用于音频d类放大器的低失真数字脉宽调制

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004. Pub Date : 2004-10-26 DOI:10.1109/ISCIT.2004.1412898

A. Yoneya, A. Watanabe

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引用次数: 2

摘要

提出了一种用于高保真数字音频放大器的脉宽调制方案。均匀PWM利用过采样技术，但UPWM会造成谐波失真。使用输入信号的导数估计PWM输出端的谐波失真分量，并在δ - σ调制器的输入端抵消。δ - σ调制器的输出信号经形噪声粗量化后送入脉宽调制器。最后给出了双音测试的仿真结果，验证了该方法的有效性。

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Low distortion digital pulse width modulation for audio class-D amplifier

A pulse width modulation scheme for a high fidelity digital audio amplifier is presented. The uniform PWM is used to utilize the over sampling technology, but the UPWM causes harmonic distortion. The harmonic distortion components at the PWM output are estimated using the derivatives of the input signal and cancelled at the input of the delta-sigma modulator. The output signal of the delta-sigma modulator is coarsely quantized with shaped noise and fed to the pulse width modulator. A simulation result for a dual tone test is presented to illustrate the effectiveness of the proposed method.

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IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004.

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