Title :
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
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;
Conference_Titel :
Communications, Circuits and Systems (ICCCAS), 2010 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-8224-5
DOI :
10.1109/ICCCAS.2010.5581940
