Modulation and System Techniques in PWM and SDM Switching Amplifiers *

  title={Modulation and System Techniques in PWM and SDM Switching Amplifiers *},
  author={Malcolm Hawksford},
Continuousand discrete-time switching audio power amplifiers are studied both with and without feedback. Pulse-width modulation (PWM) and sigma–delta modulation (SDM) amplifier configurations are simulated and their interrelationship is described using linear phase modulation (LPM) and linear frequency modulation (LFM). Distortion generation encountered when applying negative feedback to PWM is demonstrated and strategies to improve linearity are presented. Recent innovations in SDM coding and… CONTINUE READING
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