A 2.65 W high-fidelity filterless class D audio amplifier using multiple loop filters

  • Authors:

  • Xin Ming;Xiao-Min Zhang;Zhuo Wang;Bo Zhang

  • Affiliations:

  • State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China 610054;State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China 610054;State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China 610054;State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China 610054

  • Venue:
  • Analog Integrated Circuits and Signal Processing
  • Year:
  • 2013

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Abstract

The design of a 2.65 W, high-fidelity, filterless Class D audio amplifier in a standard 0.5 μm CMOS technology is proposed in this paper, where an architecture with multiple loop filters is utilized. This structure attenuates residual clock signals around the loop allowing very low total harmonic distortion (THD) and intermodulation distortion to be achieved in conjunction with high power supply rejection ratio (PSRR). The active area of this circuit is about 1.5 脳 1.5 mm2. The THD + N is