立体声功率放大器设计

毕业论文（设计）立体声功率放大器设计

院系：传媒技术学院

专业：电子信息工程

班级：B1001班

姓名：肖奇峰

学号：***********

指导教师：梁**

2014年5月4日

立体声功率放大器设计

The Design of Stereo Power Amplifier

摘要

随着社会的发展，人们的追求，现代人对听觉的水平要求越来越高，所以对音响的音质真实性要求越来越多，并对音频信号进行适当加工修饰，使声音音质真实优美动听。因此，我们这次的主要研究对象是立体声功率放大器，功率放大器是在音响系统中把微弱的音频信号放大到足以驱动喇叭单元工作，重放出人耳能听到的声音的设备。本次设计主要是采用功放芯片LM1875芯片设计的功率放大器，他在应用场合能提供非常低的失真度和高质量的音色，还具有高增益、快转换速率、宽功率带宽、大输出电压摆幅、大电流能力和非常宽的电源范围等特性。功放部分的外围结构比较简单，整个功放分为前级放大、音调控制、中级放大和后级放大。电源部分为对偶式整流电路，分别输出两个不同的电压给功放供电。本次设计的功放可用于家庭音响，立体声唱机等。

关键字：立体声集成功放功率放大器

Abstract

With the development of society, people's pursuit, the modern requirements for hearing level is getting higher and higher, so the sound quality requirements more and more authenticity, so the sound quality requirements more and more authenticity. And appropriate modification of audio signal, to make the sound quality real and beautiful. Therefore, the main research object is stereo power amplifier; the power amplifier is the equipment that audio signal amplification to drive the loudspeaker unit work in sound system, reproducing the human ear can hear the sound. The design of power amplifier focused on using the power amplifier chip LM1875 to design, it was able to provide application with very low distortion and high-quality sound, but also has a high gain, fast conversion rate, wide bandwidth, large output voltage swing, large current capability and a very wide power rang of power and other characteristics. Peripheral structure of power amplifier is relatively simple; the power amplifier is divided into a front amplifier, tone control, intermediate amplification and after amplification. The power part is the dual power rectifier circuit, respectively two different output voltages to the power amplifier power supply.The design of the power amplifier can be used for home audio, stereo record player etc.

Keywords:Stereo Integrated power amplifier Amplifier

摘要 ............................................................. I Abstract .......................................................... I I 绪论 . (1)

1 音响技术的发展 (2)

1.1 音响 (2)

1.2 音响发展历史 (2)

1.3 家庭组合音响的种类 (3)

2 功率放大器与集成运放 (4)

2.1 功率放大器 (4)

2.2 集成运放 (8)

3 方案设计 (9)

3.1 整体电路设计框图 (9)

3.2 设计指标 (9)

3.3 方案选择 (9)

4 集成功放LM1875与NE5532简介 (11)

4.1 集成功放LM1875 (11)

4.2 集成功放NE5532 (13)

5 电路设计与工作原理 (15)

5.1 电路设计 (15)

5.2 电路工作原理 (17)

6 功放制作与测试 (18)

6.1 功放制作 (18)

6.2 测试及分析 (19)

参考文献 (21)

致谢 (22)

附录1 (23)

附录2 (24)