Class-D Amplifier Power Stage With PWM Feedback Loop

  title={Class-D Amplifier Power Stage With PWM Feedback Loop},
  author={Chun Kit Lam and Meng Tong Tan and Stephen M. Cox and Kiat Seng Yeo},
  journal={IEEE Transactions on Power Electronics},
This paper presents a second-order pulsewidth modulation (PWM) feedback loop to improve power supply rejection (PSR) of any open-loop PWM class-D amplifiers (CDAs). PSR of the audio amplifier has always been a key parameter in mobile phone applications. In contrast to class-AB amplifiers, the poor PSR performance has always been the major drawback for CDAs with a half-bridge connected power stage. The proposed PWM feedback loop is fabricated using GLOBALFOUNDRIES' 0.18-μm CMOS process… CONTINUE READING


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