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A 2 W BTL single-chip class-D power amplifier with very high efficiency for audio applications

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4 Author(s)
Jun-Woo Lee ; Dept. of Electron. Eng., Korea Univ., Seoul, South Korea ; Jae-Shin Lee ; Gun-Sang Lee ; Kim, S.

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

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Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on  (Volume:5 )

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