CMOS Highly-Efficient Class-D Audio Amplifier
Date Issued
2006
Date
2006
Author(s)
Du, Ming-Jhe
DOI
en-US
Abstract
A one-chip integrated circuit of a 2-W class-D audio power amplifier with very high efficiency using a CMOS technology is presented. Compared with traditional class-AB amplifiers that are very poor at efficiency, most below 50%, the proposed class-D amplifier has the efficiency of 90% at the smaller distortion level. The class-D amplifiers generate pulse-width-modulated (PWM) signals by comparing a triangle-wave with input-signals. An output stage with zero dead time and high efficiency is applied to improve the linearity and reduce wasted battery energy. An approach to reducing distortion is applied by using feedback calibration.
Subjects
D類
音訊
CMOS
Class D
Audio
Type
thesis
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