| Sigma-Delta调制及其在低噪声DC-DC变换器的应用 |
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| 引用本文： | 蔡曙江,王科军,周文君,严伟,李文宏.Sigma-Delta调制及其在低噪声DC-DC变换器的应用[J].固体电子学研究与进展,2010,30(4). |
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| 作者姓名： | 蔡曙江 王科军 周文君 严伟 李文宏 |
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| 摘 要： | 分析了传统PWM调制和Sigma-Delta调制在噪声性能方面的差异,以及它们对DC-DC变换器输出噪声的影响。在Chartered 0.35μm CMOS工艺条件下实现了一个基于二阶Sigma-Delta调制的低噪声DC-DC变换器,并对其中Sigma-Delta调制模块进行了流片验证。测试结果表明,Sigma-Delta调制模块能够将环路带宽内噪声抑制到-50 dB左右,并且未引入与开关频率有关的谐波成分。仿真结果表明,DC-DC变换器输出电压噪底能够达到-60 dB以下。
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| 关 键 词： | PWM调制 Sigma-Delta调制 噪声整形 低噪声DC-DC变换器 |
Sigma-Delta Modulation and Its Application in Low Noise DC-DC Converter |
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| CAI Shujiang,WANG Kejun,ZHOU Wenjun,YAN Wei,LI Wenhong.Sigma-Delta Modulation and Its Application in Low Noise DC-DC Converter[J].Research & Progress of Solid State Electronics,2010,30(4). |
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| Authors: | CAI Shujiang WANG Kejun ZHOU Wenjun YAN Wei LI Wenhong |
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| Abstract: | This paper analyzes the noise characteristics of PWM modulation and sigma-delta modulation and their different effects to the noise performance of DC-DC converter.A second-order continuous-time sigma-delta modulator is designed and fabricated on Chartered 0.35 μm CMOS process.Upon this,a low-noise DC-DC converter with sigma-delta modulation is implemented.Experimental results show that in-band noise can be suppressed to about-50 dB by sigma-delta modulator without introducing any clock-referenced harmonic contents.Simulation results show that noise floor of the output voltage of DC-DC converter can be below-60 dB. |
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| Keywords: | PWM modulation Sigma-Delta modulation noise-shaping low noise DC-DC converter |
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