625A728G54 KOJ2-CPU

8263271

625A728G54 KOJ2-CPU

57C421A 57C-421A S-67108-2C

由于運算放大器的開環(huán)電壓放大倍數(shù)很高，當它工作在線性區(qū)時必須引入深度負反饋。因此，它的輸出與輸入之間的關(guān)系基本決定于反饋電路和輸入電路的結(jié)構(gòu)與參數(shù)，而與運放本身的參數(shù)關(guān)系不大。改變輸入電路和反饋電路的結(jié)構(gòu)和形式，就可以實現(xiàn)不同的運算。

　　負反饋的類型有：電壓串聯(lián)負反饋；電壓并聯(lián)負反饋；電流串聯(lián)負反饋；電流并聯(lián)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(lián)反饋；加在同一輸入端的是并聯(lián)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(wěn)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(lián)反饋使輸入電阻增高；并聯(lián)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。

聯(lián)系人：王工

電話：15506917382

座機：0591-62182535

QQ：583745937

傳真：0591-22989937

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