High-efficiency dynamic supply CMOS audio power amplifier for low-power applications

被引：7

作者：

Gubelmann, J. ^{[1
]}

Dal Fabbro, P. A. ^{[1
]}

Pastre, M. ^{[1
]}

Kayal, M. ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Elect Lab LEG, CH-1015 Lausanne, Switzerland

来源：

MICROELECTRONICS JOURNAL | 2009年 / 40卷 / 08期

关键词：

Audio power amplifier; CMOS integrated circuit; Low power; Efficiency enhancement; Adaptive polarization; VOLTAGE;

D O I：

10.1016/j.mejo.2009.03.003

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper describes the analysis and design of a dynamic supply CMOS audio power amplifier for low-power applications. The dynamic supply technique is used to increase the efficiency of a class AB power amplifier. The polarization of its output stage is adaptive so that the maximum efficiency enhancement can be achieved without jeopardizing the linearity of the system. Two types of adaptive polarization are proposed and compared. A concept of power supplies switching is also proposed. Simulation results are presented showing that an efficiency of 53.6% at a total harmonic distortion (THD) of less than 0.1% can be achieved, whereas the maximal theoretical value for a class AB amplifier is approximately 33.3%. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1175 / 1183

页数：9

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