| 基于ΣΔ调制的D类放大器系统设计与仿真 |
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| 引用本文： | 高爱国.基于ΣΔ调制的D类放大器系统设计与仿真[J].电子科技,2012,25(5):17-19,23. |
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| 作者姓名： | 高爱国 |
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| 作者单位： | (中国人民解放军92853部队 4分队,辽宁 葫芦岛 125106) |
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| 摘 要： | 针对传统D类放大器脉宽调制技术引起的电磁干扰问题,将一个5阶低通ΣΔ调制器应用于一种带反馈闭环结构的D类放大器中。通过建立ΣΔ调制D类放大器的非理想模型,考察输出信号的功率谱特性。仿真分析表明,该模型能够有效抑制低频段的噪声和谐波失真,在基带内实现较高的信噪比,应用于D类功放,与传统脉宽调制方式相比,有效地改善电磁干扰性能。
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| 关 键 词： | D类放大器 &Sigma &Delta 调制 电磁干扰 功率谱密度 |
System Design and Simulation of Class D Amplifier Using ΣΔ Modulator |
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| GAO Aiguo.System Design and Simulation of Class D Amplifier Using ΣΔ Modulator[J].Electronic Science and Technology,2012,25(5):17-19,23. |
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| Authors: | GAO Aiguo |
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| Affiliation: | (Fourth Divisions,Unit 92853,PLA,Huludao 125106,China) |
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| Abstract: | In view of the fact that pulse width modulation may cause electromagnetic interference(EMI) in Class D Amplifier,this article applies a five-order low pass Σ Δ modulator to A class D amplifier with a feedback loop structure.The output signal spectrum properties are studied by establishing a nonideal model of class D amplifier.Simulation results show that this model can reduce the noise and harmonic distortion in low frequency band,achieve higher signal-to-noise ratio in baseband.Its application in the class D amplifiers can improve the electromagnetic interference performance effectively compared with traditional pulse width modulation. |
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| Keywords: | class D amplifier ΣΔ modulation EMI power spectrum density |
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