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

摘要

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 0.13 mum CMOS technology with an active area of 0.2 mm