An 82mW ΔΣ-Based Filter-Less Class-D Headphone Amplifier with -93dB THD+N, 113dB SNR and 93% Efficiency

📋 论文概要

本文提出了一种基于ΔΣ调制的免滤波器Class-D耳机放大器，用于主动降噪耳机，实现了82mW功耗、-93dB THD+N、113dB SNR和93%效率，解决了传统Class-A/AB效率低和Class-G/H需外部元件的问题。

💡 主要创新点

• 采用ΔΣ调制实现免滤波器Class-D架构，在低功耗下获得高保真音频输出。
• 通过优化调制和驱动电路，在82mW功耗下达到-93dB THD+N和113dB SNR的优异性能。
• 实现93%的功率效率，显著延长电池寿命，适用于便携式ANC耳机。

🏷 关键词

📄 原文摘要

(ANC) headphones require low-latency digital-input headphone drivers that consume the lowest possible power to maximize battery life while providing high-fidelity audio playback. Typical headphone drivers use Class-A/AB topologies, and to improve power efficiency, Class-G/H drivers with a ground-center operation are used at the expense of using external components to decouple the required extra supply rails [1-3]. Closed-loop Class-D speaker drivers have become popular [4-6], and filter-less configurations are common in the 1-to-3W output range [6]. Some of the challenges associated with a Class-D driver for headphone applications are to maintain high linearity and SNR for low-voltage supply rails while

👥 作者与机构

Atsushi Matamura1, Naoaki Nishimura1, Preston Birdsong2,

Abhishek Bandyopadhyay2, Adam Spirer2, Mariana Markova2, Shaolong Liu2 Analog Devices, Tokyo, Japan Analog Devices, Wilmington, MA 1 2 True Wireless Stereo/True Wireless Active-Noise-Canceling