摘要：在放大器领域中,经常需要进行不同频率的放大。当前，世界上正面临着一场新的技术革命，这场革命的重要基础之一就是放大技术。放大技术的发展给人类社会和国民经济的各个部门及各个领域带来了巨大的、广泛的、深刻的变化，带动着传统工业和其他新兴产业的更新和变革，是当今人类社会发展的强大动力。

　　　为了顺应全球音视频领域数字化的浪潮和人们对音视频设备节能环保的要求，分析了功率放大器的原理和红外无线遥控控制电路原理，结合单片机的优点和音量数字信号控制的特点，设计了红外遥控数字功率放大器。

　　　本设计是高精度数字控制放大器设计，使用高精度数字控制来控制，实现放大器的高精度和显示。具体应用89C51单片机为核心，红外实时测量，D/A转换器MAX541，芯片TPA3004D2的放大。本文从放大原理入手，阐述了放大系统的工作过程，以及硬件电路的设计、显示效果。本文吸收了硬件软件化的思想，实现了题目要求的功能。

关键词：放大，TPA3004D2，单片机，89C51，高精度

Abstract：In the field of amplifier, we often require amplification of different frequencies. At present, the world is facing a new technological revolution; one of the important foundations of the revolution is amplification technology. Amplification technology development to human society and all sectors of national economy and brought tremendous in all areas, extensive and profound changes, lead the traditional and other new industries to update and change, it is a strong driving force development of human society now.

　　In order to comply with the popularity of the audio-video digitization in the whole world and people requires to the saving energy and environment protection of the audio-video devices, this paper has analyses the controlling circuit principle of the power amplifier and infrared wireless remote controller, combined the advantage of the MCU and the features of the volume digital signal controller, then designed the power amplifier with infrared remote digital controller. 

　　　The design is the high-precision digital control amplifier design, using high-precision digital control to achieve high-precision amplifier and display. Specific application 89C51 microcontroller as core and infrared real-time measurement, D/A converter MAX541，the chip TPA3004D 2to amplify. Starting from the principle of amplification, elaborating the process of amplification system’s work ,the design and display of hardware circuit as well. The article absorbed the idea of hardware convert to software and achieves demand function of the subject.

Key words: enlarge, TPA3004D2, SCM, 89C51，precision