Effect of dead time on harmonic distortion in class-D audio power amplifiers

  • Mosely I
  • Mellor P
  • Bingham C
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A model is described for predicting the harmonic levels introduced by the use of dead time in class-D, PWM-driven audio power output stages. The model demonstrates that the harmonic levels are a function of load impedance, modulation depth, dead time and switching frequency. In addition, measurements show that, for audio applications, dead time is the dominant cause of power stage nonlinearity

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  • I.D. Mosely

  • P.H. Mellor

  • C.M. Bingham

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