Design of Class D Audio Amplifier with High Efficiency and High Fidelity

SUN Yu-qing; WU Chuan-xin; JIN Jie

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Design of Class D Audio Amplifier with High Efficiency and High Fidelity

更新时间：2026-09-04

- Design of Class D Audio Amplifier with High Efficiency and High Fidelity
- Vol. 27, Issue 3, Pages: 154-157(2010)
- 作者机构：
  
  1. 1 空军大连通信士官学校,辽宁,大连,116600
  2. 2 西安电子科技大学机电工程学院,陕西,西安,710071
- 作者简介：
- 基金信息：
- DOI：
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- Published：2010
- 稿件说明：
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孙煜晴, 武传欣, 金杰. 一款高效率、高保真的D类音频放大器设计[J]. 微电子学与计算机, 2010, 27(3): 154-157,162.

SUN Yu-qing, WU Chuan-xin, JIN Jie. Design of Class D Audio Amplifier with High Efficiency and High Fidelity[J]. 2010, 27(3): 154-157.
孙煜晴, 武传欣, 金杰. 一款高效率、高保真的D类音频放大器设计[J]. 微电子学与计算机, 2010, 27(3): 154-157,162. DOI：

SUN Yu-qing, WU Chuan-xin, JIN Jie. Design of Class D Audio Amplifier with High Efficiency and High Fidelity[J]. 2010, 27(3): 154-157. DOI：

摘要

设计了一款高效率、高保真的片上集成D类音频放大器.基于具有噪声整形特性的连续时间∑-Δ调制 (CT-SDM) 技术

并且通过恰当的环路设计

实现环路自振荡

而无需额外的振荡器

简化了电路

节省了芯片面积.核心电路采用低噪声、大带宽的OTA以减小输出噪声.该音频放大器在0.6mBCD工艺下实现

裸片面积仅为1.67×2.5mm.在4Ω负载条件下测试

输出功率120W时效率高达96%;1kHz输入信号

60W输出功率时

THD+N低至0.005%.

Abstract

A one-chip integrated circuit of class D audio amplifier with high efficiency and high fidelity is presented in this paper.The continuous-time sigma-delta modulation (CT-SDM) technique with noise-shaping effect is utilized in this design.A self-oscillating modulator which occupies smaller chip area is obtained based on CT-SDM.A low noise wide bandwidth OTA is also designed to decrease output noise.The amplifier is implemented in a 0.6m BCD process and occupies 1.67×2.5mm.With 4Ω load

the efficiency can reach 96% @120W output power

while the THD+N is 0.005% @60W output power with 1kHz input signal.

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