FISHER-ROSEMOUNT DELTA V  KJ3225X1-BA1 Delta V Controller MD Module

FISHER-ROSEMOUNT DELTA V  KJ3225X1-BA1 Delta V Controller MD Module

FISHER-ROSEMOUNT DELTA V  KJ3225X1-BA1 Delta V Controller MD Module

基本放大電路的組成

　　上圖畫出共射極基本放大電路。它由三極管、電阻、電容和直流電源組成。

　　由于三極管基本放大電路的放大元件是半導體三極管，要使它具有放大作用，必須外加直流電源，并保證三極管的發(fā)射極有正向偏置電壓，集電結(jié)有反向偏置電壓。

　　另外，輸入信號和輸入電極之間有信號通路，輸出電極和負載之間有信號通路。

　　因為直流電源對交流信號呈現(xiàn)非常小（接近為0）的電阻，因此要避免交流信號與輸入、輸出電極相聯(lián)的信號被直流電源短路。所以直流電源和輸入、輸出電極之間接有足夠大的阻抗。

　　我們學習的三種基本放大電路的構(gòu)成，都具有上述特點。

　　2)．基本放大電路的工作特點：

　?。?）電路中既有直流，又有交流。直流提供靜態(tài)工作點，交流是被放大的信號；

　　（2）電路由線性元件和非線性元件組成，不能直接用線性電路的分析方法分析放大電路；

　?。?）三極管必須始終工作在放大狀態(tài)，以保證被放大的信號不失真。

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