Integrated low-voltage filter-less class-D Audio power amplifier with PWM DC/DC buck converter

Author

Liou, Wan-Rone ; Pan, Chun-Nan ; Lin, Lia-Hsin

Author_Institution

Nat. Taipei Univ., Sanxia, Taiwan

fYear

2010

fDate

28-30 July 2010

Firstpage

546

Lastpage

550

Abstract

Consumers desire that new generation of devices will be developed with smaller physical size and lower cost than existing devices. This paper presents the design of an integrated class D audio power amplifier with step-down (Buck) DC to DC converter. The high efficiency pulse-width modulation (PWM) buck converter is used to supply 1.5 V for the class D amplifier. The operating voltage range can be from 3V to 5V which is used for mobile devices. The class D amplifier uses the three level pulse width modulation (PWM) to eliminate the external output low-pass filter. The circuit is designed with TSMC 0.35um 2P4M 3.3V/5V mixed-signal CMOS process. The best total power efficiency of this integrated circuit achieves 84%, and the total harmonic distortion (THD) is less than 0.26% at 10 KHz with 8Ω load.

Keywords

DC-DC power convertors; PWM power convertors; audio-frequency amplifiers; harmonic distortion; low-power electronics; mixed analogue-digital integrated circuits; power amplifiers; PWM DC/DC buck converter; efficiency 84 percent; frequency 10 kHz; integrated low-voltage filter-less Class-D audio power amplifier; mixed-signal CMOS process; pulse-width modulation buck converter; size 0.35 mum; voltage 3 V to 5 V; Batteries; Pulse width modulation; RNA;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems (ICCCAS), 2010 International Conference on

Conference_Location

Chengdu

Print_ISBN

978-1-4244-8224-5

Type

conf

DOI

10.1109/ICCCAS.2010.5581940

Filename

5581940