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D类功放中的Σ-Δ调制器分析与设计 被引量:5

Analysis and Design of Σ-Δ Modulator for Class D Power Amplifier
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摘要 设计一种新型低非线性失真拓扑的7阶1-bitΣ-Δ调制器,该调制器可以直接用于模拟音频信号输入带反馈的D类功率放大器中。通过仿真表明,调制器的最大稳定输入值可以达到0.9,信噪比可达到130 dB以上,即采用这种调制器的D类功放可实现90%的功率转化效率和高保真的音质。同时从新的角度阐释了高阶1-bitΣ-Δ调制器的工作原理和设计过程。 This paper presents a novel seven order one- bit ∑-△ modulator by using lower nonlinear distortion topology, which can be used in analog input class D audio power amplifier with feedback loop. By means of simulations, the normalized stable input reaches 0. 88 and SNB exceeds 130db, so 88 % power transfer efficiency and high sound quality can be realized by the power class D that adopts the modulator designed here. At the same time, the principle and design process of high order 1 - bit ∑-△ modulator are unveiled by another points of view.
作者 聂彬 李开航
机构地区 厦门大学
出处 《现代电子技术》 2008年第8期78-81,共4页 Modern Electronics Technique
关键词 D类功放 非线性失真 ∑-△调制器 信噪比 class D power - amplifier non - linear distortion ∑-△ modulator SNR
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参考文献8

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同被引文献29

  • 1刘德才,高明煜.频率抖动技术抑制D类放大器电磁干扰[J].杭州电子科技大学学报(自然科学版),2009,29(3):20-23. 被引量:1
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