数字功放设计

论文编号:DZXX222  论文字数:13401,页数:31

摘要

 在音响领域里人们一直坚守着A类功放的阵地。认为A类功放声音最为清新透明，具有很高的保真度。但是A类功放的低效率和高损耗却是它无法克服的先天顽疾。B类功放虽然效率提高很多，但实际效率仅为50%左右，在小型便携式音响设备如汽车功放、笔记本电脑音频系统和专业超大功率功放场合，仍感效率偏低不能令人满意。所以，效率极高的D类功放，因其符合绿色革命的潮流正受着各方面的重视。
 本次设计的题目是数字功放设计，通过对语音信号的采样，量化，过滤等处理，得到失真小，功率高的输出信号。设计的D类功放芯片选择了TA2024。

关键词： 音响；功率放大器；D类；TA2024

ABSTRACT

 People had been persevering class A power amplifier in the sound world. They thought that class A power amplifier sound is clear, and has high fidelity. But class A power amplifier's low efficiency and the high loss are actually the congenital stubborn illness which it is unable to overcome. Although class B power amplifier's efficiency higher than class A, but the actual efficiency is only about 50%, in the small portable acoustic equipment like automobile power amplifier, the notebook audio frequency system and the specialized ultra high efficiency power amplifier situation, still felt the efficiency somewhat low not to be satisfied . Therefore, because of high efficiency, class D power amplifier become to be used by more and more people.
    This design's topic is design a digital power amplifier. Through to deal with voice signal's sampling, the quantification, processing and so on filtration, obtains the output signal which has low distortion and high power. I choice TA2024 to design the electric circuit
Keywords :  Sound; Power amplifier; Class D; TA2024

目录

摘要 I
ABSTRACT II
第1章 绪论 1
1.1 课题的背景和现实意义 1
 1.1.1 课题的背景 1
 1.1.2 课题研究的现实意义 1
1.2 国内外研究现状 2
1.3 课题设计的内容及要求 3
 1.3.1 课题的主要内容 3
 1.3.2 课题的要求 3
第2章 设计方案论证 5
2.1 设计方案一 5
2.2 设计方案二 5
2.3 设计方案论证 6
第3章 芯片介绍 7
3.1选择芯片应该注意的 7
3.2 TA2024介绍 7
第4章 数字功放原理介绍 10
第5章 系统硬件设计 13
5.1 系统硬件电路概述 13
 5.1.1 三角波发生器的设计 13
 5.1.2 比较器的设计 14
 5.1.3 输出滤波器的设计 15
5.2设计中的关键 16
第6章 设计D类数字功放需要解决的问题 18
第7章 毕业设计总结 22
致  谢 24
参考文献 25
附录1.TA2024 数字功放电路设计框图 26
附录2.PCB布线图 27