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A 0.01%THD, 70dB PSRR Single Ended Class D using variable hysteresis control for headphone amplifiers

Gaël Pillonnet
N Abouchi
  • Function : Author
  • PersonId : 963080
R Cellier
  • Function : Author
  • PersonId : 963100
A Nagari
  • Function : Author

Abstract

Switching audio amplifiers are widely used in H-Bridge topology thanks to their high efficiency; however low audio performances in single ended power stage topology is a strong weakness leading to not be used for headset applications. This paper explains the importance of efficient error correction in Single Ended Class-D audio amplifier. A hysteresis control for Class-D amplifier with a variable window is also presented. The analyses are verified by simulations and measurements. The proposed solution was fabricated in 0.13μm CMOS technology with an active area of 0.2mm². It could be used in single ended output configuration fully compatible with common headset connectors. The proposed Class-D amplifier achieves a harmonic distortion of 0.01% and a power supply rejection of 70dB with a quite low static current consumption.
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Dates and versions

hal-01103722 , version 1 (15-01-2015)

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Gaël Pillonnet, N Abouchi, R Cellier, A Nagari. A 0.01%THD, 70dB PSRR Single Ended Class D using variable hysteresis control for headphone amplifiers. IEEE International Symposium on Circuits and Systems, IEEE, May 2009, Taipei, Taiwan. pp.4, ⟨10.1109/ISCAS.2009.5117972⟩. ⟨hal-01103722⟩
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