A 0.01%THD, 70dB PSRR Single Ended Class D using variable hysteresis control for headphone amplifiers
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.
Domains
Engineering Sciences [physics]
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ID2704_GPillonnetandAl_SingleEndClassD_FinalSubmission_IEEEcompatible.pdf (287.71 Ko)
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