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7VUGX052AM01
6MBP80RTA060-01
ATS48D17Y
由于運(yùn)算放大器的開環(huán)電壓放大倍數(shù)很高，當(dāng)它工作在線性區(qū)時(shí)必須引入深度負(fù)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(yùn)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(shí)現(xiàn)不同的運(yùn)算。
負(fù)反饋的類型有：電壓串聯(lián)負(fù)反饋；電壓并聯(lián)負(fù)反饋；電流串聯(lián)負(fù)反饋；電流并聯(lián)負(fù)反饋。
反饋電路直接從輸出端引出的，是電壓反饋；從負(fù)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(hào)和反饋信號(hào)分別加在兩個(gè)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(hào)使凈輸入信號(hào)減小的，是負(fù)反饋。
負(fù)反饋的對(duì)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(duì)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(yùn)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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