描述
按照不同的角度，放大器可以进行不同类别的划分。放大器按信号导通角的大小，可分为A、B、C、D、AB类，本文我们将一一进行介绍。
A类放大器
纯甲类放大器即末级放大管工作在甲类状态的放大器，也叫纯A类放大器。A类放大器在输入信号的整个周期内均有电流流过晶体管（即导通角为3600），这种放大器被称为A类放大器。A类放大器的失真很小，但其效率也低，即使在理想情况下，最高效率也只能达到50%，通常只有30%~40%0在输入信号的半个周期内有电流流过晶体管（即导通角为1800），这种放大器被称为B类放大器。由于导通角为1800，输入信号的另半个周期波形被削掉，因此失真很大。
甲类功放（A类功放）输出级中两个（或两组）晶体管永远处于导电状态，也就是说不管有无信号输入它们都保持传导电流，并使这两个电流等于交流电的峰值，这时交流在最大讯号情况下流入负载。当无讯号时，两个晶体管各流通等量的电流，因此在输出中心点上没有不平衡的电流或电压，故无电流输入扬声器。当讯号趋向正极，线路上方的输出晶体管容许流入较多的电流，下方的输出晶体管则相对减少电流，由于电流开始不平衡，于是流入扬声器而且推动扬声器发声。简单来说，纯甲类放大器永远工作在最大输出功率状态。
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