A 115dB-DR Audio DAC with –61dBFS Out-of-Band Noise

📋 论文概要

该论文提出了一种具有115dB动态范围和-61dBFS带外噪声的音频DAC，解决了带外噪声引起的放大器摆率、混叠以及交叉调制等问题，从而改善了音频带内的噪声和失真性能。

💡 主要创新点

• 通过创新的电路设计有效抑制了音频DAC的带外噪声，使其达到-61dBFS，避免了带外噪声对后续模拟电路的不良影响。
• 实现了115dB的高动态范围，同时保持了低失真和低噪声，适用于高性能音频应用。

🏷 关键词

📄 原文摘要

Delectronics, Enschede, The Netherlands, 3 Teledyne DALSA Semiconductors, Enschede, The Netherlands 1 2 Out-of-band noise (OBN) is troublesome in analog circuits that process the output of a noise-shaping audio DAC. It causes slewing in amplifiers and aliasing in sampling circuits like ADCs and class-D amplifiers. Nonlinearity in these circuits also causes cross-modulation of the OBN into the audio band. These mechanisms lead to a higher noise level and more distortion in the audio band. OBN also leads to interference in the LF and MF band, compromising e.g. AM radio reception. To avoid these problems, it is desired to reduce OBN power to below -60dBFS. An active low-pass filter after the DAC output can reduce the OBN power to acceptable levels, but this solution is expensive in terms of power consumption and chip area. A FIR-DAC [1] approach implements a 1b PWM modulator, followed by a semi-digital low-pass FIR reconstruction filter. It

👥 作者与机构

Hugo Westerveld1, Daniël Schinkel2,3, Ed van Tuijl1,3

University of Twente, Enschede, The Netherlands,