用於數位D類放大器的高效能三角積分調變器設計; Design of High-Performance Sigma-Delta Modulators for Class-D Digital Amplifiers

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/10295

Title:	用於數位D類放大器的高效能三角積分調變器設計;Design of High-Performance Sigma-Delta Modulators for Class-D Digital Amplifiers
Authors:	陳威佐;Wei-Tso Chen
Contributors:	電機工程研究所
Keywords:	三角積分調變器;數位Ｄ類放大器;Sigma-Delta Modulators;Class-D Digital Amplifiers
Date:	2008-10-02
Issue Date:	2009-09-22 12:11:11 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本論文提出一種應用於數位D類放大器的高效能三角積方調變器電路。D類放大器較傳統AB類的音頻放大器具有更高效能的優勢，而數位化的D類放大器可以簡化音頻轉換器電路，節省電路面積與功耗。然而傳統D類放大器使用脈衝寬度訊號來實現，除了諧波失真嚴重外，較小的訊號動態範圍造成效能不佳。本論文的D類放大器設計使用三角積分調變技術產生脈衝訊號，用以改善上述缺點。藉由分析兩種不同回授架構的三角積分調變器電路並研究兩者對D類放大器的好壞，本論文提出一個新三角積分調變器電路架構，使之較傳統電路有更廣的動態範圍和更低的諧波失真。經硬體實現驗證顯示，本論文所提的新架構，電路複雜度與傳統架構相仿，而諧波失真較之傳統架構降低了大約10%左右；其調變指數可達100%，大幅改善傳統架構最大輸入振幅受限的缺點。本論文所提的新架構能有效提升電路效能與品質。 A high performance sigma-delta modulator for class-D audio amplifiers is proposed in this thesis. Class-D topology is superior to class-AB one for its higher efficiency. In addition, realizing class-D amplifier by all digital can greatly reduce audio data converter circuits, saving hardware and power consumption. However, the traditional class-D amplifier based on pulse-width modulation suffers from larger harmonic distortions and poor performance caused by limited dynamic range. This research uses sigma-delta modulation techniques to mitigate such drawback. By analyzing two different types of sigma-delta modulator topologies, a new architecture is proposed. The experimental results show that, compared to the conventional class-D sigma-delta modulators, the proposed architecture can improve total harmonic distortions about 10% and can operate with a modulation index of 100% maximum input range, with same hardware complexity.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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