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Classic RF Power Amplifiers

Classic RF Power Amplifiers

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This chapter discusses several types of RF power amplifiers (PAs), most often called Class A, AB, B, and C. Class C amplifiers, in turn, are usually divided into three categories: a) current-source (or underdriven) Class C PAs, b) saturated (or overdriven) Class C PAs, and c) mixed-mode Class C PAs. With the exception of mixed-mode Class C PAs, which behave somewhat differently, the other circuits have the following common features: they have the same basic collector circuit schematic; the circuits are all driven with sinusoidal (or approximately sinusoidal) waveforms; and the active device behaves, at least for a certain portion of the RF cycle, as a controlled-current source.

Chapter Contents:

  • 2.1 Class A Amplifiers
  • 2.2 Class B and AB Amplifiers
  • 2.3 Class C Amplifiers
  • 2.4 Bias Circuits
  • 2.5 Large Signal Parameters
  • 2.6 Narrowband Matching Networks
  • 2.7 Broadband Matching Circuits
  • 2.8 Gain Leveling and VSWR Correction
  • 2.9 Amplitude Modulation
  • 2.10 Class C Frequency Multipliers
  • 2.11 Stability of RF Power Amplifiers
  • 2.12 Thermal Calculation and Mounting Considerations
  • 2.13 Notes
  • 2.14 References

Inspec keywords: power amplifiers; radiofrequency amplifiers

Other keywords: current source class C amplifiers; classic RF power amplifiers; controlled current source; mixed mode class C amplifiers; class AB amplifiers; RF cycle; active device; saturated class C amplifiers; sinusoidal waveforms; collector circuit schematic

Subjects: Amplifiers

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