描述
按照不同的角度,放大器可以進(jìn)行不同類別的劃分。放大器按信號(hào)導(dǎo)通角的大小,可分為A、B、C、D、AB類,本文我們將一一進(jìn)行介紹。
A類放大器
純甲類放大器即末級(jí)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(hào)的整個(gè)周期內(nèi)均有電流流過(guò)晶體管(即導(dǎo)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(dá)到50%,通常只有30%~40%0在輸入信號(hào)的半個(gè)周期內(nèi)有電流流過(guò)晶體管(即導(dǎo)通角為1800),這種放大器被稱為B類放大器。由于導(dǎo)通角為1800,輸入信號(hào)的另半個(gè)周期波形被削掉,因此失真很大。
甲類功放(A類功放)輸出級(jí)中兩個(gè)(或兩組)晶體管永遠(yuǎn)處于導(dǎo)電狀態(tài),也就是說(shuō)不管有無(wú)信號(hào)輸入它們都保持傳導(dǎo)電流,并使這兩個(gè)電流等于交流電的峰值,這時(shí)交流在最大訊號(hào)情況下流入負(fù)載。當(dāng)無(wú)訊號(hào)時(shí),兩個(gè)晶體管各流通等量的電流,因此在輸出中心點(diǎn)上沒(méi)有不平衡的電流或電壓,故無(wú)電流輸入揚(yáng)聲器。當(dāng)訊號(hào)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(duì)減少電流,由于電流開(kāi)始不平衡,于是流入揚(yáng)聲器而且推動(dòng)揚(yáng)聲器發(fā)聲。簡(jiǎn)單來(lái)說(shuō),純甲類放大器永遠(yuǎn)工作在最大輸出功率狀態(tài)。
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主營(yíng)DCS系統(tǒng)配件
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