An Integrated 3-Level Fully Adjustable PWM Class-D Audio Amplifier in 0.35μm CMOS

Author

Lindstrand, Jonas ; Radjen, Dejan ; Fitzgerald, Robert ; Axholt, Andreas ; Sjöland, Henrik

Author_Institution

Dept. of Electr. & Inf. Technol., Lund Univ., Lund, Sweden

fYear

2008

fDate

16-17 Nov. 2008

Firstpage

168

Lastpage

171

Abstract

A class-D audio amplifier utilizing a fully adjustable 3-level pulse width modulation (PWM) is presented. The amplifier is fully integrated in a 0.35 μm CMOS process, and is powered by a 3.3 V power supply. The system includes an internal fully adjustable triangle-wave oscillator, which is used to generate the PWM carrier. Delivering an output power of 300 mW is a differential bridge (7.5 cm pMOS, 3 cm nMOS), driving a 16 Ω load. The THD+N of the system is less than 0.2%, and the efficiency at 300 mW is 89%.

Keywords

CMOS integrated circuits; audio-frequency amplifiers; pulse width modulation; CMOS process; PWM carrier; adjustable triangle-wave oscillator; class-D audio amplifier; fully adjustable PWM class-D audio amplifier; power 300 mW; power supply; pulse width modulation; voltage 3.3 V; Bridges; CMOS process; Oscillators; Power amplifiers; Power generation; Power supplies; Pulse amplifiers; Pulse width modulation; Pulsed power supplies; Space vector pulse width modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

NORCHIP, 2008.

Conference_Location

Tallinn

Print_ISBN

978-1-4244-2492-4

Electronic_ISBN

978-1-4244-2493-1

Type

conf

DOI

10.1109/NORCHP.2008.4738304

Filename

4738304