THD of Closed-Loop Analog PWM Class-D Amplifiers

  title={THD of Closed-Loop Analog PWM Class-D Amplifiers},
  author={Wei Shu and Joseph Sylvester Chang},
  journal={IEEE Transactions on Circuits and Systems I: Regular Papers},
This paper presents an analytical modeling of the mechanisms of total harmonic distortion (THD) of second-order based single-feedback and double-feedback class-D amplifiers (CDAs). We show that the overall THD in these closed-loop CDAs comprises the THD of their open-loop counterparts reduced by the Loop Gain+1 and the THD due to the combined phase and duty cycle error that is due to feedback, hence unique to closed-loop CDAs. We show that the latter THD can be large and is the dominant THD at… CONTINUE READING
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