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A FULLY DIFFERENTIAL DIGITAL INPUT CLASS D WITH EMI SPREADING METHOD FOR MOBILE APPLICATION

机译:具有用于移动应用的EMI传播方法的全差分数字输入类D

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Class D audio amplifiers are widely used in embedded system to achieve high efficiency. Digital class D accepts bit stream as input signal to drive loudspeaker. Major drawbacks of such systems are the non linearity due to the switched behavior and EMI radiations issued from the output low pass filter. This paper presents a digital class D amplifier with a local analog feedback loop to improve performances of the power stage and digital method to spread output spectrum in order to reduce EMI radiation. The amplifier, including digital modulator and analog power stage, has been integrated in a single chip in 0.13μm CMOS technology.
机译:D类音频放大器广泛用于嵌入式系统以实现高效率。数字类D接受位流作为输入信号以驱动扬声器。由于从输出低通滤波器发出的交换行为和EMI辐射,因此这种系统的主要缺点是非线性。本文介绍了一种数字D类放大器,具有本地模拟反馈回路,可提高功率级和数字方法以扩展输出频谱的性能,以降低EMI辐射。包括数字调制器和模拟功率级,包括数字调制器和模拟电源级的放大器已在0.13μmCMOS技术中集成在单个芯片中。

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