Title :
A 2 W BTL single-chip class-D power amplifier with very high efficiency for audio applications
Author :
Lee, Jun-woo ; Lee, Jae-shin ; Lee, Gun-sang ; Kim, Sulu
Author_Institution :
Dept. of Electron. Eng., Korea Univ., Seoul, South Korea
Abstract :
A one-chip integrated circuit of a 2 W class-D audio power amplifier with very high efficiency using CMOS technology is presented in this paper. Compared with traditional class-AB amplifiers that are very poor at efficiency, mostly below 50%, the proposed amplifier has an efficiency of 90% at a smaller distortion level. Conventional class-D amplifiers generate pulse-width-modulated (PWM) signals by comparing a triangle-wave with input-signals. The proposed class-D amplifier generates signals by a delta-sigma modulation scheme for smaller chip area and simpler application circuits. This amplifier is implemented in a 0.65 μm double-metal, double-poly process and occupies 3.5 mm×3.5 mm
Keywords :
CMOS analogue integrated circuits; audio-frequency amplifiers; delta-sigma modulation; power amplifiers; power integrated circuits; 0.65 micron; 2 W; 90 percent; BTL single-chip amplifier; CMOS technology; audio applications; class-D power amplifier; delta-sigma modulation scheme; double-metal double-poly process; high efficiency; integrated circuit; CMOS integrated circuits; CMOS technology; Delta-sigma modulation; High power amplifiers; Integrated circuit technology; Pulse amplifiers; Pulse generation; Pulse width modulation; Signal generators; Space vector pulse width modulation;
Conference_Titel :
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
Conference_Location :
Geneva
Print_ISBN :
0-7803-5482-6
DOI :
10.1109/ISCAS.2000.857479
