A phase-shift self-oscillating stereo class-D amplifier for battery-powered applications

Author

Huffenus, Alexandre ; Pillonnet, Gaël ; Abouchi, Nacer ; Goutti, Frédéric ; Rabary, Vincent ; Specq, Cécile

Author_Institution

Lyon Inst. of Nanotechnol., CPE Lyon, Villeurbanne, France

fYear

2010

fDate

May 30 2010-June 2 2010

Firstpage

769

Lastpage

772

Abstract

This paper presents a highly efficient stereo audio amplifier, based on a self-oscillating modulator. This modulation scheme has been analyzed and shows to have a higher bandwidth and error correction than standard Pulse Width Modulation (PWM). A practical implementation in CMOS 0.25um technology has been done to validate our theoretical and simulation results, based on a modified PWM amplifier. Our amplifier demonstrated a Total Harmonic Distortion plus Noise (THD+N) as low as 0.007%, current consumption is 3.88mA at 3.6V (stereo) and the efficiency reaches 88% into 8Ohms. The integrated circuit measures 1.6×1.6mm and is able to work at supply voltages from 2.3V to 5.5V.

Keywords

audio-frequency amplifiers; harmonic distortion; modulators; pulse width modulation; CMOS technology; PWM amplifier; THD+N; battery powered applications; current 3.88 mA; current consumption; error correction; phase-shift self-oscillating stereo audio class-D amplifier; pulse width modulation; self oscillating modulator; size 0.25 mum; total harmonic distortion plus noise; voltage 2.3 V to 5.5 V; Bandwidth; CMOS technology; Circuit simulation; Error correction; Integrated circuit technology; Low-noise amplifiers; Pulse amplifiers; Pulse width modulation; Space vector pulse width modulation; Total harmonic distortion;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on

Conference_Location

Paris

Print_ISBN

978-1-4244-5308-5

Electronic_ISBN

978-1-4244-5309-2

Type

conf

DOI

10.1109/ISCAS.2010.5537458

Filename

5537458