Phase-shift self-oscillating class-D audio amplifier with multiple-pole feedback filter

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概要

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• A self-oscillating class-D audio amplifier employing a multiple-pole feedback filter is introduced intended for portable multimedia devices. As the oscillation is based on the Barkhausens criterion, the signal-dependent oscillation frequency is of great concern. Employing higher-order filters contributes to the stable oscillation frequency depending on the input amplitude as well as improves PSRR and THD. The concept is revealed comparatively with other works, and a design implemented in a 0.35um CMOS process under 3.3V supply is proposed and verified.

著者

• Mo Hyunsun

  Department of Electronics Engineering, Graduate School, Kookmin University

• Kim Daejeong

  Department of Electronics Engineering, Graduate School, Kookmin University

• Jeong Jaehoon

  July Semiconductor, #207 Sogang Business Center, Sogang Univ

• Lee Hyungjin

  Department of Electronics Engineering, Graduate School, Kookmin University

• Lee Wanil

  Department of Electronics Engineering, Graduate School, Kookmin University

• Jeong Mingi

  Department of Electronics Engineering, Graduate School, Kookmin University

関連論文

• Phase-shift self-oscillating class-D audio amplifier with multiple-pole feedback filter
• Piecewise linear-in-dB variable gain amplifier to enhance integral nonlinearity

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