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

fYear

2014

fDate

10-12 Dec. 2014

Firstpage

480

Lastpage

483

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Integrated Circuits (ISIC), 2014 14th International Symposium on

Conference_Location

Singapore

Type

conf

DOI

10.1109/ISICIR.2014.7029507

Filename

7029507