Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"共發(fā)射極放大器電路圖" 
"        Vbb是基極直流電源電壓，保證發(fā)射結(jié)加正向電壓（即正向偏置）。" 
"        Vcc是集電極直流電源電壓，保證集電結(jié)加反向電壓（即反向偏置）；并供給整個(gè)放大器的能源。" 
"         晶體管的放大作用是用輸入端的一個(gè)能量較小的信號(hào)通過晶體管產(chǎn)生一個(gè)能量較大的信號(hào)。輸出信號(hào)能量的來源是直流電源Vcc。" 
"        Rc是集電極電阻，一方面它形成集電極的直流通路，使集電極直流電源電壓通過Rc加到集電結(jié)上；另一方面它又是負(fù)載電阻，把被晶體管放大了的集電極電流轉(zhuǎn)化為輸出電壓vo，使放大器具有電壓（功率）放大的功能。" 
"        Cc是輸出端的耦合電容，它一方面起著隔直流的作用，使集電極的直流電壓不能傳輸?shù)捷敵龆耍ＷC放大器的直流工作狀態(tài)不受輸出端負(fù)載電壓R1的影響；另一方面又起著耦合交流的作用，保證交流信號(hào)能暢通地傳輸?shù)捷敵龆恕?" 
"       若在E極接入一電阻Re，隨著Re的增大，共發(fā)射極放大器的輸入和輸出電阻增大，而電壓增益下降。" 
"        Rc 既是直流通路中的集電極電阻，又是交流通路中的集電極交流負(fù)載電阻。增大Rc可以有效地提高Av。但在實(shí)際電路中，Rc的增大受到兩方面的限制：" 
"其一：大電阻在集成工藝中難以實(shí)現(xiàn)。其二，在輸出電壓變化范圍內(nèi)，為保證集電結(jié)反偏，晶體管工作在放大區(qū)，V（CEQ）必須大于（2~3）V。如圖中，假設(shè)集電極靜態(tài)工作點(diǎn)電流為ICQ，則" 
"        V（CEQ）=Vcc—ICQ*Rc" 
"當(dāng)Vcc和ICQ一定時(shí)，要求V（CEQ）>(2~3）V，Rc的最大值就受到限制。" 
"        改進(jìn)：用一個(gè)直流電阻很小，而交流電阻很大的電路，來取代Rc。可用施加恒定偏置電流的晶體三極管所構(gòu)成的有源負(fù)載電路代替。" 
"       共發(fā)射極電路的輸入和輸出電阻則居共基、共集電路之中。" 
"" 
"" 

EncryptionType: 2
UsingVectorGraphics: 0
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