放大器是能把輸入訊號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、電視、自動控制等各種裝置中。

增加信號幅度或功率的裝置，它是自動化技術工具中處理信號的重要元件。放大器的放大作用是用輸入信號控制能源來實現的，放大所需功耗由能源提供。對于線性放大器，輸出就是輸入信號的復現和增強。

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