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Improved Class-K amplifier for headset applications

Gaël Pillonnet
A Huffenus
  • Function : Author
F Goutti
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V Rabary
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Abstract

This paper proposes an improved Class-K audio amplifier as an alternative solution to Class-AB and Class-G audio amplifiers for Headset applications. The Class-K architecture consists in a linear and a switching amplifier connected in parallel to the same speaker. The advantage of this solution is to associate the power efficiency of the switching amplifier with the linearity of a linear amplifier. However, the Class-K may suffer from static consumption. Three methods are presented in order to compensate the topology's disadvantages: a ternary modulation, a two-stage linear amplifier and a low idle switching amplifier. In this paper, we present the Class-K operating principle, a topological comparison and solutions to improve high static consumption. The simulation results prove the validity of these solutions, achieving less than 2mA of static current.
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Dates and versions

hal-01103672 , version 1 (15-01-2015)

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E Sturtzer, Gaël Pillonnet, A Huffenus, N Abouchi, F Goutti, et al.. Improved Class-K amplifier for headset applications. IEEE International NEWCAS Conference, 2010, Montreal, Canada. pp.5, ⟨10.1109/NEWCAS.2010.5603759⟩. ⟨hal-01103672⟩
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