摘要：在放大器領域中,經常需要進行不同頻率的放大。當前，世界上正面臨著一場新的技術革命，這場革命的重要基礎之一就是放大技術。放大技術的發展給人類社會和國民經濟的各個部門及各個領域帶來了巨大的、廣泛的、深刻的變化，帶動著傳統工業和其他新興產業的更新和變革，是當今人類社會發展的強大動力。

　　　為了順應全球音視頻領域數字化的浪潮和人們對音視頻設備節能環保的要求，分析了功率放大器的原理和紅外無線遙控控制電路原理，結合單片機的優點和音量數字信號控制的特點，設計了紅外遙控數字功率放大器。

　　　本設計是高精度數字控制放大器設計，使用高精度數字控制來控制，實現放大器的高精度和顯示。具體應用89C51單片機為核心，紅外實時測量，D/A轉換器MAX541，芯片TPA3004D2的放大。本文從放大原理入手，闡述了放大系統的工作過程，以及硬件電路的設計、顯示效果。本文吸收了硬件軟件化的思想，實現了題目要求的功能。

關鍵詞：放大，TPA3004D2，單片機，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