fig. 5.123 Substituting the complete hybrid equivalent circuit into the two-port system of Fig. 5.122.

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Fig. 5.125 Substituting the complete hybrid equivalent circuit into the ac equivalent network of Fig. 5.124.

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Fig. 5.126 Replacing the input section of Fig. 5.125 with a Thévenin equivalent circuit.

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Fig. 5.128 Small-signal equivalent for the network of Fig. 5.127.

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fig. 5.3 transistor circuit under examination in this...

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