Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"差分放大電路圖" 
"        是由兩個性能相同或相近的三極管組成的對稱電路。Rc1、Rc2是集電極負載電阻，Re是兩管共用的發射極電阻，輸入信號加在兩管基極上，輸出信號取自兩管集電極。在理想情況下，輸出電壓總是為零。	" 
"         差模信號：加在差分兩管輸入端的大小相等，相位相反的信號，記作vid。" 
"         共模信號：差放兩輸入端所加的大小相等、相位相同的信號。記作vic。" 
"         差分放大器是用來放大差模信號的。" 
"         差分放大器的共模增益是越小越好，而差模增益是越大越好。在該電路中用恒流源I1代替電阻Re（在電源電壓一定的情況下，Re不能取得太大）。" 
"          傳輸特性：是指差分放大器在差模信號作用下，輸出電流隨輸入電壓的變化關系。" 
"        （1）差動放大電路輸出電壓的靜態調零：在靜態時Ic1=Ic2，Uo1=Uo2，通過調節調零電位器RW，使輸出電壓Uo=0；" 
"        （2）差動放大電路對差模信號起放大作用：當差動放大電路的兩輸入端加入大小相等、相位相反的差模信號，在兩邊放大器的輸出端就可得到大小相等、相位相反的一對輸出電壓Uo1和Uo2。對于雙端輸出的電路，輸出電壓Uo=Uo1-Uo2=2Uo1，為單邊輸出電壓（Uo=Uo1或Uo=Uo2）的兩倍；" 
"         （3）差動放大電路對共模信號起抑制作用：當差動放大電路的兩輸入端加入大小相等、相位相同的共模信號，在兩邊放大器的輸出端就可得到大小相等、相位相同的一對輸出電壓Uo1和Uo2。對于雙端輸出的差動放大電路，輸出電壓Uo=Uo1-Uo2=0。實際上兩邊放大器元件參數不可能完全對稱，在輸出端仍有一定的共模輸出電壓。公共射極電阻Re（或恒流源）對共模信號有強烈的電流負反饋作用，可進一步抑制共模信號。公共射極電阻Re越大，對共模信號抑制作用越強。但提高Re阻值會占有過多的直流壓降，影響放大電路的動態范圍，而恒流源占有的直流壓降不大，又具有很大的動態電阻，所以采用恒流源可進一步提高共模抑制比。" 
"" 
"公式：" 
"         雙端輸出的輸出電壓Uo為：Uo=Uo1-Uo2；" 
"         雙端輸出的差模電壓放大倍數為：Aud=Uo/Ui；" 
"         單端輸出的差模電壓放大倍數為：Aud1=Uo1/Ui  Aud2=Uo2/Ui；( 注意Uo1和Uo2相位相反)" 
"         雙端輸出和單端輸出的共模放大倍數為：Auc=(Uo1-Uo2)/Ui" 
"                                                                                 Auc1=Uo1/Ui          Auc2=Uo2/Ui；" 
"         共模抑制比為：雙端CMRR=Aud/Auc" 
"                                     單端CMRR1=Aud1/Aud2" 

EncryptionType: 2
UsingVectorGraphics: 0
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