Title :
A self-oscillating class D audio amplifier with dual voltage and current feedback
Author :
Nashit, S. ; Adrian, V. ; Cui, K. ; Quoc-An Mai ; Bah-Hwee Gwee ; Chang, J.S.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
Abstract :
We propose a self-oscillating PWM Class D audio amplifier with dual voltage and current feedback. The voltage feedback is taken after the output filter to mitigate any negative effects of the output filter. The current feedback is employed to mitigate the switching ripple voltage and its associated power dissipation. Simulation results using discrete components show that the proposed amplifier achieves the lowest THD+N of 0.04 % at 25 mW output power, and a maximum power efficiency of 94 % at 1.7 W output power with a THD+N of 1.18 %.
Keywords :
audio-frequency amplifiers; circuit oscillations; feedback amplifiers; filters; harmonic distortion; pulse width modulation; THD+N; current feedback; dual voltage feedback; efficiency 94 percent; output filter; power 1.7 W; power 25 mW; power dissipation; self-oscillating PWM class D audio amplifier; switching ripple voltage mitigation; Class D; Pulse Width Modulation; audio amplifiers; hysteretic comparator; self-oscillating;
Conference_Titel :
Integrated Circuits (ISIC), 2014 14th International Symposium on
Conference_Location :
Singapore
DOI :
10.1109/ISICIR.2014.7029507
