A Power Efficient Audio Amplifier Combining Switching and Linear Techniques

R.A.R. van der Zee, A.J.M. van Tuijl

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    3 Citations (Scopus)
    288 Downloads (Pure)


    Integrated Class D audio amplifiers are very power efficient, but require an external filter which prevents further integration. Also due to this filter, large feedback factors are hard to realise, so that the load influences the distortion- and transfer characteristics. The amplifier presented in this paper consists of a switching part that contains a much simpler filter, and a linear part that ensures a low distortion and flat frequency response. A 30W version was realised. The switching part of the amplifier was integrated in a BCD process. Together with a linear part and with a loudspeaker as load, it has a flat frequency response +/- 0.3dB, a dissipation that is up to 5 times lower than a traditional class AB audio amplifier, and a distortion of <0.02% over power and frequency range.
    Original languageEnglish
    Title of host publicationProceedings of the 24th European Solid-State Circuits Conference (ESSCIRC)
    Place of PublicationPiscataway, NJ
    Number of pages4
    ISBN (Print)2-86332-235-4
    Publication statusPublished - 22 Sep 1998
    Event24th European Solid-State Circuits Conference, ESSCIRC 1998 - The Hague, Netherlands
    Duration: 22 Sep 199824 Sep 1998
    Conference number: 24


    Conference24th European Solid-State Circuits Conference, ESSCIRC 1998
    Abbreviated titleESSCIRC
    CityThe Hague


    • Power amplifiers
    • Filters
    • Pulse width modulation
    • Loudspeakers
    • Feedback
    • Pulse amplifiers
    • Impedance
    • Frequency
    • Circuits
    • High power amplifiers


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