A 121.7dB DR and -109.0dB THD+N Filterless Digital-Input Class-D Amplifier with an HV Multibit IDAC Using Tri-level Output and Employing a Transition-Rate-Balanced Bidirectional RTDEM Scheme

📋 论文概要

本文提出了一种采用高压多比特电流舵DAC（IDAC）和三电平输出的无滤波器数字输入Class-D音频放大器，实现了121.7dB的动态范围和-109.0dB的总谐波失真加噪声，解决了传统数字输入Class-D放大器动态范围有限（~115dB）和THD+N较差（~-98dB）的问题。

💡 主要创新点

• 采用高压多比特IDAC架构，结合三电平输出技术，显著提升了动态范围和线性度。
• 实现无滤波器输出，降低了系统复杂度并保持了高性能指标。

🏷 关键词

📄 原文摘要

Digital-input Class-D amplifiers (CDAs) are widely used in audio applications and offer high power efficiency and high levels of integration. As human ears have a dynamic range (DR) of ~130dB, high DR is preferred in high-performance audio CDAs, and low THD+N is required for sound fidelity. Prior digital-input CDAs often employ multi-bit resistive DACs (RDACs) [1] or current-steering DACs (IDACs) [2], but their DR and THD+N are limited to ~115dB and ~-98dB respectively. In [3], a capacitive-DAC-based digital-input CDA achieves high DR (120.9dB) and low THD+N (-111.2dB). However, it is only suitable for CDAs employing an LC filter and, therefore, does not support the low-cost filterless configuration. IDACs using tri-level unit cells can potentially offer higher DR than their

👥 作者与机构

Huajun Zhang*1, Mingshuang Zhang*1, Mengying Chen1, Arthur Admiraal1,

Miao Zhang1, Marco Berkhout2, Qinwen Fan1 Delft University of Technology, Delft, The Netherlands Goodix Technology, Nijmegen, The Netherlands *Equally Credited Authors (ECAs) 1