放大器是能把輸入訊號(hào)的電壓或功率放大的裝置，由電子管或晶體管、電源變壓器和其他電器元件組成。用在通訊、廣播、雷達(dá)、電視、自動(dòng)控制等各種裝置中。
增加信號(hào)幅度或功率的裝置，它是自動(dòng)化技術(shù)工具中處理信號(hào)的重要元件。放大器的放大作用是用輸入信號(hào)控制能源來(lái)實(shí)現(xiàn)的，放大所需功耗由能源提供。對(duì)于線(xiàn)性放大器，輸出就是輸入信號(hào)的復(fù)現(xiàn)和增強(qiáng)。
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