Noise Shaping Filter Compensating PWM Distortion for Fully Digital Amplifier

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Other Title
  • フルデジタルアンプのためのＰＷＭ歪補償型ノイズシェーピングフィルタ
  • フルデジタルアンプのためのPWM歪補償型ノイズシェーピングフイルタ
  • フルデジタルアンプ ノ タメ ノ PWM ヒズミ ホショウガタ ノイズシェーピングフイルタ

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Description

The full-digital audio amplifiers have several merits such as a high power enabling a small size of the amplifier and digital implementation of the signal processing which allows desired precision of the processing except for the final stage switching amplifiers. Unfortunately, the pulse width modulation (PWM) causes signal distortions because of the non-linearity of the modulation from the viewpoint of the transient response. This paper proposes a compensation method of the PWM distortion with feedback approach. In the noise-shaping filter of the delta-sigma modulator to calculate the pulse codes for the PWM, the distortion caused by the PWM is evaluated and fed it back to compensate the distortion. Eventually the filter is implemented as a state-variable filter with non-linear feedback from the quantizer. The calculation of the filter elements is also described. By using proposed filters, PWM signals with small distortions and small floor noise can be obtained to realize high-fidelity audio amplifiers.

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