A 2×20W 0.0013% THD+N Class-D Audio Amplifier with Consistent Performance up to Maximum Power Level

📋 论文概要

本文提出一款2×20W、THD+N低至0.0013%的D类音频放大器，采用闭环架构以改善传统开环D类放大器的线性度、噪声和电源抑制比问题，并在全功率范围内保持一致的音频性能。

💡 主要创新点

• 通过闭环控制技术有效抑制输出功率级非理想开关行为导致的失真，实现极低THD+N（0.0013%）。
• 在2×20W立体声输出下，从低功率到最大功率均能保持一致的线性度和噪声性能，克服了传统D类放大器性能随功率下降的问题。

🏷 关键词

📄 原文摘要

Michael Clifford, Pete Rathfelder, Qiyuan Liu, Siddartha Kavilipati, Aaron Vandergriff, Gerald Miaille Qualcomm, Tempe, AZ Conventional Class-D amplifiers, although more power efficient than Class-AB amplifiers, typically do not deliver the same audio quality. The non-ideal switching behavior of the output power stages can degrade the linearity, noise and powersupply-rejection-ratio (PSRR) performance of Class-D amplifiers if employed in open-loop configurations [1]. Closed-loop Class-D amplifiers shape the nonidealities of the power amplifiers (PAs) and provide improved performance [2]. Conventional analog feedback amplifiers (AFAs) sense the PA output and feed it back to compare with the audio input signal in the analog domain. Compared with AFAs, digital feedback amplifiers (DFAs) have emerged with benefits of improved control of the loop filter and pulse-width modulation (PWM) in the digital domain.

👥 作者与机构

Eric Cope, Julian Aschieri, Tony Lai, Franklin Zhao, Walter Grandfield,