56WK-P240/80-B

6SL3244-0BA10-0BA0

56WK-P240/80-B

CS1W-ID261

由于運算放大器的開環電壓放大倍數很高，當它工作在線性區時必須引入深度負反饋。因此，它的輸出與輸入之間的關系基本決定于反饋電路和輸入電路的結構與參數，而與運放本身的參數關系不大。改變輸入電路和反饋電路的結構和形式，就可以實現不同的運算。

　　負反饋的類型有：電壓串聯負反饋；電壓并聯負反饋；電流串聯負反饋；電流并聯負反饋。

　　反饋電路直接從輸出端引出的，是電壓反饋；從負載電阻靠近“地”端引出的，是電流反饋；（也可將輸出端短路，若反饋量為零，則為電壓反饋；若反饋量不為零，則為電流反饋。） 輸入信號和反饋信號分別加在兩個輸入端，是串聯反饋；加在同一輸入端的是并聯反饋；反饋信號使凈輸入信號減小的，是負反饋。

　　負反饋的對放大電路工作性能的影響：提高放大電路的穩定性；改善波形失真；

　　對輸入電阻和輸出電阻的影響：電壓反饋使輸出電阻降低；電流反饋使輸出電阻增高；串聯反饋使輸入電阻增高；并聯反饋使輸入電阻降低；

電子電路中的運算放大器，有同相輸入端和反相輸入端，輸入端的極性和輸出端是同一極性的就是同相放大器，而輸入端的極性和輸出端相反極性的則稱為反相放大器。

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