A 20 W/Channel Class-D Amplifier With Near-Zero Common-Mode Radiated Emissions

被引：21

作者：

Siniscalchi, Patrick P. ^{[1
]}

Hester, Richard K. ^{[1
]}

机构：

[1] Texas Instruments Inc, Dallas, TX 75243 USA

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2009年 / 44卷 / 12期

关键词：

Audio amplifier; BD modulation; class-D; class-D amplifier; electromagnetic interference; EMI; EMC; filter-less; radiated emissions; EMI;

D O I：

10.1109/JSSC.2009.2032724

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：

A class-D amplifier that employs a new modulation scheme and associated output stage to achieve true filter-less operation is presented. It uses a new type of BD modulation that keeps the output common-mode constant, thereby removing a major contributor to radiated emissions, typically an issue for class-D amplifiers. The amplifier meets the FCC class B standard for radiated emissions without any LC filtering. It can accomplish this without any degradation to audio performance and while retaining high efficiency. THD+N is 0.19% at 1 kHz while supplying 5 W to an 8 Ohm load from a 12 V supply. Efficiency is 90% while providing 10 W under the same supply and load conditions. The new output stage occupies 1.8 mm(2) per channel using the high voltage devices of a 0.25 mu m BCD process.

引用

页码：3264 / 3271

页数：8

共 12 条

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