采用脉冲密度调制的D类音频放大器的互调失真

2016 Zooming Innovation in Consumer Electronics International Conference (ZINC) Pub Date : 2016-06-01 DOI:10.1109/ZINC.2016.7513652

Svjetlana Kovačević, T. Pesic-Brdanin, J. Galic

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引用次数: 1

摘要

本文对D类音频放大器的互调失真进行了分析。设计了采用mosfet开关模式的D类音频放大器。放大系统包括一个调制器和一个输出低通滤波器。脉冲宽度调制和脉冲密度调制两种调制技术都用于驱动D类放大级。研究了开关频率对总二阶和三阶互调失真积的影响。结果表明，对于脉冲密度调制，总的互调失真保持在允许的范围内。

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Intermodulation distortion of class D audio amplifier using pulse density modulation

In this paper, an analysis of intermodulation distortion of class D audio amplifier is presented. Class D audio amplifier uses MOSFETs in switching mode is designed. The amplifier system contains a modulator and an output low-pass filter. Both modulation techniques, pulse width modulation and pulse density modulation, are used to drive class D amplifier stage. The influence of switching frequency on total second- and third-order intermodulation distortion products is examined. It is shown that for pulse density modulation, total intermodulation distortion remains within the permissible range of values.

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2016 Zooming Innovation in Consumer Electronics International Conference (ZINC)

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