文档介绍：本科毕业论文(设计)
题目: 音频功率放大器设计
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专业: 电子信息工程
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二〇一三年五月
音频功率放大器设计
摘要:音频功放全称为音频功率放大器,它主要用于推动扬声器发声,从而重现声音的功放装置。本设计主要采用前置NE5532集成放大,功放模块选用LM1875放大芯片,电源部分采用自制的线性直流电源。该音频功率放大器能够很好的对低频小信号进行放大,它能够如实的反映出声音信号的音色,音高和音强等音质状况本来面貌的能力,并且对声音信号进行必要的修饰以及加工。本文主要介绍基于LM1875 D类音频功率放大电路的设计,它在音频应用场合能够提供非常低的失真度和高质量的音色,还具有了高增益、快速转换速率、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。在当今的社会中,经过了几代科学家的不断努力和尝试,它的技术已经日益成熟,用了一套比较完整的制作方法。通过对硬件数据进行测试,比较输出功率和输入功率,进一步了解了音频功率放大器。
关键词:LM1875;高保真;功率放大
Audio power amplifier design
Abstract:Audio amplifier called the audio power amplifier, it is mainly used to promote the sound from the speakers to reproduce sound amplifier device. The design front NE5532 integrated enlarge, rear LM1875 amplifier chip, can be a good low-frequency small-signal amplification, it can truthfully reflect the tone of the sound signal, pitch and tone strong sound quality status and the ability of the original appearance of and the sound signal necessary modification and processing Therefore, the object of study is the sound quality of high-fidelity power amplifier technology, this paper describes the LM1875 class D audio power amplifier design, audio applications can provide very low distortion and high-quality sound, but also has a high gain, fast slew rate, wide power bandwidth, large output voltage swing, high current capability, and a very wide power range and other characteristics. Today, the audio power amplifier is still analog amplifier for mainstream products, analog amplifier has experienced decades of continuous improvement and perfection, and its technology has been developed to its peak. Test, comparing the output power and input power, hardware data Learn more about the audio power amplifier.
Keywords: LM1875 ;High-fidelity ;power amplifier
目录
1. 绪论 1
音频功率放大器的设计背景 1
国内外的研究现状 2
设计的主要内容 3
2 系统方案的论证 4
设计的主要任务 4
设计方案的选择 4
3 硬件电路的设计 6
前置放大器 6
功放设计 7
功率放大器的类别 7
音频功率放大器的主要参数指标 10
D类功率放大器的特点 12