A low-THD class-D audio amplifier with dual-level dual-phase carrier pulsewidth modulation

Shang Hsien Yang*, Yuan Han Yang, Ke-Horng Chen, Ying Hsi Lin, Tsung Yen Tsai, Shian Ru Lin, Chao Cheng Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


In this paper, a class-D audio amplifier which combines the advantages of the phase-shifted carrier pulsewidth modulation (PWM) and the multiple-level carrier PWM is proposed with a dual-level dual-phase carrier (DLDPC) PWM. The proposed closed-loop amplifier includes a second-order integrator and a DLDPC triangular wave generator. Two sets of 180° out-of-phase triangular waves are used as carriers, and each set has its respective offset voltage level with nonoverlapping amplitude. By performing the double Fourier analysis, it can be found that the linearity can be enhanced and the distortion can be reduced with the proposed modulation. Experimental results show that the proposed fully differential DLDPC PWM class-D audio amplifier features a total harmonic distortion lower than 0.01% with an output voltage swing of ±5V.

Original languageEnglish
Article number7130610
Pages (from-to)7181-7190
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number11
StatePublished - 1 Nov 2015


  • Class-D
  • IMD
  • PWM
  • THD
  • dual-level dual-phase carrier

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