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Amplifier Circuits

Amplifier Circuits

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We have examined a variety of amplifier circuits that have one to three transistors. More complicated 'building blocks' will be introduced later. As additional transistors are added, complexity grows to the point that a multilevel or hierarchical organization is needed. Multiple circuits are combined to form complete subsystems, which in turn are combined with other subsystems to form the final system. We can manage complexity at these various levels in the same way. An op-amp contains many circuits but, like the transistor, can be modeled as a single device with a simple functional description. In this chapter, we developed a 'library' of basic circuits that can be used to develop a library of basic subsystems, in the same way that commonly used computer routines can be joined to form more complicated routines.

Chapter Contents:

  • Bipolar Junction Transistor T Model
  • The β Transform
  • Two-Port Networks
  • Amplifier Configurations
  • The Transresistance Method
  • Input and Output Resistances
  • The Cascade Amplifier
  • BJT Output Resistance
  • The Cascode Amplifier
  • The Effect of Base-Emitter Shunt Resistance
  • The Darlington Amplifier
  • The Differential (Emitter-Coupled) Amplifier
  • Current Mirrors
  • Matched Transistor Buffers and Complementary Combinations
  • Closure

Inspec keywords: operational amplifiers

Other keywords: amplifier circuits; op-amp; basic subsystems; complete subsystems; basic circuits; multilevel organization; hierarchical organization

Subjects: Amplifiers

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