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Class D RF Power Amplifiers

Class D RF Power Amplifiers

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A Class D amplifier is a switching-mode amplifier that uses two active devices driven in a way that they are alternately switched ON and OFF. The active devices form a two-pole switch that defines either a rectangular voltage or rectangular current waveform at the input of a tuned circuit that includes the load. The load circuit contains a bandor low-pass filter that removes the harmonics of the rectangular waveform and results in a sinusoidal output. In its simpler form, the load circuit can be a series or parallel resonant circuit tuned to the switching frequency; such a load circuit will be considered here. In practical applications, this circuit can be replaced by narrowband pior T-matching circuits, or by bandor low-pass filters (in wideband amplifiers).

Chapter Contents:

  • 3.1 Idealized Operation of the Class D Amplifier
  • 3.2 Practical Considerations
  • 3.3 Class BD Amplifier
  • 3.4 Class DE Amplifier
  • 3.5 Class D Frequency Multipliers
  • 3.6 CAD of Class D Circuit
  • 3.8 Notes
  • 3.7 References

Inspec keywords: power amplifiers; band-pass filters; wideband amplifiers; switches; low-pass filters; radiofrequency amplifiers

Other keywords: parallel resonant circuit; load circuit; active devices; band-pass filter; wideband amplifiers; low-pass filter; rectangular voltage; rectangular current waveform; switching-mode amplifier; narrowband pior T-matching circuits; two-pole switch; class D RF power amplifiers

Subjects: Relays and switches; Amplifiers

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