Title :
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
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;
Conference_Titel :
NORCHIP, 2008.
Conference_Location :
Tallinn
Print_ISBN :
978-1-4244-2492-4
Electronic_ISBN :
978-1-4244-2493-1
DOI :
10.1109/NORCHP.2008.4738304
