Clipping Compensation of Noise Shaper for Digital Audio Amplifier

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概要

• 論文の詳細を見る

• The Noise Shaper of a full digital amplifier overflows randomly when the Modulation Index of PWM is higher than a certain value. The clipping from the overflow produces an abrupt increase of THD+N that limits MI or the maximum output power. In this paper, we discussed the reason of NS overflow and derived the critical value of MI. We proposed a compensation method for the clipping error and optimized compensation in the audio band. The measurement results show that the proposed method can increase the maximum output power by 6.4% at a 1% THD+N condition. The compensation is more important where the power supply voltage and speaker impedance are difficult to change as that in a car stereo or mobile.

• 2011-08-01

著者

• Sung Koeng-mo

  Seoul National University

• PARK Kyoungsoo

  Seoul National University

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• Clipping Compensation of Noise Shaper for Digital Audio Amplifier

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