A digital input class-D audio amplifier with sixth-order PWM

被引：1
|
作者：
Luo Shumeng [1 ]
Li Dongmei [2 ]
机构：
[1] Tsinghua Univ, Inst Microelect, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
来源：
JOURNAL OF SEMICONDUCTORS | 2013年 / 34卷 / 11期
基金：
国家高技术研究发展计划(863计划); 中国国家自然科学基金;
关键词：
PWM; class-D digital audio; sigma-delta;
D O I：
10.1088/1674-4926/34/11/115001
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A digital input class-D audio amplifier with a sixth-order pulse-width modulation (PWM) modulator is presented. This modulator moves the PWM generator into the closed sigma-delta modulator loop. The noise and distortions generated at the PWM generator module are suppressed by the high gain of the forward loop of the sigma-delta modulator. Therefore, at the output of the modulator, a very clean PWM signal is acquired for driving the power stage of the class-D amplifier. A sixth-order modulator is designed to balance the performance and the system clock speed. Fabricated in standard 0.18 mu m CMOS technology, this class-D amplifier achieves 110 dB dynamic range, 100 dB signal-to-noise rate, and 0.0056% total harmonic distortion plus noise.
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页数：6
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