A Single Chip 1 W CMOS Audio Power Amplifier with Pseudo Buffer Analog and Class D Switching Mixed Mode for Mobile Application

Ji-Yeoul RYOO  Gyu-Hyeong CHO  

IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.9   pp.1886-1892
Publication Date: 2005/09/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.9.1886
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
analog,  switching,  audio power amplifier,  reverse recovery current,  on-chip,  

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A single chip analog and class D switching mixed mode audio power amplifier using 0.35 µm CMOS process is presented in this paper. It has on-chip power MOSFET's and adopts a novel reverse recovery current free gate control that can reduce EMI noise and current stress of the power MOSFET's. It shows about 0.1% THD at 1 kHz and up to 87% efficiency at 4 Ω BTL at 3.3 V single power supply.