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High-Frequency Impedance Transformations

High-Frequency Impedance Transformations

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Active devices such as transistors or Op-Amps have bandwidth limitations that can result in instability or undesirable dynamic response in feedback circuits. As gain decreases with frequency, feedback-amplifier port-resistance values also change and effectively become reactive. These bandwidth-related reactances can resonate with other circuit elements.

Chapter Contents:

  • Active Device Behavior above Bandwidth
  • BJT High-Frequency Model
  • Impedance Transformations in the High-Frequency Region
  • Reactance Chart Representation of β-Gyrated Circuits
  • Reactance Chart Stability Criteria for Resonances
  • Emitter-Follower Reactance-Plot Stability Analysis
  • Emitter-Follower High-Frequency Equivalent Circuit
  • Emitter-Follower High-Frequency Compensation
  • Emitter-Follower Resonance Analysis from the Base Circuit
  • Emitter-Follower Compensation with a Base Series RC
  • BJT Amplifier with Base Inductance
  • The Effect of rb' on Stability
  • Field-Effect Transistor High-Frequency Analysis
  • Output Impedance of a Feedback Amplifier
  • Closure

Inspec keywords: operational amplifiers; transistor circuits; electric impedance

Other keywords: high-frequency impedance transformations; op-amps; active devices; transistors; bandwidth limitations; circuit elements

Subjects: Semiconductor devices; Amplifiers

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