A power-efficient audio amplifier combining switching and linear techniques

Ronan A.R. van der Zee, Adrianus Johannes Maria van Tuijl

Research output: Contribution to journalArticleAcademicpeer-review

59 Citations (Scopus)
36 Downloads (Pure)

Abstract

Integrated class-D audio amplifiers are very power efficient but require an external LC reconstruction filter, which prevents further integration. Also due to this filter, large feedback factors are hard to realize, so that the load influences the distortion and transfer characteristics. The 30 W 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. The switching part of the amplifier was integrated in a BCD process. Combined with a linear part and with a loudspeaker as load, it has a flat frequency response ±0.3 dB, a dissipation that is up to five times lower than a traditional class-AB audio amplifier, and a distortion of <0.02% over power and frequency range
Original languageUndefined
Pages (from-to)985-991
Number of pages7
JournalIEEE journal of solid-state circuits
Volume34
Issue number7
DOIs
Publication statusPublished - 1999

Keywords

  • METIS-111650
  • IR-14521

Cite this

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title = "A power-efficient audio amplifier combining switching and linear techniques",
abstract = "Integrated class-D audio amplifiers are very power efficient but require an external LC reconstruction filter, which prevents further integration. Also due to this filter, large feedback factors are hard to realize, so that the load influences the distortion and transfer characteristics. The 30 W 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. The switching part of the amplifier was integrated in a BCD process. Combined with a linear part and with a loudspeaker as load, it has a flat frequency response ±0.3 dB, a dissipation that is up to five times lower than a traditional class-AB audio amplifier, and a distortion of <0.02{\%} over power and frequency range",
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author = "{van der Zee}, {Ronan A.R.} and {van Tuijl}, {Adrianus Johannes Maria}",
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A power-efficient audio amplifier combining switching and linear techniques. / van der Zee, Ronan A.R.; van Tuijl, Adrianus Johannes Maria.

In: IEEE journal of solid-state circuits, Vol. 34, No. 7, 1999, p. 985-991.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - A power-efficient audio amplifier combining switching and linear techniques

AU - van der Zee, Ronan A.R.

AU - van Tuijl, Adrianus Johannes Maria

PY - 1999

Y1 - 1999

N2 - Integrated class-D audio amplifiers are very power efficient but require an external LC reconstruction filter, which prevents further integration. Also due to this filter, large feedback factors are hard to realize, so that the load influences the distortion and transfer characteristics. The 30 W 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. The switching part of the amplifier was integrated in a BCD process. Combined with a linear part and with a loudspeaker as load, it has a flat frequency response ±0.3 dB, a dissipation that is up to five times lower than a traditional class-AB audio amplifier, and a distortion of <0.02% over power and frequency range

AB - Integrated class-D audio amplifiers are very power efficient but require an external LC reconstruction filter, which prevents further integration. Also due to this filter, large feedback factors are hard to realize, so that the load influences the distortion and transfer characteristics. The 30 W 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. The switching part of the amplifier was integrated in a BCD process. Combined with a linear part and with a loudspeaker as load, it has a flat frequency response ±0.3 dB, a dissipation that is up to five times lower than a traditional class-AB audio amplifier, and a distortion of <0.02% over power and frequency range

KW - METIS-111650

KW - IR-14521

U2 - 10.1109/4.772414

DO - 10.1109/4.772414

M3 - Article

VL - 34

SP - 985

EP - 991

JO - IEEE journal of solid-state circuits

JF - IEEE journal of solid-state circuits

SN - 0018-9200

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