描述
A類放大器
純甲類放大器即末級放大管工作在甲類狀態(tài)的放大器，也叫純A類放大器。A類放大器在輸入信號的整個周期內(nèi)均有電流流過晶體管（即導通角為3600），這種放大器被稱為A類放大器。A類放大器的失真很小，但其效率也低，即使在理想情況下，最高效率也只能達到50%，通常只有30%~40%0在輸入信號的半個周期內(nèi)有電流流過晶體管（即導通角為1800），這種放大器被稱為B類放大器。由于導通角為1800，輸入信號的另半個周期波形被削掉，因此失真很大。
甲類功放（A類功放）輸出級中兩個（或兩組）晶體管永遠處于導電狀態(tài)，也就是說不管有無信號輸入它們都保持傳導電流，并使這兩個電流等于交流電的峰值，這時交流在最大訊號情況下流入負載。當無訊號時，兩個晶體管各流通等量的電流，因此在輸出中心點上沒有不平衡的電流或電壓，故無電流輸入揚聲器。當訊號趨向正極，線路上方的輸出晶體管容許流入較多的電流，下方的輸出晶體管則相對減少電流，由于電流開始不平衡，于是流入揚聲器而且推動揚聲器發(fā)聲。簡單來說，純甲類放大器永遠工作在最大輸出功率狀態(tài)。
B類放大器
由于晶體管起始導通電壓值的存在及起始導通的非線性，B類放大器存在著交越失真，這在高質(zhì)量的HI-FI放大領域顯然是不允許的。所以，常將推挽式電路的兩個晶體管均施加少量偏置，使其導通角略大于1800，可避免產(chǎn)生交越失真。這種電路，導通角介于A類和B類之間，稱為AB類（甲乙類）放大器oAB類電路的效率要低于B類，只有60%~70%。但因其兼顧了A類與B類的優(yōu)點（低失真、高效率），故目前得到了廣泛的應用。
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