Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"共發射極放大器電路圖" 
"        Vbb是基極直流電源電壓，保證發射結加正向電壓（即正向偏置）。" 
"        Vcc是集電極直流電源電壓，保證集電結加反向電壓（即反向偏置）；并供給整個放大器的能源。" 
"         晶體管的放大作用是用輸入端的一個能量較小的信號通過晶體管產生一個能量較大的信號。輸出信號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加到集電結上；另一方面它又是負載電阻，把被晶體管放大了的集電極電流轉化為輸出電壓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到輸出端，保證放大器的直流工作狀態不受輸出端負載電壓R1的影響；另一方面又起著耦合交流的作用，保證交流信號能暢通地傳輸到輸出端。	" 
"       若在E極接入一電阻Re，隨著Re的增大，共發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載電阻。增大Rc可以有效地提高Av。但在實際電路中，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現。其二，在輸出電壓變化范圍內，為保證集電結反偏，晶體管工作在放大區，V（CEQ）必須大于（2~3）V。如圖中，假設集電極靜態工作點電流為ICQ，則" 
"        V（CEQ）=Vcc—ICQ*Rc" 
"當Vcc和ICQ一定時，要求V（CEQ）>(2~3）V，Rc的最大值就受到限制。" 
"        改進：用一個直流電阻很小，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成的有源負載電路代替。" 
"       共發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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