A digital input class-D audio amplifier with sixth-order PWM
A digital input class-D audio amplifier with sixth-order PWM
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DOI：
10.1088/1674-4926/34/11/115001
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发表时间：
2013-11
影响因子：
5.1
通讯作者：
Luo Shumeng;Li Dongmei
中科院分区：
文献类型：
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作者：
Luo Shumeng;Li Dongmei
提出了一种采用六阶脉宽调制（PWM）调制器的数字输入D类音频放大器。该调制器将PWM发生器移入闭合Σ-Δ调制器环路。PWM发生器模块产生的噪声和失真由Σ-Δ调制器的前向环路的高增益抑制。因此，在调制器的输出处，获得非常干净的PWM信号以用于驱动D类放大器的功率级。设计了一个六阶调制器来平衡性能和系统时钟速度。该D类放大器采用标准0.18 μm CMOS工艺制造，动态范围为110 dB，信噪比为100 dB，总谐波失真加噪声为0.0056%。
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 μm 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.