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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
Published in:
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
(Volume:5
)
Date of Conference: 2000
- Page(s):
- 493 - 496 vol.5
- Meeting Date :
- 28 May 2000-31 May 2000
- Print ISBN:
- 0-7803-5482-6
- INSPEC Accession Number:
- 6777198
- Conference Location :
- Geneva
- Digital Object Identifier :
- 10.1109/ISCAS.2000.857479
- Product Type:
- Conference Publications
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